描述 Description

The SG3525A PWM Controller offers improved performance and lower external parts count when implemented for controlling all types of switching power supplies. The on-chip +5.1 V reference is trimmed to +/-1% and the error amplifier has an input common-mode voltage range that includes the reference voltage, thus eliminating the need for external divider resistors. A sync input to the oscillator enables multiple units to be slaved or a single unit to be synchronized to an external system clock. A wide range of deadtime can be programmed by a single resistor connected between the CT and Discharge pins. This device also features built-in soft-start circuitry, requiring only an external timing capacitor. A shutdown pin 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. The under voltage lockout inhibits the outputs and the changing of the soft-start capacitor when VCC is below nominal. The output stages are totem-pole design capable of sinking and sourcing in excess of 200 mA. The output stage of the SG3525A features NOR logic resulting in a low output for an off-state.

特性 Features

? 8.0 V to 35 V Operation
? 5.1 V +/- 1.0% Trimmed Reference
? 100 Hz to 400 kHz Oscillator Range
? Separate Oscillator Sync Pin
? Adjustable Deadtime Control
? Input Undervoltage Lockout
? Latching PWM to Prevent Multiple Pulses
? Pulse-by-Pulse Shutdown
? Dual Source/Sink Outputs: +/- 400 mA Peak
? Pb-Free Packages are Available*

應(yīng)用 Application

? Half Bridge
? Push-Pull

簡介

SG3525A屬于集成電路（IC）的DC-DC開關(guān)控制器。由制造生產(chǎn)的SG3525ADC-DC 開關(guān)控制器PMIC（電源管理集成電路）DC 到 DC 開關(guān)式控制器是用于高效率電路的穩(wěn)壓 IC，其配置為生成高于（突升或步升）或低于（突降或步降）輸入電源的輸出電源電壓。其他拓?fù)浣Y(jié)構(gòu)可能包括：降壓-升壓、反激、正激、Cuk、SEPIC、全橋、半橋和推挽式。這些器件不同于需要最小電壓并“燒盡”多余電壓的線性穩(wěn)壓器。