T2117 查看數據表（PDF） - Atmel Corporation

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T2117

Zero-voltage Switch with Adjustable Ramp

Atmel Corporation 

6. Supply Voltage

The T2117 contains a voltage limiting funtion and can be connected with the mains supply via

the diode D1 and the resistor R1. The supply voltage between pin 5 and 7 is limited to a typical

value of 9.5 V.

The series resistance R1 can be calculated as follows (Figure 6-1 on page 6 and Figure 6-2 on

page 7):

R1max

=

0.85

-V----M----m----i-n----–----V----S----m---a---x-

2 Itot

;

P(R1)

=

(---V----M------–----V----S----)--2-

2 R1

Itot

= IS + IP + Ix

where

VM = Mains voltage

VS = Limiting voltage of the IC

Itot = Total current consumption

IS = Current requirement of the IC (without load)

Ix = Current requirement of other peripheral components

P(R1) = Power dissipation at R1

Figure 6-1. Maximum Resistance of R1

50

40

VMains = 230 V~

30

20

10

0

0

3

6

9

Itot (mA)

12

15

6 T2117

4768B–INDCO–10/05

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