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UM0422 数据表(PDF) 9 Page - STMicroelectronics

部件名 UM0422
功能描述  Constant current controller for high brightness LEDs
PDF  14 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

UM0422 数据表(HTML) 9 Page - STMicroelectronics

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UM0422
Schematic and bill of materials
9/14
5
Schematic and bill of materials
5.1
Schematic
Figure 4.
Schematic - power section
This subcircuit is present on the evaluation board only if the LED is mounted (see the
highlighted blue box in Figure 4).
Figure 5.
Schematic - PWM oscillator
R4 10k
R3 6.8k
R2
18k
R1 18k
+
3
-
2
OUT
1
U2A
TS3702
2
R9
Pot 10k
1
3
R8 Pot 1MEG
R7 10k
R6
330
R5
1.8k
5V
0
0
5V
C1 22nF
0
+
5
-
6
OUT
7
U2B
TS3702
0
R10 220k
5V
0
VCC
C8
100nF
0
C9
100nF
0
PWM



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