描述 Description

The SG1825C is a high-performance pulse width modulator optimized for high frequency current-mode power supplies. Included in the controller are a precision voltage reference, micro power start-up circuitry, soft-start, high frequency oscillator, wideband error amplifier, fast current limit comparator, full double-pulse suppression logic, and dual totem pole output drivers. Innovative circuit design and an advanced linear Schottky process result in very short propagation delays through the current limit comparator, logic, and output drivers. This device can be used to implement either current mode or voltage mode switching power supplies. It also is useful as a series-resonant controller to frequencies beyond 1MHz. The SG1825C is specified for operation over the full military ambient temperature range of -55°C to 125°C.Microchip Ordering Part? Standard Microcircuit Drawing (SMD)?SG1825CJ-DESCCross Reference 5962-8768101EASG1825CJ-DESCCross Reference 5962-8768101EX

特性 Features

Improved Reference Initial Tolerance (±1% max.)
Improved Oscillator Initial Accuracy (±3% typ.)
Improved Startup Current (500μA typ.)- Propagation Delay to Outputs (50ns typ.)
10V to 30V Operation
5.1V Reference Trimmed to ±1%
2MHz Oscillator Capability
1.5A Peak Totem-Pole Drivers
U.V. Lockout with Hysteresis
No Output Driver “FLOAT”
Programmable Softstart
Double-Pulse Suppression Logic
Wideband Low-Impedance Error Amplifier
Current-Mode or Voltage-Mode Control

簡介

SG1825C屬于集成電路（IC）的PMIC-穩(wěn)壓器-DCDC開關(guān)式控制器。由制造生產(chǎn)的SG1825CDC-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。