SG1842Y数据手册集成电路（IC）的ACDC转换器离线开关规格书PDF

描述 Description

The SG1842/43 family of control IC's provides all the necessary features to implement off-line fixed frequency, current-mode switching power supplies with a minimum number of external components. Current-mode architecture demonstrates improved line regulation, improved load regulation, pulseby- pulse current limiting and inherent protection of the power supply output switch. The bandgap reference is trimmed to ±1% over temperature. Oscillator discharge current is trimmed to less than ±10%. The SG1842/43 has under-voltage lockout, current limiting circuitry and start-up current of less than 1mA. The totem-pole output is optimized to drive the gate of a power MOSFET. The output is low in the off state to provide direct interface to an N channel device. The SG1842/43 is specified for operation over the full military ambient temperature range of -55°C to 125°C. The SG2842/43 is specified for the industrial range of -25°C to 85°C, and the SG3842/43 is designed for the commercial range of 0°C to 70°C. KEY FEATURES·Optimized for off-line control·Low start-up current (<1mA)·Automatic feed forward compensation·Trimmed oscillator discharge current·Pulse-by-pulse current limiting·Enhanced load response characteristics·Under-voltage lockout with 6V Hysteresis (SG1842 only)·Double-pulse suppression·High-current totem-pole output (1AMP PEAK)·Internally trimmed bandgap reference·500kHZ operation·Undervoltage lockout SG1842 - 16 volts and SG1843 - 8.4 volts·Low shoot-through current <75mA over temperature HIGH RELIABILITY FEATURES·Available to MIL-STD-883B and DSCC·Scheduled for MIL-M38510 QPL listing·Radiation data available·Microsemi level \"S\" processing available

简介

SG1842Y属于集成电路（IC）的ACDC转换器离线开关。由制造生产的SG1842YAC 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。