U2100B View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

U2100B

Timer Control for Triac and Relay

Atmel Corporation 

U2100B

3.1 Mode Selection Pin 4 and Supply Voltage Pin 2

The operational modes can be selected by the external voltage at the synchronous input pin 4

(clamping). The mode selection determines the current requirement of the relay's or triac's driver

stage and hence the selection of the supply voltage.

3.2 Zero Voltage Switch Operation (Figure 3-3 on page 6)

Selection condition:

V4 = internal synchronous limitation, without external clamping

R1 ≈

0.85

V-----M-----–-----V----S-

2 Itot

Itot = IS + Ip + IX

where:

IS

= Supply current of the IC without load

IP

= Average trigger current IG

IX

= External circuit current requirement

VM

= Mains voltage

Required firing pulse width tp

tp

=

2-ω- arcsin

⎛

⎝

-IP-L----×-×-----V-----M2--⎠⎞

where:

IL

P

= Triac latching current

= Power at load Z

Rsync[kΩ] ≈

V-----M----[--V----]---×----------2---s----i-n-----(---ω----×------t--p---[-s---]--)----–-----0---.--7- – 176

1.8 × 10-2

5

4769C–INDCO–07/05

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