Figure 29. Driving Relays with VCC
參數(shù)資料
型號: SI3225PPTX-EVB
廠商: Silicon Laboratories Inc
文件頁數(shù): 67/112頁
文件大?。?/td> 0K
描述: BOARD EVAL W/DISCRETE INTERFACE
設(shè)計資源: Si3225PPTX-EVB Schematics/Layout
標準包裝: 1
系列: ProSLIC®
主要目的: 接口,模擬前端(AFE)
已用 IC / 零件: Si3225
已供物品: 板,CD
Si3220/25 Si3200/02
58
Rev. 1.3
Not
Recommended
fo
r N
ew
D
esi
gn
s
Figure 29. Driving Relays with VCC > VDD
The maximum allowable RDRV value can be calculated with the following equation:
Where
Q1,MIN ~ 30 for a 2N2222.
Si3220/
Si3225
V
DD
RRDa/b
TRD1a/b
TRD2a/b
V
CC
Polarized
relay
R
DRV
I
DRV
Q1
MaxR
DRV
V
DD,MIN
0.6 V
R
RELAY
Q1,MIN
V
CC,MAX
0.3 V
-------------------------------------------------------------------------------------------------
R
SOURCE
=
Table 32. Recommended RDRV Values
ProSLIC VDD
Relay VCC
Relay RCOIL
Maximum RDRV
Recommended 5% Value
3.3 V ±5%
64
Not Required
5 V ±5%
178
Not Required
3.3 V ±5%
5 V ±5%
178
2718
2.7 k
3.3V ±5%
12V ±10%
1028
6037
5.6 k
3.3V ±5%
24V ±10%
2880
8364
8.2 k
3.3V ±5%
48V ±10%
7680
11092
11 k
5V ±5%
12V ±10%
1028
9910
9.1 k
5V ±5%
24V ±10%
2880
13727
13 k
5V ±5%
48V ±10%
7680
18202
18 k
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