SI9120集成电路（IC）的ACDC转换器离线开关规格书PDF中文资料

SI9120属于集成电路（IC）的ACDC转换器离线开关。由威世科技半导体制造生产的SI9120AC DC 转换器，离线开关该系列是元器件级控制产品，用于构建将交流市电转换为直流电（通常电压大幅降低）的设备。集成和未集成系统主要开关元件的器件均包括在内。由于高输入输出电压比，以及此类系统中通常需要隔离，这些器件通常与外部变压器配合使用。尽管通常使用定制变压器来实现此用途，但也有许多专门用于此用途的库存产品，请参见“开关转换器，SMPS 变压器”标题。

FEATURES

10- to 450-V Input Range

Current-Mode Control

125-mA Output Drive

Internal Start-Up Circuit

Internal Oscillator (1 MHz)

SHUTDOWN and RESET

DESCRIPTION

The Si9120 is a BiC/DMOS integrated circuit designed for use

in low-power, high-efficiency off-line power supplies.

High-voltage DMOS inputs allow the controller to work over a

wide range of input voltages (10- to 450-VDC). Current-mode

PWM control circuitry is implemented in CMOS to reduce

quiescent current to less than 1.5 mA.

A CMOS output driver provides high-speed switching for

MOSFET devices with gate charge, Qg, up to 25 nC, enough

to supply 30 W of output power at 100 kHz. These devices,

when combined with an output MOSFET and transformer, can

be used to implement single-ended power converter

topologies (i.e., flyback and forward).

The Si9120 is available in both standard and lead (Pb)-free

16-pin plastic DIP and SOIC packages which are specified to

operate over the industrial temperature range of −40 C to

85 C.