REGULATING PULSE WIDTH MODULATORS - Seme LAB
Description
LAB
TOP VIEW
INV.
INPUT 1 N.
I.
INPUT 2 SYNC 3 OSC.
OUTPUT 4 CT 5 RT 6 DISCHARGE 7 SOFT START 8
16 15 14 13 12 11 10 9
SEME
IP1525A SERIES IP1527A SERIES
VREF
VIN OUTPUT B VC GROUND OUTPUT A SHUTDOWN COMPENSATION
REGULATING PULSE WIDTH MODULATORS
FEATURES
• • • • • • • • • 8 to 35V operation 5.
1V reference trimmed to ±1% 100Hz to 500kHz oscillator range Separate oscillator sync terminal Adjustable deadtime control Internal soft start Input undervoltage lockout Latching PWM to prevent multiple pulses Dual source/sink output drivers
J Package – 16 Pin Ceramic DIP N Package – 16 Pin Plastic DIP D Package – 16 Pin Plastic (300) SOIC
Order Information
Part Number IP1525A IP1527A IP3525A IP3527A J–Pack 16 Pin N–Pack 16 Pin D–16 16 Pin Temp.
Range -55 to +125°C -55 to +125°C 0 to +70°C 0 to +70°C Note: To order, add the package identifier to the part number.
eg.
IP1525AJ IP3527AD–16
ABSOLUTE MAXIMUM RATINGS (Tcase = 25°C unless otherwise stated)
+VIN Input Voltage Collector Voltage Logic Inputs Analogue Inputs Output Current, Source or Sink Reference Output Load Current Oscillator Charging Current PD PD TJ TSTG TL Power Dissipation Power Dissipation TA = 25°C Derate @ TA > 50°C TC = 25°C Derate @ TC > 25°C +40V +40V –0.
3 to +5.
5V –0.
3 to +VIN 500mA Internally Limited 5mA 1W 10mW/°C 2W 16mW/°C See Ordering Information –65 to +150°C (soldering, 10 seconds) +300°C
Prelim.
3/95
Operating Junction Temperature Storage Temperature Range Lead Temperature
Semelab plc.
Telephone (01455) 556565.
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LAB
DESCRIPTION BLOCK DIAGRAM
VREF
16
SEME
IP1525A SERIES IP1527A SERIES
The IP1525A and IP1527A families of PWM switching regulator control circuits offer improved performance and lower parts count when used in designing switching power supplies.
Included are 5.
1 volt reference, error amplifier, adjustable dead-time oscillator with synchronisation capability, latched PWM comparator, totem-pole output drivers, shutdown, soft start, and undervol...
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