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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
IP1524B SERIES
REGULATING PULSE WIDTH MODULATORS
VREF VIN EB CB CA EA SHUTDOWN COMPENSATION
FEATURES
* * * * * * * * * * * * Pin Compatible with IP1524 Series 7 to 40 volt operation 5 volt reference trimmed to 1% Undervoltage lockout Excellent external sync capability Wide current limit common mode range +5 Volt error amplifier common mode PWM data latch Full double-pulse suppression logic 50ns shutdown function Dual 200mA, 60V output transistors Fully specified over temperature
J Package - 16 Pin Ceramic DIP N Package - 16 Pin Plastic DIP D Package - 16 Pin Plastic (300) SOIC
Order Information
Part Number IP1524B IP2524B IP3524B 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. IP1524BJ IP3524BD-16
ABSOLUTE MAXIMUM RATINGS (Tcase = 25C unless otherwise stated)
+VIN Input Voltage Collector Voltage Logic Inputs Current Limit Sense Inputs Oscillator Charging Current PD PD TJ TSTG TL Power Dissipation Power Dissipation TA = 25C Derate @ TA > 50C TC = 25C Derate @ TC > 25C +40V +60V -0.3 to +5.5V -0.3 to +VIN 5mA 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 IP1524B is a pulse width modulator for switching power supplies which features improved performance over industry standards like the SG1524. A direct pin-for-pin replacement for the earlier device, it combines advanced processing techniques and circuit design to provide improved reference accuracy/ and extended common mode range at the error amplifier and current limit inputs. A DC-coupled flip-flop eliminates triggering and glitch problems, and a PWM data latch prevents edge oscillations. The circuit incorporates true digital shutdown for high speed response, while an undervoltage lockout circuit prevents spurious outputs when the supply voltage is too low for stable operation. Full double-pulse suppression logic insures alternating output pulses when the shutdown pin is used for pulse-by-pulse current limiting.
SEME
IP1524B SERIES
BLOCK DIAGRAM
VREF
16
15
+VIN
8
REFERENCE REGULATOR
UNDER VOLTAGE LOCKOUT
GND TO INTERNAL CIRCUITRY RT CT
6
OSC.
3
12
CA
7
OSCILLATOR S T R Q Q TOGGLE F/F
14 13
Q
11
EA
INV. INPUT N.I. INPUT +C.L. SENSE -C.L. SENSE
1 2
SQ PWM ERROR D Q PWM LATCH C.L.
10
MEMORY F/F
CB
EB
4 5
9
SHUTDOWN
COMPENSATION
RECOMMENDED OPERATING CONDITIONS
VIN Input Voltage Collector Voltage Error Amp Common Mode Range Current Limit Sense Common Mode Range Output Current Reference Load Current Oscillator Charging Current Oscillator Frequency Range RT CT Oscillator Timing Resistor Oscillator Timing Capacitor Operating Ambient Temperature Range IP1524B IP2524B IP3524B (each transistor) +7 to +40V 0 to +60V +2.3 to VREF 0 to VIN - 2.5V 0 to 200mA 0 to 20mA 25A to 1.8mA 50Hz to 500kHz 2k to 150k 1nF to 0.1F -55 to +125C -25 to +85C 0 to +70C
Prelim. 3/95
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
LAB
ELECTRICAL CHARACTERISTICS (TJ = Over Operating Temperature Range unless otherwise stated)
Parameter Test Conditions 1 IP1524B IP2524B Min. Typ. Max.
4.3 0.1 VIN = 7 to 40V 5.2 0.3 7 6.5 0.6 10
SEME
IP1524B SERIES
Min.
4.3 0.1
IP3524B Typ. Max.
5.2 0.3 7 6.5 0.6 10
Units
V mA
TURN-ON CHARACTERISTICS
VIN Undervoltage Threshold VIN Rising Turn-on Hysteresis Operating Current
REFERENCE SECTION
Output Voltage Line Regulation Load Regulation Temperature Stability Short Circuit Current Long Term Stability VREF = 0 TJ = 25C 25 TJ = 25C VIN = 7 to 40V VIN = 7 to 40V IL = 0 to 20mA IL = 0 to 20mA 4.95 4.90 1 5 40 70 1
2
5.00
5.05 5.10 10 15 75 120 10
4.90 4.85
5.00
5.10 5.15
V
1 5 40 25 70 1
15 25 75 120 mA mV khr mV
OSCILLATOR SECTION
Initial Accuracy Voltage Stability Temperature Stability Minimum Frequency Maximum Frequency Clock Amplitude Clock Pulse Width Sawtooth Peak Voltage Sawtooth Valley Voltage Sawtooth Valley T.C. RT = 150k RT = 2k Output, Pin 3 Output, Pin 3 CT = 0.01F CT = 0.01F TJ = 25C TJ = 25C VIN = 7 to 40V
41
43 0.1 1
45 1 2 140
39
43 0.1 1 80
47 1 2 140
kHz % Hz kHz V s V mV/C
CT = 0.1F CT = 470pF CT = 0.01F CT = 0.01F 400 3.0 0.4
80 700 4.0 0.5 3.7 0.6 1 -1
400 3.0 1.2 4.0 1.1 0.6 0.4
700 4.0 0.5 3.7 1 -1 1.2 4.0 1.1
ERROR AMP SECTION
Input Offset Voltage Input Bias Current Input Offset Current VCM = 2.3 to VREF VCM = 2.3 to VREF VCM = 2.3 to VREF 0.1 1 0.1 5 5 1 2 1 0.1 10 10 1 mV A
NOTES
1. Test Conditions unless otherwise stated: VIN = 20V , IREF = 0. TJ = -55 to +125C for IP1524B TJ = -25 to +85C for IP2524B for IP3524B TJ = 0 to +70C 2. RT = 2.7K , CT = 0.01F unless otherwise stated.
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
LAB
ELECTRICAL CHARACTERISTICS (TJ = Over Operating Temperature Range unless otherwise stated)
Parameter
DC Open Loop Gain Common Mode Rejection Supply Voltage Rejection Output Low Level Output High Level Gain Bandwidth Product
SEME
IP1524B SERIES
Test Conditions 1
IP1524B IP2524B Min. Typ. Max.
60 70 76 75 90 120 0.2 3.8 1 4.2 2 0.5
Min.
60 70 76
IP3524B Typ. Max.
75 90 120 0.2 0.5
Units
ERROR AMP SECTION (cont.)
VO = 1 to 3V VIN = 7 to 40V ISINK = 100A ISOURCE = 100A TJ = 25C RL 10M VCM = 2.3 to VREF dB
3.8 1
4.2 2
V MHz
PWM COMPARATOR
Minimum Duty Cycle Maximum Duty Cycle VPIN1 - VPIN2 150mV VPIN2 - VPIN1 150mV 45 49 0 45 49 0 %
CURRENT LIMIT AMPLIFIER
Sense Voltage VCM = 0 to 17.5V VIN = 7 to 40V VCM = 0 to 17.5V VIN = 7 to 40V 180 200 220 180 200 220 mV A
Input Bias Current
-1
-10
-1
-10
SHUTDOWN INPUT
High Input Voltage High Input Current Low Input Voltage Shutdown Delay Pin 10 to output TJ = 25C 50 VSHUTDOWN = 5V 2.0 0.1 1 0.6 50 2.0 0.1 1 0.6 V mA V ns A V
OUTPUT SECTION (each transistor)
Collector Leakage Current Collector Saturation Voltage VCE = 60V IC = 20mA IC = 200mA IE = 50mA IE = 200mA RE = 2k RC = 2k TJ = 25C TJ = 25C 17 16.5 0.1 0.2 1.0 19 18 0.2 0.1 0.4 0.2 20 0.4 2.2 17 16.5 0.1 0.2 1.0 19 18 0.2 0.1 20 0.4 2.2
Emitter Output Voltage Emitter Voltage Rise Time Collector Voltage Fall Time
V s
NOTES
1. Test Conditions unless otherwise stated: VIN = 20V , IREF = 0. TJ = -55 to +125C for IP1524B TJ = -25 to +85C for IP2524B for IP3524B TJ = 0 to +70C
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
LAB
APPLICATIONS INFORMATION
Current Sensing in the Ground Line
+VOUT
SEME
IP1524B SERIES
Current Sensing in the Output Line
RAW SUPPLY RSENSE +VOUT
-C.L.
5
+C.L.
4
GND
8 12 13 4 5
100 RAW SUPPLY RETURN
CA
CB
+C.L.
-C.L.
RETURN
RSENSE
RETURN
Sensing Primary Current with an Emitter Resistor
EB
14
Oscillator Sync to an External Clock
16
16
EA
11
TTL
3
CMOS 3.2k 2N2369
3
1N914 +C.L.
4
3.2k RSENSE
5
-C.L.
A. TTL Logic
B. 5 Volt CMOS Logic
Driving Power MOSFETs
+15V
12
Driving Power Bipolar Transistors
1.6k
12
11
D1
TO LOAD
11
0.01F Q2 Q1 4.7k
TO LOAD
Q1 1.6k
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
LAB
TYPICAL PERFORMANCE CHARACTERISTICS
Oscillator Frequency vs. Timing Components Output Dead Time vs. Timing Capacitance Value
SEME
IP1524B SERIES
Pulse Width Modulation Transfer Function
Output Saturation Voltage
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95
LAB
TYPICAL PERFORMANCE CHARACTERISTICS
Error Amplifier Voltage Gain vs. Frequency Undervoltage Lockout Characteristics
SEME
IP1524B SERIES
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 3/95

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