U2100B View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

U2100B

Timer Control for Triac and Relay

Atmel Corporation 

U2100B

3.4 αmin Operation

Selection condition (Figure 3-5):

–V4 = 6.5 to 7.8V, +V4 = internal limitation

Rαmax

=

Rsync

--------------3---.--6-----V----------------

VR(peak) – 3.6 V

Rαmin

=

Rsync

---------------1---0-----V-----------------

VM × 2 – 10 V

VR(peak) is the peak voltage of the remaining phase angle, which should be high enough to gener-

ate the supply voltage, VS.

Figure 3-5. αmin Operation (Two-wire Operation)

D1

2

IN 4007 C0

R0

Z

-VS

L

C1

22 V

4

Sync

Rα

3

Output

1

GND

Rsync

1N4148

6.8 V

RG

IG

VM

230 V~

VR(peak)

N

C1

Co

Ro

Rsync

Rα

RG

D1

=

100 µF/35V

=

0.33 µF/250V ~

=

390Ω

=

220 kΩ

=

10 kΩ

=

390Ω

=

IN 4007

7

4769C–INDCO–07/05

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