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NCP5007 Compact Backlight LED Boost Driver
The NCP5007 is a high efficiency boost converter operating in a current control loop, based on a PFM mode, to drive White LEDs. The current mode regulation allows a uniform brightness of the LEDs. The chip has been optimized for small ceramic capacitors and is capable of supplying up to 1.0 W output power.
Features http://onsemi.com MARKING DIAGRAM
TSOP-5 (SOT23-5, SCR59-5) SN SUFFIX CASE 483 1 5 DCLAYWG G 1
* * * * * * * * * * * *
Inductor Based Converter brings High Efficiency Constant Output Current Regulation 2.7 to 5.5 V Input Voltage Range Vout to 22 V Output Compliance Allows up to 5 LEDs to be Driven in Series which Provides Automatic LED Current Matching Built-in Output Overvoltage Protection 0.3 mA Standby Quiescent Current Includes Dimming Function (PWM) Enable Function Driven Directly from Low Battery Voltage Source Thermal Shutdown Protection All Pins are Fully ESD Protected Low EMI Radiation Pb-Free Package is Available
5
DCL = Device Code A = Assembly Location Y = Year W = Work Week G = Pb-Free Package (Note: Microdot may be in either location)
PIN CONNECTIONS
FB GND EN 1 2 3 (Top View) 4 Vout 5 Vbat
Typical Applications
* LED Display Back Light Control * High Efficiency Step Up Converter
Vbat U1 3 EN Vbat 5
Vbat C1 4.7 mF L1 22 mH 2 1 Vout 4 D1 MBR0530 C2 1.0 mF GND
ORDERING INFORMATION
Device NCP5007SNT1 NCP5007SNT1G Package TSOP-5 TSOP-5 (Pb-Free) Shipping 3000/Tape & Reel 3000/Tape & Reel
GND
GND FB NCP5007
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
R1 GND 5.6 W
D6
D5
D4
D3
D2 GND
Figure 1. Typical Application
(c) Semiconductor Components Industries, LLC, 2006
1
March, 2006 - Rev. 4
Publication Order Number: NCP5007/D
NCP5007
Thermal Shutdown
Current Sense
Vbat
Vsense
5
Vbat
4 EN 3 100 k
Vout
CONTROLLER
GND
Q1
FB
1 300 k +200 mV
- + GND
2
GND
Band Gap
Figure 2. Block Diagram
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NCP5007
PIN FUNCTION DESCRIPTION
Pin 1 Symbol FB Type ANALOG INPUT Description This pin provides the output current range adjustment by means of a sense resistor connected to the analog control or with a PWM control. The dimming function can be achieved by applying a PWM voltage technique to this pin (see Figure 29). The current output tolerance depends upon the accuracy of this resistor. Using a "5% metal film resistor, or better, yields good output current accuracy. Note: A built-in comparator switches OFF the DC-DC converter if the voltage sensed across this pin and ground is higher than 700 mV typical. This pin is the system ground for the NCP5007 and carries both the power and the analog signals. High quality ground must be provided to avoid spikes and/or uncontrolled operation. Care must be observed to avoid high-density current flow in a limited PCB copper track so a robust ground plane connection is recommended. This is an Active-High logic input which enables the boost converter. The built-in pulldown resistor disables the device when the EN pin is left open. Note the logic switching level of this input has been optimized to allow it to be driven from standard or 1.8 V CMOS logic levels. The LED brightness can be controlled by applying a pulse width modulated signal to the enable pin (see Figure 30). This pin is the power side of the external inductor and must be connected to the external Schottky diode. It provides the output current to the load. Since the boost converter operates in a current loop mode, the output voltage can range up to +22 V but shall not exceed this limit. However, if the voltage on this pin is higher than the OVP threshold (Over Voltage Protection) the device enters a shutdown mode. To restart the chip, one must either apply a low to high logic signal to the EN pin, or switch off the Vbat supply. A capacitor must be used on Vout to avoid false triggering of the OVP (Overvoltage Protect) circuit. This capacitor filters the noise created by the fast switching transients. In order to limit the inrush current and still have acceptable startup time the capacitor value should range between 1.0 mF and 8.2 mF max. To achieve high efficiency this capacitor should be ceramic (ESR t 100 mW). Care must be observed to avoid EMI through the PCB copper tracks connected to this pin. 5 Vbat POWER The external voltage supply is connected to this pin. A high quality reservoir capacitor must be connected across pin 5 and Ground to achieve the specified output voltage parameters. A 4.7 mF/6.3 V, low ESR capacitor must be connected as close as possible across pin 5 and ground pin 2. The X5R or X7R ceramic MURATA types are recommended. The return side of the external inductor shall be connected to this pin. Typical application will use a 22 mH, size 1210, to handle the 10 to 100 mA output current range. When the desired output current is above 20 mA, the inductor shall have an ESR v1.5 W to achieve good efficiency over the Vbat range. The output current tolerance can be improved by using a larger inductor value.
2
GND
POWER
3
EN
DIGITAL INPUT
4
Vout
POWER
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NCP5007
MAXIMUM RATINGS
Rating Power Supply Output Power Supply Voltage Compliance Digital Input Voltage Digital Input Current ESD Capability (Note 1) Human Body Model (HBM) Machine Model (MM) TSOP5 Package Power Dissipation @ TA = +85C (Note 2) Thermal Resistance, Junction-to-Air Operating Ambient Temperature Range Operating Junction Temperature Range Maximum Junction Temperature Storage Temperature Range Symbol Vbat Vout EN VESD 2.0 200 PD RqJA TA TJ TJmax Tstg 160 250 -25 to +85 -25 to +125 +150 -65 to +150 kV V mW C/W C C C C Value 6.0 28 -0.3 v Vin v Vbat +0.3 1.0 Unit V V V mA
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. This device series contains ESD protection and exceeds the following tests: Human Body Model (HBM) "2.0 kV per JEDEC standard: JESD22-A114 Machine Model (MM) "200 V per JEDEC standard: JESD22-A115 2. The maximum package power dissipation limit must not be exceeded. 3. Latchup current maximum rating: "100 mA per JEDEC standard: JESD78. 4. Moisture Sensivity Level (MSL): 1 per IPC/JEDEC standard: J-STD-020A.
POWER SUPPLY SECTION (Typical values are referenced to Ta = +25C, Min & Max values are referenced -25C to +85C ambient
temperature, unless otherwise noted.) Rating Power Supply Output Load Voltage Compliance Continuous DC Current in the Load @ Vout = 3 LED, L = 22 mH, ESR < 1.5 W, Vbat = 3.6 V Standby Current @ Iout = 0 mA, EN = L, Vbat = 3.6 V Standby Current @ Iout = 0 mA, EN = L, Vbat = 5.5 V Inductor Discharging Time @ Vbat = 3.6 V, L = 22 mH, 3 Iout = 10 mA Thermal Shutdown Protection Thermal Shutdown Protection Hysteresis LED, Pin 4 5 5 4 4 4 - - Symbol Vbat Vout Iout Istdb Istdb Toffmax TSD TSDH Min 2.7 22 50 - - - - - Typ - 24.5 - 0.45 1.0 320 160 30 Max 5.5 - - - 3.0 - - - Unit V V mA mA mA ns C C
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NCP5007
ANALOG SECTION (Typical values are referenced to Ta = +25C, Min & Max values are referenced -25C to +85C ambient temperature, unless otherwise noted.)
Rating High Level Input Voltage Low Level Input Voltage EN Pull Down Resistor Feedback Voltage Threshold Output Current Stabilizes @ 5% time delay following a DC-DC startup @ Vbat = 3.6 V, L = 22 mH, Iout = 20 mA Internal Switch ON Resistor @ Tamb = +25C Pin 1 1 4 5 5 Symbol EN REN FB Ioutdly QRDSON Min 1.3 - - 170 - - Typ - - 100 200 100 1.7 Max - 0.4 - 230 - - Unit V kW mV ms W
5. The overall tolerance depends upon the accuracy of the external resistor.
THEORY OF OPERATION The DC-DC converter is designed to supply a constant current to the external load, the circuit being powered from a standard battery supply. Since the regulation is made by means of a current loop, the output voltage will vary depending upon the dynamic impedance presented by the load.
Considering a high intensity LED, the output voltage can range from a low of 6.4 V (two LED in series biased with a low current), up to 22 V, the maximum the chip can sustain continuously. The basic DC-DC structure is depicted in Figure 3. With a 22 V operating voltage capability, the power device Q1 can accommodate a high voltage source without any leakage current degradation.
Vbat L1 22 mH
POR
Vdsense 4 D1 Q1 Vds
1.0 mF C2 GND 1
TIME_OUT ZERO_CROSSING RESET GND
LOGIC CONTROL
Vdsense
+ - V(Ipeak) - + C2
R1
R2 xR
D5 Vs GND
Vref GND
Figure 3. Basic DC-DC Converter Structure
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D4
D3
D2
NCP5007
Basically, the chip operates with two cycles: Cycle #1 : time t1, the energy is stored into the inductor Cycle #2 : time t2, the energy is dumped to the load The POR signal sets the flip-flop and the first cycle takes place. When the current hits the peak value, defined by the error amplifier associated with the loop regulation, the flip-flop resets, the NMOS is deactivated and the current is dumped into the load. Since the timing is application dependent, the internal timer limits the Toff cycle to 320 ns (typical), making sure the system operates in a continuous mode to maximize the energy transfer.
First Startup
Normal Operation Ipeak
IL 0 mA t1 t2 t
Iv
Ids 0 mA
t
Io 0 mA t
Figure 4. Basic DC-DC Operation
Based on the data sheet, the current flowing into the inductor is bounded by two limits: * Ipeak Value: Internally fixed to 350 mA typical * Iv Value: Limited by the fixed Toff time built in the chip (320 ns typical) The system operates in a continuous mode as depicted in Figure 4 and t1 & t2 times can be derived from basic equations. (Note: The equations are for theoretical analysis only, they do not include the losses.)
E + L * di dt
(eq. 1)
Of course, from a practical stand point, the inductor must be sized to cope with the peak current present in the circuit to avoid saturation of the core. On top of that, the ferrite material shall be capable to operate at high frequency (1.0 MHz) to minimize the Foucault's losses developed during the cycles. The operating frequency can be derived from the electrical parameters. Let V = Vo - Vbat, rearranging Equation 1:
ton + dI * L E
(eq. 5)
Let E = Vbat, then:
t1 + (Ip * Iv) * L Vbat
(eq. 2)
Since toff is nearly constant (according to the 320 ns typical time), the dI is constant for a given load and inductance value. Rearranging Equation 5 yields:
ton +
V*dt L
(Ip * Iv) * L t2 + Vo * Vbat
(eq. 3)
*L E
(eq. 6)
Since t2 = 320 ns typical and Vo = 22 V maximum, then (assuming a typical Vbat = 3.0 V):
t2 * (Vo * Vbat) DI + L DImax + 320e * 9 * (22 * 3.0) + 276 mA 22e * 6
(eq. 4)
Let E = Vbat, and Vopk = output peak voltage, then:
ton + (Vopk * Vbat) * dt Vbat
(eq. 7)
Finally, the operating frequency is:
F+ 1 ton ) toff
(eq. 8)
The output power supplied by the NCP5007 is limited to one watt: Figure 5 shows the maximum power that can be delivered by the chip as a function of the input voltage.
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NCP5007
1200 3 LED 1000 800 Pout (mW) 600 400 200 Pout = f(Vbat) @ Rsense = 2.0 W 0 2 3 4 Vbat (V) 5 6 150 2 3 4 Vbat (V) Test conditions: 5 LEDs in series, steady state operation 5 6 200 5 LED 2 LED Ipeak (mA) 4 LED 350 400 L = 22H Rsense = 10W TA = +25C
300
250
Figure 5. Maximum Output Power as a Function of the Battery Supply Voltage
Figure 6. Typical Inductor Peak Current as a Function of Vbat Voltage
120 100 80 Iout (mA) 4 LED 60 5 LED 40 20 0 2.5 2 LED 3 LED
3.0
3.5
4.0 Vbat (V)
4.5
5.0
5.5
Test conditions: L = 22 mH, Rsense = 2.0 W, Tamb = +25C
Figure 7. Maximum Output Current as a Function of Vbat
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NCP5007
Output Current Range Set-Up
The current regulation is achieved by means of an external sense resistor connected in series with the LED string.
Vbat L1 22 mH Vout 4 D1
FB 1
Q1
CONTROLLER
GND R1 xW
GND
Figure 8. Output Current Feedback
The current flowing through the LED creates a voltage drop across the sense resistor R1. The voltage drop is constantly monitored internally, and maximum peak current allowed in the inductor is set accordingly in order to keep constant this voltage drop (and thus the current flowing through the LED). For example, should one need a 10 mA output current, the sense resistor should be sized according to the following equation:
R1 + Feedback Threshold + 200 mV + 20 W Iout 10 mA
Load
(eq. 9)
A standard 5% tolerance resistor, 22 W SMD device, yields 9.09 mA, good enough to fulfill the back light demand. The typical application schematic diagram is provided in Figure 9.
Vbat U1 Pulse 3 EN Vbat 5 C1 4.7 mF L1 22 mH 2 1 Vout 4 D1 MBR0530 C2 1.0 mF GND
GND
GND FB NCP5007
R1 GND 22 W
D6 LED
D5 LED
D4 LED
D3 LED
D2 GND LED
Figure 9. Basic Schematic Diagram
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NCP5007
Output Load Drive
In order to take advantage of the built-in Boost capabilities, one shall operate the NCP5007 in the continuous output current mode. Such a mode is achieved by using and external reservoir capacitor (see Table 1) across the LED. At this point, the peak current flowing into the LED diodes shall be within the maximum ratings specified for these devices. Of course, pulsed operation can be achieved, thanks to the EN signal pin 3, to force high current into the LED when necessary.
The Schottky diode D1, associated with capacitor C2 (see Figure 9), provides a rectification and filtering function. When a pulse-operating mode is required: * A PWM mode control can be used to adjust the output current range by means of a resistor and a capacitor connected across FB pin. On the other hand, the Schottky diode can be removed and replaced by at least one LED diode, keeping in mind such LED shall sustain the large pulsed peak current during the operation.
TYPICAL OPERATING CHARACTERISTICS
100 90 80 EFFICIENCY (%) EFFICIENCY (%) 70 60 50 40 30 20 10 0 2.50 3.00 3.50 4.00 Vbat (V) 4.50 5.00 5.50 5 LED/4 mA 3 LED/4 mA 2 LED/4 mA 4 LED/4 mA 100 90 80 70 60 50 40 30 20 10 0 2.50 3.00 3.50 4.00 Vbat (V) 4.50 5.00 5.50 2 LED/10 mA 5 LED/10 mA 3 LED/10 mA
4 LED/10 mA
Figure 10. Overall Efficiency vs. Power Supply - Iout = 4.0 mA, L = 22 mH
100 90 80 EFFICIENCY (%) 5 LED/15 mA 4 LED/15 mA EFFICIENCY (%) 70 60 50 40 30 20 10 0 2.50 3.00 3.50 4.00 Vbat (V) 4.50 5.00 5.50 2 LED/15 mA 100 90 80 70 60 50 40 30 20 10
Figure 11. Overall Efficiency vs. Power Supply - Iout = 10 mA, L = 22 mH
3 LED/15 mA
3 LED/20 mA
4 LED/20 mA
5 LED/20 mA
2 LED/20 mA
0 2.50
3.00
3.50
4.00 Vbat (V)
4.50
5.00
5.50
Figure 12. Overall Efficiency vs. Power Supply - Iout = 15 mA, L = 22 mH
Figure 13. Overall Efficiency vs. Power Supply - Iout = 20 mA, L = 22 mH
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NCP5007
TYPICAL OPERATING CHARACTERISTICS
(All curve conditions: L = 22 mH, Cin = 4.7 mF, Cout = 1.0 mF, Typical curve @ Ta = +25C) 100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 2.50 3.00 3.50 4.00 Vbat (V) 4.50 5.00 5.50 0 2.5 3.0 3.5 4.0 VBAT (V) 4.5 3 LED/40 mA 4 LED/40 mA 5 LED/40 mA IOUT (mA) 2 LED/40 mA 25 20 15 10 5 IOUT = 20 mA Nom 30
IOUT = 10 mA Nom L = 22 mH TA = 25C 5.0 5.5
Figure 14. Overall Efficiency vs. Power Supply - Iout = 40 mA, L = 22 mH
25 IOUT = 20 mA Nom 20
Figure 15. Current Variation vs. Power Supply with 3 Series LED's
25 IOUT = 20 mA Nom 20
IOUT (mA)
15
IOUT (mA) IOUT = 10 mA Nom
15
10
10 IOUT = 10 mA Nom
5
L = 22 mH TA = 25C 3.0 3.5 4.0 VBAT (V) 4.5 5.0 5.5
5
L = 22 mH TA = 25C 3.0 3.5 4.0 VBAT (V) 4.5 5.0 5.5
0 2.5
0 2.5
Figure 16. Current Variation vs. Power Supply with 4 Series LED's
205 204 FEEDBACK VOLTAGE (mV) 203 202 201 200 199 198 197 196 195 -40 -20 0 20 40 60 80 100 Vbat = 3.1 V thru 5.5 V FEEDBACK VARIATION (%)
Figure 17. Current Variation vs. Power Supply with 5 Series LED's
5 4 3 2 1 0 -1 -2 -3 -4 -5 -40 -20 0 20 40 60 80 100 Vbat = 3.1V thru 5.5V
TEMPERATURE (C)
TEMPERATURE (C)
Figure 18. Feedback Voltage Stability
Figure 19. Feedback Voltage Variation
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NCP5007
TYPICAL OPERATING CHARACTERISTICS
(All curve conditions: L = 22 mH, Cin = 4.7 mF, Cout = 1.0 mF, Typical curve @ Ta = +25C) 1.4 -40C thru 125C 1.2 1.0 IStby (A) 0.8 0.6 0.4 0.5 0.2 0.0 2.7 3.3 3.9 4.5 5.1 5.5 0 2.5 F (mHz) 1.5 3 LED 4 LED 5 LED 2.0 2 LED 2.5
1.0
3.0
3.5
4.0 Vbat (V)
4.5
5.0
5.5
Vbat, BATTERY VOLTAGE (V)
Figure 20. Standby Current
Figure 21. Typical Operating Frequency
26 OVER VOLTAGE PROTECTION (V)
25
Vbat = 2.7V Vbat = 5.5V
Vbat = 3.6V
24
23
22 -40 -20
0
20
40
60
80
100
120 130
TEMPERATURE(C)
Figure 22. Overvoltage Protection
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NCP5007
TYPICAL OPERATING WAVEFORMS
Vout
Inductor Current
Conditions: Vbat = 3.6 V, Lout = 22 mH, 5 LED, Iout = 15 mA
Figure 23. Typical Power Up Response
Vout
Inductor Current
Conditions: Vbat = 3.6 V, Lout = 22 mH, 5 LED, Iout = 15 mA
Figure 24. Typical Startup Inductor Current and Output Voltage
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NCP5007
TYPICAL OPERATING WAVEFORMS
Inductor Current
Conditions: Vbat = 3.6 V, Lout = 22 mH, 5 LED, Iout = 15 mA
Figure 25. Typical Inductor Current
Vout Ripple 50 mV/div
Inductor Current
Conditions: Vbat = 3.6 V, Lout = 22 mH, 5 LED, Iout = 15 mA
Figure 26. Typical Output Voltage Ripple
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NCP5007
TYPICAL OPERATING WAVEFORMS
Output Voltage
Inductor Current
Test Conditions: L = 22 mH, Iout = 15 mA, Vbat = 3.6 V, Ambient Temperature, LED = 5
Figure 27. Typical Output Peak Voltage
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NCP5007
TYPICAL APPLICATIONS CIRCUITS
Standard Feedback
The standard feedback provides constant current to the LEDs, independently of the Vbat supply and number of
Vbat U1 3 EN Vbat 5
LEDs in series. Figure 28 depicts a typical application to supply 13 mA to the load.
Vbat
C1 4.7 mF L1 22 mH GND D1 MBR0530 C2 1.0 mF D4 LED D3 LED D2 LED GND
GND
2 1
GND FB
Vout 4
NCP5007
R1 GND 15 W
D6 LED
D5 LED
Figure 28. Basic DC Current Mode Operation with Analog Feedback PWM Operation
The analog feedback pin 1 provides a way to dim the LED by means of an external PWM signal as depicted in Figure 29. Taking advantage of the high internal impedance presented by the FB pin, one can set up a simple R/C network to accommodate such a dimming function. Two modes of operation can be considered: * Pulsed mode, with no filtering * Averaged mode with filtering capacitor
Although the pulsed mode will provide a good dimming function, it will yield high switching transients which are difficult to filter out in the control loop. As such this first approach is not recommended. The output current depends upon the duty cycle of the signal presented to the node pin 1: this is very similar to the digital control shown in Figure 30. The average mode yields a noise-free operation since the converter operates continuously, together with a very good dimming function. The cost is an extra resistor and one extra capacitor, both being low cost parts.
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NCP5007
Vbat U1 3 EN Vbat 5 4.7 mF Vbat C1
L1 22 mH Average Network GND R2 PWM 150 k 10 k C3 100 nF R4 5.6 k R3 2 1 GND FB NCP5007 Vout 4
D1 MBR0530
GND
C2 1.0 mF
GND GND GND 10 W NOTE: RC filter R2 and C3 is optional (see text) LED Sense Resistor LED LED LED LED R1 D6 D5 D4 D3 D2
Figure 29. Basic DC Current Mode Operation with PWM Control
To implement such a function, lets consider the feedback input as an operational amplifier with a high impedance input (reference schematic Figure 29). The analog loop will keep going to balance the current flowing through the sense resistor R1 until the feedback voltage is 200 mV. An extra resistor (R4) isolates the FB node from low resistance to ground, making possible to add an external voltage to this pin. The time constant R2/C3 generates the voltage across C3, added to the node pin 1, while R2/R3/R4/R1/C3 create the discharge time constant. In order to minimize the pick up noise at FB node, the resistors shall have relative medium value, preferably well below 1.0 MW. Consequently, let R2 = 150 k, R3 = 10 k and R4 = 5.6 k. In addition, the feedback delay to control the luminosity of the LED shall be acceptable by the user, 10 ms or less being a good
U1 Pulse 3 EN Vbat 5
compromise. The time constant can now be calculated based on a 400 mV offset voltage at the C3/R2/R3 node to force zero current to the LED. Assuming the PWM signal comes from a standard gate powered by a 3.0 V supply, running at 5.0 kHz, then full dimming of the LED can be achieved with a 95% span of the Duty Cycle signal.
Digital Control
An alternative method of controlling the luminosity of the LEDs is to apply a PWM signal to the EN pin (see Figure 30). The output current depends upon the Duty Cycle, but care must be observed as the DC-DC converter is continuously pulsed ON/OFF and noise is likely to be generated.
Vbat C1 4.7 mF L1 22 mH GND D1 MBR0530 C2 1.0 mF D4 D3 D2 GND
GND
2 1
GND FB
Vout 4
NCP5007
R1 GND 5.6 W
D6
D5
NOTE: Pulse width and frequency depends upon the application constraints.
Figure 30. Typical Semi-Pulsed Mode of Operation
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NCP5007
Typical LEDs Load Mapping
Since the output power is battery limited (see Figure 5), one can arrange the LEDs in a variety of different
configurations. Powering ten LEDs can be achieved by a series/parallel combination as depicted in Figure 31.
50 mA Load D1 LED D5 LED Load
75 mA D1 LED D3 LED D5 LED D7 LED D9 LED
D2 LED 14 V (Typ.)
D6 LED
7.0 V (Typ.)
D2 LED
D4 LED
D6 LED
D8 LED
D10 LED
D3 LED
D7 LED
Sense Resistor
R1 2.7 W
D4 LED
D8 LED 60 mA
GND Load D1 LED 10.5 V (Typ.) D4 LED D7 LED D10 LED D13 LED
Sense Resistor
R1 3.9 W
GND
D2 LED
D5 LED
D8 LED
D11 LED
D14 LED
Test conditions: Vbat = 3.6 V Lout = 22 mH Cout = 1.0 mF
D3 LED
D6 LED
D9 LED
D12 LED
D15 LED
Sense Resistor
R1 3.3 W
GND
Figure 31. Examples of Possible LED Arrangements
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NCP5007
ON Semiconductor provides a demo board to evaluate the performance of the NCP5007. The schematic for that demo board is illustrated in Figure 32.
TP3 Vbat Vbat S2 SELECT 3 2 1 GND 3 2 1 3 R3 10 k U1 EN Vbat 5 TP1 Vout 4.7 mF/10 V GND JP1 ISense Vbat C1
S1 MANUAL
L1 22 mH 2
GND S3 BRIGHTNESS 3 2 1 R2 10 k R5 0R
GND Vout 4
D1
1
FB NCP5007
MBR0530 C3 GND
MODULATION R1 J3 150 k
Jumper = 0 W TP2 FB
GND
J2 Vbat 2 1 PWR J1 1 2 Vbat GND
C2 100 nF R10 Z1 GND 10 R
R4 5.6 k D6 LED D5 LED D4 LED D3 LED D2 LED
Figure 32. NCP5007 Demo Board Schematic Diagram
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NCP5007
Table 1. Recommended External Parts
Part 30 V Low Vf Schottky Diode 20 V Low Vf Schottky Diode 20 V Low Vf Schottky Diode Ceramic Cap. 1.0 mF/16 V Ceramic Cap. 4.7 mF/6.3 V Inductor 22 mH Inductor 22 mH Manufacturer ON Semiconductor ON Semiconductor ON Semiconductor MURATA MURATA CoilCraft CoilCraft Description SOD-123 (1.6 x 3.2 mm) SOD-323 (1.25 x 2.5 mm) SOD-563 (1.6 x 1.6 mm) GRM42-X7R GRM40-X5R 1008PS-Shielded Power Wafer Part Number MBR0530T1 NSR0320MW2T1 NSR0320XV6T1 GRM42-6X7R-105K16 GRM40-X5R-475K6.3 1008PS-223MC LPQ4812-223KXC
Figure 33. NCP5007 Demo Board PCB: Top Layer
Figure 34. NCP5007 Demo Board Top Silkscreen
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NCP5007
FIGURES INDEX Figure 1: Figure 2: Figure 3: Figure 4: Figure 5: Figure 6: Figure 7: Figure 8: Figure 9: Figure 10: Figure 11: Figure 12: Figure 13: Figure 14: Figure 15: Figure 16: Figure 17: Figure 18: Figure 19: Figure 23: Figure 24: Figure 25: Figure 26: Figure 27: Figure 28: Figure 29: Figure 30: Figure 31: Figure 32: Figure 33: Figure 34: Typical Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Basic DC-DC Converter Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Basic DC-DC Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Maximum Output Power as a Function of the Battery Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical Inductor Peak Current as a Function of Vbat Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Maximum Output Current as a Function of Vbat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Output Current Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Basic Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Overall Efficiency vs. Power Supply - Iout = 4.0 mA, L = 22 mH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Overall Efficiency vs. Power Supply - Iout = 10 mA, L = 22 mH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Overall Efficiency vs. Power Supply - Iout = 15 mA, L = 22 mH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Overall Efficiency vs. Power Supply - Iout = 20 mA, L = 22 mH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Overall Efficiency vs. Power Supply - Iout = 40 mA, L = 22 mH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Feedback Voltage Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Feedback Voltage Variation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Standby Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Typical Operating Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Overvoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Typical Power Up Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Typical Startup Inductor Current and Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Typical Inductor Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Typical Output Voltage Ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Typical Output Peak Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Basic DC Current Mode Operation with Analog Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Basic DC Current Mode Operation with PWM Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Typical Semi-Pulsed Mode of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Examples of Possible LED Arrangements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 NCP5007 Demo Board Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 NCP5007 Demo Board PCB: Top Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 NCP5007 Demo Board Top Silkscreen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
NOTE CAPTIONS INDEX Note 1: Note 2: Note 3: Note 4: Note 5: This device series contains ESD protection and exceeds the following tests . . . . . . . . . . . . . . . . . . . . . . . . . . The maximum package power dissipation limit must not be exceeded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Latchup current maximum rating: "100 mA per JEDEC standard: JESD78 . . . . . . . . . . . . . . . . . . . . . . . . . Moisture Sensivity Level (MSL): 1 per IPC/JEDEC standard: J-STD-020A . . . . . . . . . . . . . . . . . . . . . . . . . The overall tolerance depends upon the accuracy of the external resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 4 4 5
ABBREVIATIONS EN FB POR Enable Feed Back Power On Reset: Internal pulse to reset the chip when the power supply is applied
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NCP5007
PACKAGE DIMENSIONS
TSOP-5 SN SUFFIX CASE 483-02 ISSUE C
D
5 1 2 4 3
S
B
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS. MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL. 4. A AND B DIMENSIONS DO NOT INCLUDE MOLD FLASH, PROTRUSIONS, OR GATE BURRS. MILLIMETERS INCHES DIM MIN MAX MIN MAX A 2.90 3.10 0.1142 0.1220 B 1.30 1.70 0.0512 0.0669 C 0.90 1.10 0.0354 0.0433 D 0.25 0.50 0.0098 0.0197 G 0.85 1.05 0.0335 0.0413 H 0.013 0.100 0.0005 0.0040 J 0.10 0.26 0.0040 0.0102 K 0.20 0.60 0.0079 0.0236 L 1.25 1.55 0.0493 0.0610 M 0_ 10 _ 0_ 10 _ S 2.50 3.00 0.0985 0.1181
L G A J C 0.05 (0.002) H K M
SOLDERING FOOTPRINT*
1.9 0.074
0.95 0.037
2.4 0.094 1.0 0.039 0.7 0.028
SCALE 10:1
mm inches
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT: N. American Technical Support: 800-282-9855 Toll Free Literature Distribution Center for ON Semiconductor USA/Canada P.O. Box 61312, Phoenix, Arizona 85082-1312 USA Phone: 480-829-7710 or 800-344-3860 Toll Free USA/Canada Japan: ON Semiconductor, Japan Customer Focus Center 2-9-1 Kamimeguro, Meguro-ku, Tokyo, Japan 153-0051 Fax: 480-829-7709 or 800-344-3867 Toll Free USA/Canada Phone: 81-3-5773-3850 Email: orderlit@onsemi.com ON Semiconductor Website: http://onsemi.com Order Literature: http://www.onsemi.com/litorder For additional information, please contact your local Sales Representative.
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21
NCP5007/D

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