SG1845Y-DESC中文资料Space-grade Power Management数据手册Microchip规格书

描述 Description

Cross reference to 5962-8670404PA, 5962-8670404, 8670404Features:
• 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
• HYSTERESIS (SG1844 only)
• DOUBLE PULSE SUPPRESSION
• HIGH-CURRENT TOTEM-POLE OUTPUT
• INTERNALLY TRIMMED BANDGAP REFERENCE
• 500kHz OPERATION
• UNDERVOLTAGE LOCKOUT SG1844 - 16 volts SG1845 - 8.4 volts
• LOW SHOOT-THROUGH CURRENT <75mA OVER TEMPERATURE The SG1844/45 family of control ICs 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, pulse-by-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 SG1844/45 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. Both operate up to a maximum duty cycle range of zero to <50% due to an internal toggle flip-flop which blanks the output off every other clock cycle. The SG1844/45 is specified for operation over the full military ambient temperature range of -55°C to 125°C. The SG2844/45 is specified for the industrial range of -25°C to 85°C, and the SG3844/45 is designed for the commercial range of 0°C to 70°C.

简介

SG1845Y-DESC属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由制造生产的SG1845Y-DESCDC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。