HI-SINCERITY

MICROELECTRONICS CORP.

Spec. No. : Preliminary Data

Issued Date : 2001.01.01

Revised Date : 2001.05.21

Page No. : 1/3

H78M12AT, H78M12BT

HSMC Product Specification

H78M12AT

H78M12BT

3-TERMINAL POSITIVE VOLTAGE REGULATOR

Description

The H78M12_T series of three-terminal positive regulators are available in

the TO-126 package. This regulator can provide local on-card regulation,

eliminating the distribution problems associated with single point regulation. Each device employs internal

current limiting, thermal shut-down and safe operating area protection, making it essentially indestructible.

If adequate heat sinking is provided, they can deliver over 0.5A output current. Although designed primarily

as fixed voltage regulators, this device can be used with external components to obtain adjustable

voltages and currents.

Description

• Output current up to 500mA is available.

• Eliminates external compensating circuit.

• Built-in current limiter prevents elements from destruction when load is short circuit.

• Built-in chip junction temperature limiting circuit protects elements against thermal destruction.

• Built-in internal power dissipation limiting circuit protects transistors at output driver.

°C)

• Input Voltage................................................................................................................................... 35 V

• Total Power Dissipation (Tc=25°C) ................................................................................ Internally limited

• Operating Junction Temperature ...................................................................................... 0 °C to 125 °C

• Output Current (Tc=25°C) .............................................................................................................. 0.5 A

• Lead Temperature (Soldering 10S) .............................................................................................. 230 °C

Typical Application

Block Diagram

H78M12_T

Vout

Vin

3

1

2

C1

C2

Note :

C1 and C2 are required if regulator is

located far from power supply filter

and load, or oscillation may induced

on the loop.

Current

Generator

Reference

Voltage

Starting

Circuit

Error

Amplifier

SOA

Protection

Thermal

Protection

Series pass

Element

Input

1

Output

3

GND

2