XC62EP 데이터 시트보기 (PDF) - TOREX SEMICONDUCTOR

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XC62EP

Boosting Voltage Regulators

TOREX SEMICONDUCTOR 

XC62E Series

■TYPICAL APPLICATION CIRCUIT

●Standard Circuit

PNP Tr

RBE

RB

VIN

EXT

CIN

（Tantalum）

VIN

VOUT

CE

Vss

RＬ

CL

（Tantalum）

External Components:

PNP Tr.: 2SA1213

RBE: 20kΩ ~ 47kΩ

RB: Please refer to Note 2 on the following page.

CIN: 10μF (Tantalum)

CL: 47μF (Tantalum) 10μF minimum

■OPERATIONAL EXPLANATION

Output voltage (VOUT) can be fixed by revising the external transistor's base current. This can be done by comparing the

detected voltage level and the setting voltage power supply level.

With the XC62EP (CE negative voltage), if a voltage above the CE pin's "H" level is applied, the IC will enter stand-by mode

where the base and differential amplifier's currents are regulated.

■NOTES ON USE

1. PNP Transistor

The selection of a transistor should take into account output current, input voltage and power dissipation for each specific

application. It is recommended that a transistor that has a low output saturated voltage (VCE) and high hFE

characteristics be used.

2. RB Resistor

Although the IC unit is protected by a base current remitter circuit, it is recommended that a resistor (RB) be connected

between the transistor's base and the IC's EXT pin to protect the transistor.

Required output current can be calculated using the following equation although characteristic variations and conditions

of use should be carefully checked before use. The following equation also indicates the conditions needed to obtain IOUT

(MAX.) at VIN (MIN.). However, the larger the input current, the larger the output current (IOUT) that can be obtained.

VIN (MIN.)-1.2(V)

RB

0.7(V)

RBE

IOUT (MAX.)

hFE

3. RBE Resistor, CL Capacitor

To prevent oscillation due to output load variation, use of a phase compensation capacitor CL is recommended. Please

use a Tantalum capacitor of at least 10mF. Please also use an RBE resistor of less than 47kΩ.

An RBE resistor of between 20kΩ and 47kΩ is recommended for less power consumption.

4. Input Impedance

In order to control oscillation brought about as a result of impedance at the power supply line, connect a capacitor of

10μF or more (Tantalum) between the external transistor's emitter and the ground pin.

●Protection Circuit

The built-in protection circuit is to protect the IC only. Therefore to prevent output shorts and overshoot current through

the transistor, use of a resistor RB or an overshoot current protection circuit is recommended.

Care should also be taken with the transistor's power dissipation.

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