UC1525A

Product Folder Order Now Technical Documents Tools & Software Support & Community 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...