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AS273D1D13

Over-Temperature Detector

Astec Semiconductor => Silicon Link 

AS273

Over-Temperature Protection with

Latch (Low Current)

The diagram of Figure 13 illustrates how a power

supply can be shut down with a simple two-

transistor latch. When the programmed over-

temp is reached, the open collector output of the

AS273 enables the latch and pulls VCC below the

under-voltage threshold of the AS3842, shutting

off the AS3842. The latch can be disabled only

with a power reset.

Over-Temperature Detector

COMP

VREG

VFB

VCC

SENSE

OUT

RT/CT

GND

AS3842

R1

1k

REF

OUT

AS273

GND

VCC

ICC = 400 mA

MAX.

R2

+

350 Ω

R3

350 Ω

Figure 13.

Over-Temperature Protection with

Hysteresis

In this over-temperature circuit, the hysteresis of

the AS273 is used to automatically restart the

power supply after the temperature drops below

the hysteresis temperature window. R1 supplies

the current to power the AS273 after the AS3842

and the power supply are shut down. R2 and

the external zener set the over-temperature trip

point.

V BULK

R1

R2

REF

OUT

AS273

GND

COMP

VREG

VFB

VCC

SENSE

OUT

RT/CT

GND

AS3842

Figure 14.

ASTEC Semiconductor

10

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