UC2527AN

Texas Instruments隔离式回扫电源控制器提供恒定电压 CV 和恒定电流 CC 输出调节，用于提高对较大负载阶跃的瞬时响应。 初级侧调节 PSR 无需光耦合器。### 回扫控制器，Texas Instruments电流模式和电压模式 PWM 控制器 初级侧调节 峰值功率模式 低功率

DESCRIPON

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 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.

1FEATURES

• 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 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