芯片管脚资料.doc

LM1431A O PPLICATIONS 应用n Linear Regulators 线性稳压器n Adjustable Power Supplies 可调电源n Switching Power Supplies 开关电源D U ESCRIPTIONS adjustable shunt voltage regulator 可调并联电压调节器By adding two external resistors, the output voltage may be set to anyvalue between 2.5V and 36V.. 通过添加两个外部电阻,输出电压可以设置为任何值介于2.5 v和36 v .A UG WA WU W A R BSOLUTE XI TI SV+, VCOLLECTOR ....................................................... 36VVCOMP, RTOP,RMID,VREF ............................................ 6VGND-F to GND-S .................................................... 0.7VPI FU CTIO SION 管脚功能COLL (Pin 1): Open collector of the output transistor. Themaximum pin voltage is 26V. The saturation voltage at100mA is approximately 1V.1脚（coll）集电极晶体管输出，最大电压输出电压26V，电流为100mA时的饱和电压近似1V。

COMP (Pin 2): Base of the driver for the output transistor.This pin allows additional compensation for complexfeedback systems and shutdown of the regulator. It mustbe left open if unused.2脚（comp）输出端的基本驱动，在复杂的反馈系统和器件关断里，该管脚需要额外的补偿如果不使用时必须悬空V+ (Pin 3): Bias voltage for the entire shunt regulator. Themaximum input voltage is 36V and the minimum tooperate is equal to VREF (2.5V). The quiescent current istypically 0.6mA.3脚（V+）整个分流器的供电部分最大输入电压是36V，应用于开发的最小电压相当于基准电压（2.5V）静态电流是0.6mARTOP (Pin 4): Top of the on-chip 5k-5k resistive dividerthat guarantees 1% accuracy of operation as a 5V shuntregulator with no external trim. The pin is tied to COLL forself-contained 5V operation. It may be left open if unused.See note on parasitic diodes below.4脚（RTOP）芯片里面是5K串联5K的分压电路，当5V的电压分流器没有供电时，确保1%的精确度。

该管脚和1脚一起应用于整个5V电压系统，如果不使用可以悬空，看看下面是否有二极管GND-S (Pin 5): Ground reference for the on-chip resistivedivider and shunt regulator circuitry except for the outputtransistor. This pin allows external current limit of theoutput transistor with one resistor between GND-F (force)and GND-S (sense).5脚（GNDS）接地的端，为了限流可以在GNDS脚和GNDF脚之间连个电阻GND-F (Pin 6): Emitter of the output transistor and substrateconnection for the die.6脚（GNDF）接地RMID (Pin 7): Middle of the on-chip resistive divider stringbetween RTOP and GND-S. The pin is tied to REF for selfcontained5V operation. It may be left open if unused.７脚（ＲＭＩＤ）在芯片上，REF脚和GNDS脚中间点脚，在5V系统里，该脚和REF脚连在一起，如果不用可以悬空。

REF (Pin 8): Control pin of the shunt regulator with a 2.5Vthreshold. If V+ > 3V, input bias current cancellationreduces IB to 0.2mA typical.8脚（REF）整个分流器的控制电压是2.5V，如果Ｖ＋＞３Ｖ，输入将会关断。