FEBFHR1200_SPG01A データシートの表示（PDF） - Fairchild Semiconductor

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FEBFHR1200_SPG01A

High-Performance Shunt Regulator

Fairchild Semiconductor 

This user guide supports four applications for the FHR1200. It should be used in

conjunction with the FHR1200 datasheet as well as Fairchild’s application notes and

technical support team. Please visit Fairchild’s website at www.fairchildsemi.com.

1. Introduction

This document describes four proposed applications for the FHR1200 high-performance

shunt regulator. These include:

A. Two each SC70-to-DIP adapters: The small size of the SC70 can make it difficult to

solder to the part for prototyping. Each adapter is supplied with a FHR1200 already

soldered down.

B. A 3.3 V-to-12 V regulated energy-storage-capacitor charger. Some smart meters only

consume around 250 mW 99% of the time so can use a single 3.3 V low-power offline

supply. However, to transmit, they require much higher power for a few milliseconds and

can pull this voltage from a storage capacitor charged to a higher voltage.

C. Voltage regulator and reference: This module can be used with most power supply

topologies and on isolated, non-isolated, primary-side, and floating applications.

D. Low-cost, low-voltage auxiliary regulator: Some designs need a regulated voltage in the

0 to 6 V range at just a few milliamps. The FHR1200 makes it possible to create a low-

cost regulator for this application and can operate with an input voltage to >100 V.

E. Simple VCC or brownout regulator: Many power supply designs require that the VCC

voltage be regulated for the controller. The low operating current, high voltage and wide

temperature range make the FHR1200 a good choice for general regulation applications.

This document contains a general description of the FHR1200, the specifications for each

application circuit, schematics, bill of materials, and the typical operating characteristics.

1.1. Description

The FHR1200 is a high-efficiency regulator that outperforms a typical shunt regulator in

applications where low operating power, wide temperature range, and wide voltage range

are important. The regulator also features better stability and faster response than many

existing regulators.

The FHR1200 can be used for isolated and non-isolated secondary side regulation plus,

primary side, and floating regulation because the regulator can directly drive a power

supply controller. This reduces parts count and circuit complexity in many applications.

Non-isolated secondary-side regulation saves the cost of OPTOs and simplifies the power

supply design.

The FHR1200 can be used in many diverse applications. For example: VCC regulators to

>100 V, small additional auxiliary power supplies, programmable precision Zener diodes

(both high and low power), plus numerous analog circuits.

The FHR1200 can also be used as a standalone, low-cost, thermally stable, ~7.5 V

voltage reference.

© 2014 Fairchild Semiconductor Corporation

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FEBFHR1200_SPG01A • Rev. 1.3

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