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UC1525A, UC1527A, UC2525A UC2527A...
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UC1525A, UC1527A, UC2525A UC2527A, UC3525A, UC3527A
SLUS191D – FEBRUARY 1997 – REVISED JULY 2017
UCx52xA Regulating Pulse Width Modulators
1 Features
1 8-V to 35-V Operation 5.1-V Reference Trimmed to 1% 100-Hz to 500-kHz Oscillator Range Separate Oscillator Sync Terminal Adjustable Dead-Time Control Internal Soft Start Pulse-by-Pulse Shutdown Input Undervoltage Lockout With Hysteresis Latching PWM to Prevent Multiple Pulses Dual Source and Sink Output Drivers
2 Applications
Off-Line and DC/DC Power Supplies Converters Using Voltage Mode Single-Ended or Two-Switch Topology Designs Solar Inverters Welding Inverters Motor Control Battery Chargers
Block Diagram
OSC VREF OUT
16 4
+VIN 15 GROUND 12
SYNC 3 RT 6 CT 5
DISCHARGE 7
Reference
Regulator
To Internal Circutry
OSC
UVLO Lockout
Flip Flop
COMPENSATION 9 INV INPUT 1 NI INPUT 2
SOFTSTART 8
Error Amp
3 kŸ SHUTDOWN 10
VREF
SR PWM Latch
S
50 µA
5 kŸ
NOR
NOR UC1525A Output Stage
OR
OR UC1527A Output Stage
13 VC 11 OUTPUT A
14 OUTPUT B 13 VC 11 OUTPUT A
14 OUTPUT B
3 Description
The UC1525A/1527A series of pulse width modulator integrated circuits are designed to offer improved performance and lowered external parts count when used in designing all types of switching power supplies. The on-chip 5.1-V reference is trimmed to 1% and the input common-mode range of the error amplifier includes the refer...