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LAB
TOP VIEW
INV. INPUT 1 N. I. INPUT 2 OSC. OUTPUT 3 +C.L. SENSE 4 -C.L. SENSE 5 RT 6 CT 7 GROUND 8
16 15 14 13 12 11 10 9
SEME
IP1524 SERIES
VREF VIN EB CB CA EA SHUTDOWN COMPENSATION
REGULATING PULSE WIDTH MODULATORS
FEATURES
* * * * * Guaranteed 2% reference voltage tolerance Guaranteed 6% oscillator tolerance Fully specified temperature performance Guaranteed 10mV/1000 hours long term stability Interchangeable with SG1524 series
J Package - 16 Pin Ceramic DIP N Package - 16 Pin Plastic DIP D Package - 16 Pin Plastic (150) SOIC
Order Information
Part Number IP1524 IP2524 IP3524 J-Pack 16 Pin N-Pack 16 Pin D-16 16 Pin Temp. Range -55 to +125C -25 to +85C 0 to +70C Note: To order, add the package identifier to the part number. eg. IP1524J IP3524D-16
ABSOLUTE MAXIMUM RATINGS (Tcase = 25C unless otherwise stated)
+VIN Input Voltage Collector Voltage Output Current Reference Load Current Oscillator Charging Current Shut Down Pin Voltage Current Limit Sense Common Mode Range PD PD TJ TSTG TL Power Dissipation Power Dissipation TA = 25C Derate @ TA > 50C TC = 25C Derate @ TC > 25C (each transistor) +40V +40V 100mA Internally Limited 5mA +5.5V -1.0 to +1.0V 1W 10mW/C 2W 16mW/C See Ordering Information -65 to +150C (soldering, 10 seconds) +300C
Prelim. 3/95
Operating Junction Temperature Storage Temperature Range Lead Temperature
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
LAB
DESCRIPTION
The IP1524 series of PWM switching regulator control circuits contains all the functions required to implement singleended or push-pull switching regulators. Included are voltage reference, error amplifer, oscillator, PWM comparator, output drivers, current limiting and shutdown circuitry. Although functionally indentical to the SG1524 series, SEMELAB has incorporated several improvements to the IP1524 allowing tighter and more complete specification of electrical performance.
SEME
IP1524 SERIES
BLOCK DIAGRAM
16
VIN
15
REFERENCE REGULATOR
+5V TO ALL INTERNAL CIRCUITRY OSCILLATOR OUTPUT
3
12
RT CT
6
CA
NOR FLIP FLOP
11
7
OSCILLATOR
EA CB
13
+5V COMPARATOR NOR INV. INPUT N.I. INPUT GND (SUBSTRATE) SHUTDOWN
1 2 14
ERROR AMP +5V
9
EB
+5V C.L. COMPENSATION
4 5
+SENSE -SENSE
8
10
1k
10k
RECOMMENDED OPERATING CONDITIONS
VIN Input Voltage Collector Voltage Error Amp Common Mode Range Output Current Reference Load Current Oscillator Charging Current Oscillator Frequency Range RT CT TAMB Oscillator Timing Resistor Oscillator Timing Capacitor Operating Ambient Temperature Range IP1524 IP2524 IP3524 (each transistor) +8 to +40V 0 to +40V +1.8 to +3.4V 0 to 100mA 0 to 20mA 30A to 2mA 50Hz to 500kHz 1.8k to 100k 1nF to 0.1F -55 to +125C -25 to +85C 0 to +70C
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
LAB
ELECTRICAL CHARACTERISTICS (TJ = 25C unless otherwise stated)
Parameter Output Voltage Line Regulation Load Regulation Ripple Rejection Short Circuit Current Temperature Stability Long Term Stability Test Conditions 1 IP1524 IP2524 Min. Typ. Max. Min. IP3524 Typ. Max. Units
SEME
IP1524 SERIES
REFERENCE SECTION
TJ = Over Temp. Range +VIN = 8 to 40V IL = 0 to 20mA f = 120Hz VREF = 0 TJ = Over Temp. Range TJ = Over Temp. Range TJ = Over Temp. Range
4.90
5.00 1 5 80
5.10 10 20 120 1 10
4.60
5.00 10 20 66 100 0.3 20
5.40 30 50
V mV dB mA
25
50 0.3 1
TJ = Over Temp. Range TJ = 125C
1
% mV khr
OSCILLATOR SECTION
Initial Accuracy Voltage Stability Temperature Stability Minimum Frequency Maximum Frequency Sawtooth Peak Voltage Sawtooth Valley Voltage Clock Amplitude Clock Pulse Width Input Offset Voltage Input Bias Current Input Offset Current DC Open Loop Gain Output Low Level Output High Level Common Mode Rejection Supply Voltage Rejection Gain Bandwidth Product +VIN = 8 to 40V RT = 2.7k +VIN = 8 to 40V TJ = Over Temp. Range RT = 100k RT = 2k CT = 0.01F CT = 0.01F Output, Pin 3 Output, Pin 3 CT = 0.01F CT = 0.01F
2
CT = 0.01F
6 0.1 1 120 200 300 3.6 0.6 3.0 0.3 1 4.0 0.5 0.1 1 72 3.8 70 70 90 100 3 80 0.5 3.8 70 70 1.0 5 2 0.5 60 1 2 240
5 0.5 1 2 120 300 3.6 1 3.5 0.5 2 1 80 0.5 10 10 1 Hz kHz V V s mV A dB V dB 3 MHz %
CT = 0.1F CT = 0.001F
TJ = Over Temp. Range TJ = Over Temp. Range
TJ = Over Temp. Range
ERROR AMP SECTION
TJ = Over Temp. Range TJ = Over Temp. Range TJ = Over Temp. Range TJ = Over Temp. Range VPIN1 - VPIN2 150mV VPIN2 - VPIN2 150mV
NOTES
1. Test Conditions unless otherwise stated: VIN = 20V , IREF = 0. 2. VCM = +1.8 to +3.4V 3. VCM = -1 to +1V
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
LAB
ELECTRICAL CHARACTERISTICS (TJ = 25C unless otherwise stated)
Parameter Test Conditions 1 IP1524 IP2524 Min. Typ. Max. Min. IP3524 Typ. Max. Units
SEME
IP1524 SERIES
PWM COMPARATOR
Minimum Duty Cycle Maximum Duty Cycle VPIN1 - VPIN2 150mV TJ = Over Temp. Range VPIN2 - VPIN1 150mV TJ = Over Temp. Range
0 45 49 45 49
0
% %
CURRENT LIMIT AMPLIFIER 3
Sense Voltage VCM = 0 VCM = 0 VPIN9 0.6V TJ = Over Temp. Range TJ = Over Temp. Range
190 170 1.2
200 200
210 230
180
200 200
220
mV
SHUTDOWN INPUT
High Input Voltage High Input Current Low Input Voltage
1.2 4 8 0.3 4 0.3 40 0.1 1 50 2 17 0.4 0.2 10 0.1 1 18 0.2 0.1 5 10 50 2
V mA V V A V V s
VSHUTDOWN = +5V TJ = Over Temp. Range VPIN9 3.5V TJ = Over Temp. Range TJ = Over Temp. Range TJ = Over Temp. Range TJ = Over Temp. Range TJ = Over Temp. Range
OUTPUT SECTION (each transistor)
Collector - Emitter Voltage IC = 50A Collector Leakage Current Collector Saturation Voltage Emitter Output Voltage Emitter Voltage Rise Time VCE = 40V IC = 50mA VIN = 20V RE = 2k
40
17
18 0.2 0.1
Collector Voltage Fall Time RC = 2k
POWER CONSUMPTION
Standby Current VIN = 40V TJ = Over Temp. Range
5
mA
NOTES
1. Test Conditions unless otherwise stated: VIN = 20V , IREF = 0. 2. VCM = +1.8 to +3.4V 3. VCM = -1 to +1V
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
LAB
APPLICATIONS INFORMATION
The IP1524 is a fixed-frequency pulse-width modulation voltage regulator control circuit. The regulator operates at a frequency that is programmed by one timing resistor (RT) and one timing capacitor (CT). RT establishes a constant charging current for CT, which is fed to the comparator providing linear control of the output pulse width by the error amplifier. The IP1524 contains an on-board 5V regulator that serves as a reference as well as powering the IP1524's internal control circuitry and is also useful in supplying external support functions. This reference voltage is lowered externally by a resistor divider to provide a reference within the common-mode range of the error amplifier or an external reference may be used. The power supply output is sensed by a second resistor divider network to generate a feedback signal to the error amplifier. The amplifier output voltage is then compared to the linear voltage ramp at C T . The resulting modulated pulse out of the high-gain comparator is then steered to the appropriate output pass transistor (Q1 or Q2) by the pulse-steering flip-flop, which is synchronously toggled by the oscillator output.
+ 28 V 5k
5k
SEME
IP1524 SERIES
The oscillator output pulse also serves as a blanking pulse to assure both outputs are never on simultaneously during the transition times. The width of the blanking pulse is controlled by the value of CT. The outputs may be applied in a push-pull configuration in which their frequency is half that of the base oscillator, or paralleled for single-ended applications in which the frequency is equal to that of the oscillator. The output of the error amplifier shares a common input to the comparator with the current limiting and shutdown circuitry and can be overridden by signals from either of these inputs. This common point is also available externally and may be employed to control the gain of, or to compensate, the error amplifier, or to provide additional control to the regulator.
0.9 mH 68 VI N I NV . N. I. 5k
+5V 1A + 28 V 5k
5k
CA
EA
150
VI N INV. N. I.
1k 1W
1k 1W 1mH
5k 0. 1F 3k 0. 02F
1 N3 8 80 5 0 0F 2k
CA
EA 1k 20 T 20 T 5V 5A
5k 0.1F 2k 0. 01F 5k
VRE F
RT
CB
EB
5 T 5 T
1 0 0F
VRE F
RT
CB
1k EB
CT
OS C. SH .DOWN GND
CL + C L-
CT
OS C. COM P. 0.0 01F 50k GND RE TURN
0 . 1
CL + C LCOMP . 0.001F 20k 0 . 1
1 0 0F
SH .DOWN GND
RE TURN
In this conventional single-ended regulator circuit, the two outputs of the IP1524 are connected in parallel for effective 0-90% duty cycle modulation. The use of an output inductor requires an R-C phase compensation network for loop stability.
Push-pull outputs are used in this transformer-coupled DC-DC regulating converter. Note that the oscillator must be set at twice the desired output frequency as the IP1524's internal flip-flop divides the frequency by 2 as it switches the PWM signal from one output to the other. Current limiting is done in the primary so that the pulse width will be reduced should transformer saturation occur.
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
LAB
TYPICAL PERFORMANCE CHARACTERISTICS
Open-Loop Voltage Amplification of Error Amplifier vs. Frequency
90 OPEN LOOP VOLTAGE AMPLIFICATIO N (dB) 80 70 60 50 40 30 20 10 0 -10 100 1k 10k 100k 1M 10M 100 1 2 RT 5 10 20 50 100 TIMING RESISTOR (k)
Note: Value of RL below 30k will begin to limit the maximum duty cycle.
SEME
IP1524 SERIES
Oscillator Frequency vs. Timing Components
1M
RL = RL = 1M RL = 300k RL = 100k R = 30k
L
VIN = 20V TJ = 25C
OSCILLATOR FREQUENCY (Hz)
C
T
100k
C
T
=0
. 00
1 F
F
=0 .0
03
C
T
10k
C
T
=0 .01 =0 .0
=0 .1
F
3
F
F
C
T
1k
VIN = 20V TJ = 25C
FREQUENCY (Hz)
Output Dead Time vs. Timing Capacitance Value
10
VIN = 20V TJ = 25C
Output Saturation Voltage vs. Load Current
4
VIN = 20V
COLLECTOR - EMITTER VOLTAGE (V)
OUTPUT DEAD TIME (s)
3
1
2
TJ
2 =1
TJ =
5 C
2 5 C
C
TJ =
- 5 5
Note: Dead Time = Oscillator output pulse width plus output delay.
1
0.1 0.001 C
T
0 0.01 TIMING CAPACITOR (F) 0.1 0 20 40 60 80 100
LOAD CURRENT (mA)
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95

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