10/31

CE

Error

Amp

+

-

CEB

each

circuit

ON/OFF

Control

R1

R2

Current Limit

Thermal Shutdown

CE

Soft Start

Voltage

Reference

The XC6702 series controls the output voltage by means of a scheme in which the error amplifier

reference power supply. The output signal from the error amplifier makes the driver transistor

■OPERATIONAL EXPLANATION

XC6702 Series D Type

＜Current limiting, short-circuit protection＞

The XC6702 series incorporates a foldback circuit for current limiting(460mA TYP.) and short-circuit

protection(115mA TYP.).

When the output current reaches the current limit, the output voltage falls and the output current is

limited.

＜Overheating protection＞

The XC6702 series incorporates a thermal shutdown circuit for overheating protection.

When the junction temperature reaches the detection temperature(150℃ TYP.), the driver transistor

is forcibly turned off.

When the junction temperature falls to the release temperature(140℃ TYP.) while the driver

transistor remains in the off state, the driver transistor turns on (auto recovery) and regulation

restarts. Unless the cause of rising temperature is removed, the driver transistor repeats on and off,

and output waveform would be like consecutive pulses.

＜CE pin＞

The XC6702 series allows stopping of the IC internal circuit by a CE pin signal.

As long as the voltage input into the CE pin is within the CE pin voltage specification, the logic is

established and there is no interference with operation.

If the CE pin is left open, operation is unspecified.