SC450: PowerStep IV® Portable IMVP-IV® And IMVP-IV+® Dual-Phase Power-Supply Controller | Semtech

The SC4431 is a four terminal device for regulating an isolated power supply with output voltages down to 1.5V. It is intended to be used as a replacement for three terminal Shunt Regulators such as SC431L where the output voltage is too low for the device to function in conjunction with an opto-isolator. SC4431 achieves this by having seperate supply and output pins, allowing the output to sink current at voltages as low as 0.1V, while the supply pin still has sufficient voltage for the device to function. In this way, allowing for a 1.4V drop through an opto-isolator Diode regulation down to 1.5V out CAN be achieved. By Semtech Corporation
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SC450 Application circuits
SC450 circuits
This is one application circuit of SC450,If you need more circuits,please download SC450's pdf datasheet.

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