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71128 Datasheet(PDF) 6 Page - Vishay Siliconix

Part No. 71128
Description  Simple Solution for Dynamically Programming the Output Voltage of DC-DC Converters
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Maker  VISHAY [Vishay Siliconix]
Homepage  http://www.vishay.com
Logo 

   
 6 page
background image
AN731
Vishay Siliconix
www.vishay.com
S FaxBack 408-970-5600
6
Document Number: 71128
28-Jan-00
1
-PSM
PWM
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
-
+
1
U2A
LM358D
1Vx
-
+
U2B
LM358D
7
6
5
JP1
1
2
3
Disable
Enable
1
2
3
JP2
U1
2, 3
TP2
1
GND
P4
1
PGND
1
TP1
2
3
Q1B
Si6801DQ
C5
220 pF
C8
1000 pF
C3
1
mF
R11
3.60 k
W
R10
10 k
W
C10
0.1
mF
+1.3 V
6, 7
8
1
Q1A
Si6801DQ
4
FIGURE 6. Example Circuit Using Si9166 Controller
JP1: PWM/–PSM to VIN for PWM mode;
PWM/–PSM to PGND for PSM mode.
JP2: –SD to VIN for converter enable mode;
–SD to PGND for shutdown mode.
NOTE: VIN must be > VOUT +0.6 V for output regulation
* = Optional
P1
VIN
2.7 – 6 V*
P2
GND
C9
1
mF
TP3
SYNC
Si9166
PWM/PSM
NC
MODE
VOUT
GND
VREF
ROSC
FB
COMP
PGND
VS
DL
SYNC
SD
DL
VDD
R6
3.9 k
W
C7
100 pF
R5
25 k
W
C6
0.1
mF
C4
10
mF
R7*
50
W
C1
0.1
mF
C2
10
mF
L1
1.5
mH
IHLP2525
R1
100
W
R2
22.1 k
W
R3
2 k
W
P3
VOUT
0.4 – 3.4 V
1.2 A
Adjustable
R4
3.01 k
W
R8, 22.1 k
W
R9, 390
W
P5
VA
0.2 – 2.7 V
VIN




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