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U2102B

Multifunction Timer IC

Atmel Corporation 

Features

• Integrated Reverse Phase Control

• Mode Selection:

– Zero-voltage Switch with Static Output

– Two-stage Reverse Phase Control with Switch-off

– Two-stage Reverse Phase Control with Dimming Function

• Current Monitoring:

– High-speed Short-circuit Monitoring with Output

– High-current Monitoring with Integrating Buffer

• Integrated Chip Temperature Monitoring

• Adjustable and Retriggerable Tracking Time

• External Window Adjustment for Sensor Input

• Enable Input for Triggering

Multifunction

Timer IC

U2102B

Applications

• Two- or Three-wire Applications

• Motion Detectors

• Time-delay Relays

• Dimmers

• Reverse Phase Controls

• Timers

1. Description

The timer control circuit U2102B is based on bipolar technology. The output stage can

switch either a MOSFET or an IGBT. Two sensor inputs and the retriggerable and

adjustable tracking time useful for a wide range of applications. By using the reverse

phase-control technique, the resistive load can be dimmed without the need of a com-

pensation inductance. The integrated current monitoring function provides a very fast

switch-off in case of a short-circuit condition. No additional fuse is needed.

Rev. 4767B–INDCO–10/05

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