器件名称: UC2525ADWTR
功能描述: Regulating Pulse Width Modulators
文件大小: 440.56KB 共9页
简 介:UC1525A/27A UC2525A/27A UC3525A/27A
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 Pulse-by-Pulse Shutdown Input Undervoltage Lockout with Hysteresis Latching PWM to Prevent Multiple Pulses Dual Source/Sink Output Drivers
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 +5.1V reference is trimmed to ±1% 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 provides 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 are also controlled by an undervoltage lockout which keeps the outputs off and the soft-start capacitor discharged for sub-normal input volt……
