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CAT4103
3-Channel Constant-Current RGB LED Driver
FEATURES
3 independent current sinks rated to 25V LED current to 175mA per channel set by separate external resistors High-speed 25MHz 4-wire serial interface Buffered output drivers to ensure data integrity Cascadable devices Low dropout current source (0.4V at 175mA) 3V to 5.5V logic supply Thermal shutdown protection RoHS-compliant 16-lead SOIC package
DESCRIPTION
The CAT4103 is a 3-channel, linear based constantcurrent LED driver designed for RGB LED control, requiring no inductor and provides a low noise operation. LED channel currents up to 175mA are programmed independently via separate external resistors. Low output voltage operation of 0.4V at 175mA allows for more power efficient designs across wider supply voltage range. The three LED pins are compatible with high voltage up to 25V supporting applications with long strings of LEDs. A high-speed 4-wire 25MHz serial interface controls each individual channel using a shift register and latch configuration. Output data pins allow multiple devices to be cascaded and programmed via one serial interface with no need for external drivers or timing considerations. The device also includes a blanking control pin (BIN) that can be used to disable all channels independently of the interface. Thermal shutdown protection is incorporated in the device to disable the LED outputs whenever the die temperature exceeds 150C. The device is available in a 16-lead SOIC package.
APPLICATIONS
Multi-color, intelligent LED, architectural lighting High-visual impact LED signs and displays LCD backlight
ORDERING INFORMATION
Part Number CAT4103V-GT2 Package SOIC-16* Quantity per Reel 2,000 Package Marking CAT4103V
* Lead Finish NiPdAu
PIN CONFIGURATION
16-Lead SOIC (W) Top View
TYPICAL APPLICATION CIRCUIT
VIN 5V to 25V
GND BIN LIN SIN CIN RSET3 RSET2 RSET1
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VDD BOUT
VDD 3V to 5.5V
C1 1F VDD
RED LED1
GREEN LED2
BLUE LED3 BOUT
LOUT SOUT COUT LED1 LED2 LED3
CONTROLLER
BIN LIN SIN CIN GND RSET1 R1 RSET2 R2
CAT4103
LOUT SOUT COUT RSET3 R3
NEXT CAT4103 DEVICE
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
1
Doc. No. MD-5038, Rev. A
CAT4103 ABSOLUTE MAXIMUM RATINGS
Parameter VDD Voltage Input Voltage Range (SIN, BIN, CIN, LIN) Output voltage range (SOUT, BOUT, COUT, LOUT) LED1, LED2, LED3 Voltage DC Output Current on LED1 to LED3 Storage Temperature Range Junction Temperature Range Lead Soldering Temperature (10sec.) ESD Rating: All Pins Human Body Model Machine Model Rating 6 -0.3V to VDD+0.3V -0.3V to VDD+0.3V 25 200 -55 to +160 -40 to +150 300 2000 200 Units V V V V mA C C C V
RECOMMENDED OPERATING CONDITIONS
Parameter VDD Voltage applied to LED1 to LED3, outputs off Voltage applied to LED1 to LED3, outputs on Output Current on LED1 to LED3 Ambient Temperature Range Range 3.0 to 5.5 up to 25 up to 6* 2 to 175 -40 to +85 Units V V V mA C
* Keeping the LEDx pin voltage below 6V in operation is recommended to minimize thermal dissipation in the package.
ELECTRICAL OPERATING CHARACTERISTICS
DC CHARACTERISTICS Min and Max values are over recommended operating conditions unless specified otherwise. Typical values are at VIN = 5.0V, TAMB = 25C Symbol Name IDD1 IDD2 IDD3 IDD4 ILKG RLIN RBIN VIH VIL IIL VOH VOL VRSET TSD THYS Supply Current Outputs Off Supply Current Outputs Off Supply Current Outputs On Supply Current Outputs On LED Output Leakage LIN Pull-down Resistance BIN Pull-up Resistance Logic high input voltage Logic low input voltage Logic Input Leakage Current VI = VDD or GND (CIN, SIN) xOUT Logic High Output Voltage IOH = -1mA xOUT Logic Low Output Voltage IOL = 1mA RSETx Regulated Voltage Thermal Shutdown Thermal Hysteresis 100mA LED Current Undervoltage Lockout (UVLO) Threshold
2
Conditions VLED = 5V, RSET = 24.9k VLED = 5V, RSET = 5.23k VLED = 0.5V, RSET = 24.9k VLED = 0.5V, RSET = 5.23k VLED = 5V, Outputs Off
Min
Typ 2 4 2 4
Max 5 10 5 10 1 250 250 0.7x VDD
Units mA mA mA mA A k k V A V V C C
-1 140 140 0.3x VDD -5 VCC-0.3V
180 180
0
5 0.3
1.17
1.2 150 20 400 1.8
1.23
ILED/IRSET RSET to LED Current Gain ratio VUVLO
V
Doc. No. MD-5038, Rev. A
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT4103 TIMING CHARACTERISTICS
Min and Max values are over recommended operating conditions unless specified otherwise. Typical values are at VIN = 5.0V, TAMB = 25C Symbol CIN fcin tcwh tcwl SIN tssu tsh LIN Tlwh tlchd tlcsu LEDn tledplon tledploff tledpbon tledpboff tledr tledf SOUT tsr tsf tsdf tsdr COUT tcr tcf tcdf tcdr LOUT tlr tlf tldf tldr BOUT tbr tbf tbdf tbdr BOUT rise time (10% to 90%) BOUT fall time (90% to 10%) Propagation delay time BOUT Propagation delay time BOUT CL = 15pF CL = 15pF BIN falling to BOUT falling BIN rising to BOUT rising
3
Name CIN Clock Frequency CIN Pulse Width High CIN Pulse Width Low Setup time SIN to CIN Hold time SIN to CIN LIN Pulse width Hold time LIN to CIN Setup time LIN to CIN Turn on Propagation delay LIN Turn off Propagation delay LIN Turn on Propagation delay BIN Turn off Propagation delay BIN LED rise time (10% to 90%) LED fall time (90% to 10%) SOUT rise time (10% to 90%) SOUT fall time (90% to 10%) Propagation delay time SOUT Propagation delay time SOUT COUT rise time (10% to 90%) COUT fall time (90% to 10%) Propagation delay time COUT Propagation delay time COUT LOUT rise time (10% to 90%) LOUT fall time (90% to 10%) Propagation delay time LOUT Propagation delay time LOUT
Conditions
Min
Typ
Max 25
Units MHz ns ns ns ns ns ns ns
18 18 4 4 20 4 8 LIN to LED(n) on LIN to LED(n) off BIN to LED(n) on BIN to LED(n) off Pullup resistor = 50 to 3.0V Pullup resistor = 50 to 3.0V CL = 15pF CL = 15pF CIN falling to SOUT falling CIN falling to SOUT rising CL = 15pF CL = 15pF CIN falling to COUT falling CIN rising to COUT rising CL = 15pF CL = 15pF LIN falling to LOUT falling LIN rising to LOUT rising 380 130 380 130 160 140 5 5 6 6 5 5 4 4 5 5 4 5 5 5 6 8 20 20 10 10 10 10 18 18
ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
Doc. No. MD-5038, Rev. A
CAT4103
1/fcin
CIN tssu tsh tcwl tcwh
SIN tsdf tsdr SOUT tlwd LIN tlchd tlcsu
Figure 2. Timing Diagram A
tledploff LIN
tledplon
tledpboff
BIN tledpbon
LED(n)
Figure 3. Timing Diagram B
Doc. No. MD-5038, Rev. A
4
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT4103 TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5V, VDD = 5V, C1 = 1F, TAMB = 25C unless otherwise specified. Quiescent Current vs. Input Voltage (ILED = 0mA)
1.2 QUIESCENT CURRENT [mA]
QUIESCENT CURRENT [mA]
Quiescent Current vs. RSET Current
8.0
No Load
1.0
6.0
0.8
4.0
0.6
2.0
0.4 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE [V] 5.5
0.0 0 100 200 300 RSET CURRENT [A] 400
Quiescent Current vs. Input Voltage (ILED = 175mA)
6.0 QUIESCENT CURRENT [mA]
LED Current vs. LED Pin Voltage
200
Full Load
5.5
LED CURRENT [mA]
3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE [V] 5.5
160 120 80 40 0 0.0 0.2 0.4 0.6 0.8 LED PIN VOLTAGE [V] 1.0
5.0
4.5
4.0
LED Current Change vs. Input Voltage
200 160 120 80 40 0 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE [V] 5.5
LED Current Change vs. Temperature
200 160 120 80 40 0 -40 0 40 80 TEMPERATURE [C] 120
LED CURRENT [mA]
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
5
LED CURRENT [mA]
Doc. No. MD-5038, Rev. A
CAT4103 TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5V, VDD = 5V, C1 = 1F, TAMB = 25C unless otherwise specified. RSET Pin Voltage vs. Input Voltage
1.30
RSET Pin Voltage vs. Temperature
1.30
RSET VOLTAGE [V]
1.25
RSET VOLTAGE [V]
1.25
1.20
1.20
1.15
1.15
1.10 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE [V] 5.5
1.10 -40 0 40 80 TEMPERATURE [C] 120
LED Current vs. RSET Resistor
200 160 120 80 40 0 0 15 30 RSET [k] 45 60
BIN Transient Response
LED CURRENT [mA]
Doc. No. MD-5038, Rev. A
6
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT4103 PIN DESCRIPTIONS
Name GND BIN LIN SIN CIN RSET3 RSET2 RSET1 LED3 LED2 LED1 COUT SOUT LOUT BOUT VDD Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Function Ground Reference Blank input pin Latch Data input pin Serial Data input pin Serial Clock input pin LED current set pin for LED3 LED current set pin for LED2 LED current set pin for LED1 LED channel 3 cathode terminal LED channel 2 cathode terminal LED channel 1 cathode terminal Serial Clock output pin Serial Data output pin Latch Data output pin Blank output pin Device Supply pin
PIN FUNCTION
GND is the ground reference pin for the entire device. This pin must be connected to the ground plane on the PCB. BIN is the blank input used to disable all channels. When low, all LED channels are enabled according to the output latch content. When high, all LED channels are turned off. This pin can be used to turn all the LEDs off while preserving the data in the output latches. LIN is the latch data input. On the rising edge of LIN, data is loaded from the 3-bit serial shift register into the output register latch. On the falling edge of LIN the data is latched in the output register and isolated from the state of the serial shift register. SIN is the serial data input. Data is loaded into the internal register on each rising edge of CIN. CIN is the serial clock input. On each rising CIN edge, data is transferred from SIN to the internal 3-bit serial shift register. RSET1 to RSET3 are the LED current set inputs. The current pulled out of these pins will be mirrored in the corresponding LED channel with a gain of 400. LED1 to LED3 are the LED current sink inputs. These pins are connected to the bottom cathodes of the LED strings. The current sinks bias the LEDs with a current equal to 400 times the RSET pin current. For the LED sink to operate correctly, the voltage on the LED pin must be above 0.4V. Each LED channel can withstand and operate with voltages up to 25V. COUT is a driven output of CIN and can be connected to the next device in the cascade. SOUT is the output of the 3-bit serial shift register. Connect to SIN of the next device in the cascade. SOUT is clocked on the falling edge of CIN. LOUT is a driven output of LIN and can be connected to the next chip in the cascade. BOUT is a driven output of BIN and can be connected to the next chip in the cascade. VDD is the positive supply pin voltage for the entire device. A small 1F ceramic capacitor is recommended close to the pin.
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
7
Doc. No. MD-5038, Rev. A
CAT4103 BLOCK DIAGRAM
LED1 LED2 LED3 1.2V Ref Current Setting VDD RSET1
Upon power-up, an under-voltage lockout circuit clears all latches and shift registers and sets all outputs to off. Once the VDD supply voltage is greater than the under-voltage lockout threshold, the device can be programmed. Pull-up and pull-down resistors are internally provided to set the state of the BIN and LIN pins to low current off state when not externally driven. A high-speed 4-wire interface is provided to program the state of each LED channel ON or OFF. The 4-wire interface contains a 3-bit serial-to-parallel shift register (S0-S2) and a 3-bit latch (L0-L2). The shift register operates on a first-in first-out (FIFO) basis. The most significant bit S2 corresponds to the first data entered in from SIN. Programming the serial-to-parallel register is accomplished via SIN and CIN input pins. On each rising edge of the CIN signal the data from SIN is moved through the shift register serially. Data is also moved out of SOUT to the next device if programming more than one device on the same interface. On the rising edge of LIN, the data content of the serial to parallel shift register is reflected in the latches. On the falling edge of LIN, the state of the serial-to-parallel register at that particular time is saved in the latches and does not change regardless of the content of the serial to parallel register. BIN is used to disable all LEDs off at one time while still maintaining the data contents of the latch register. BIN is an active low input pin. When low the outputs reflect the data in the latches. When high the outputs are all high impedance (LEDs off). All 4-wire inputs have a corresponding output driver for cascaded systems (SOUT, COUT, LOUT, BOUT). These output buffers allow many CAT4103 drivers to be cascaded without signal and timing degradation due to long wire interconnections.
CURRENT SINKS
+
Current Setting RSET2 Current Setting RSET3
BIN BLANK LATCH LIN L0 L1 L2
BOUT
LOUT SIN S0 S1 S2 D CK COUT Q SOUT
SHIFT REGISTER CLOCK
CIN
GND
Figure 1. CAT4103 Functional Block Diagram
BASIC OPERATION
The CAT4103 uses 3 independent current sinks to accurately regulate the current in each LED channel to 400 times the current sink from the corresponding RSET pin. Each of the resistors tied to the RSET1, RSET2, RSET3 pins set the current respectively in the LED1, LED2, and LED3 channels. Table 1 shows some standard resistor values for RSET and the corresponding LED current. Table 1. RSET Resistor Settings LED Current [mA] 20 60 100 175 RSET[k] 24.9 8.45 5.23 3.01
Tight current regulation for all channels is possible over a wide range of input and LED voltages due to independent current sensing circuitry on each channel. The LED channels have a low dropout of 0.4V or less for all current ranges and supply voltages. This helps improve heat dissipation and efficiency over other competing solutions.
Doc. No. MD-5038, Rev. A
8
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT4103 APPLICATION INFORMATION
CASCADING MULTIPLE DEVICES The CAT4103 is designed to be cascaded for driving multiple RGD LEDs. Figure 5 shows three CAT4103 drivers cascaded together. The programming data from the controller travels serially through each device. Figure 4 shows a programming example turning on the following LED channels: BLUE3, GREEN2 and RED1. The programming waveforms are measured from the controller to the inputs of the first CAT4103.
Figure 4. Programming Example
5V C1 1F RED1 GREEN1 LED2 BLUE1 C2 1F RED2 GREEN2 LED2 BLUE2 C3 1F RED3 GREEN3 LED2 BLUE3
VDD LED1
LED3 BOUT
VDD LED1 BIN LIN SIN CIN GND RSET1 R4
LED3 BOUT
VDD LED1 BIN LIN SIN CIN GND RSET1 R7
LED3 BOUT
CONTROLLER
BIN LIN SIN CIN GND RSET1 R1 RSET2 R2
CAT4103 #1
LOUT SOUT COUT RSET3 R3
CAT4103 #2
LOUT SOUT COUT
CAT4103 #3
LOUT SOUT COUT
RSET2 R5
RSET3 R6
RSET2 R8
RSET3 R9
Figure 5. Three Cascaded CAT4103 Devices
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
9
Doc. No. MD-5038, Rev. A
CAT4103
POWER DISSIPATION The power dissipation (PD) of the CAT4103 can be calculated as follows:
PD = (VDD x IDD ) + (VLEDN x ILEDN )
RECOMMENDED LAYOUT Bypass capacitor C1 should be placed as close to the IC as possible. RSET resistors should be directly connected to the GND pin of the device. For better thermal dissipation, multiple via can be used to connect the GND pad to a large ground plane. It is also recommended to use large pads and traces on the PCB wherever possible to spread out the heat. The LEDs for this layout are driven from a separate supply (VLED+), but they can also be driven from the same supply connected to VDD.
where VLEDN is the voltage at the LED pin, and ILEDN is the associated LED current. Combinations of high VLED voltage or high ambient temperature can cause the CAT4103 to enter thermal shutdown. In applications where VLEDN is high, a resistor can be inserted in series with the LED string to lower PD. Thermal dissipation of the junction heat consists primarily of two paths in series. The first path is the junction to the case (JC) thermal resistance which is defined by the package style, and the second path is the case to ambient (CA) thermal resistance, which is dependent on board layout. The overall junction to ambient (JA) thermal resistance is equal to: JA = JC + CA For a given package style and board layout, the operating junction temperature TJ is a function of the power dissipation PD, and the ambient temperature, resulting in the following equation: TJ = TAMB + PD (JC + CA) = TAMB + PD JA When mounted on a double-sided printed circuit board with two square inches of copper allocated for "heat spreading", the resulting JA is about 74C/W. For example, at 60C ambient temperature, the maximum power dissipation is calculated as follow:
PDmax = (TJmax - TAMB ) (150 - 60) = = 1.2W JA 74
Figure 6. Recommended Layout
Doc. No. MD-5038, Rev. A
10
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT4103 PACKAGE OUTLINE DRAWING
SOIC 16-LEAD 150MILS (V)
0
(1)(2)
SYMBOL
MIN
NOM
MAX
A A1 b c
E1 E
1.35 0.10 0.33 0.19 9.80 5.80 3.80 0.25 0.40 0 9.90 6.00 3.90 1.27 BSC
1.75 0.25 0.51 0.25 10.00 6.20 4.00 0.50 1.27 8
D E E1 e h L
PIN#1 IDENTIFICATION
TOP VIEW
D
h
A
e
b A1
L
c
SIDE VIEW
END VIEW
For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf.
Notes: (1) All dimensions in millimeters. Angle in degrees. (2) Compiles with JEDEC standard-012.
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
11
Doc. No. MD-5038, Rev. A
CAT4103 EXAMPLE OF ORDERING INFORMATION1 (1)
F1F1F
Prefix CAT
Company ID
Device # Suffix 4103 V
Package V: SOIC
-
G
T2
Tape & Reel T: Tape & Reel 2: 2,000/Reel
Product Number
4103
Lead Finish G: NiPdAu Blank: Matte-Tin
Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard plated finish is NiPdAu. (3) The device used in the above example is a CAT4103V-GT2 (SOIC, NiPdAu, Tape & Reel, 2,000/Reel). (4) For additional temperature options, please contact your nearest ON Semiconductor Sales office.
Doc. No. MD-5038, Rev. A
12
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT4103
REVISION HISTORY
Date 31-Oct-08 Revision A Description Initial Issue
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: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center: Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
13
Doc. No. MD-5038, Rev. A

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