器件名称: UC1525
功能描述: Regulating Pulse Width Modulators
文件大小: 653.24KB 共14页
简 介:application INFO available
UC1525B UC1527B UC2525B UC2527B UC3525B UC3527B
Regulating Pulse Width Modulators
FEATURES
8 to 35V Operation 5.1V Buried Zener Reference Trimmed to ±0.75% 100Hz to 500kHz Oscillator Range Separate Oscillator Sync Terminal Adjustable Deadtime Control Internal Soft-Start Pulse-by-Pulse Shutdown Input Undervoltage Lockout with Hysteresis Latching PWM to Prevent Multiple Pulses Dual Source/Sink Output Drivers Low Cross Conduction Output Stage Tighter Reference Specifications
DESCRIPTION
The UC1525B/1527B 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 +5.1V buried zener reference is trimmed to ±0.75% and the input common-mode range of the error amplifier includes the reference voltage, eliminating external resistors. A sync input to the oscillator allows multiple units to be slaved or a single unit to be synchronized to an external system clock. A single resistor between the CT and the discharge terminals provide a wide range of dead time adjustment. These devices also feature built-in soft-start circuitry with only an external timing capacitor required. A shutdown terminal controls both the soft-start circuitry and the output stages, providing instantaneous turn off through the PWM latch with pulsed shutdown, as well as soft-start recycle with longer shutdown commands. These functions ……
