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71128 Datasheet(PDF) 5 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
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 5 page
background image
AN731
Vishay Siliconix
Document Number: 71128
28-Jan-00
www.vishay.com
S FaxBack 408-970-5600
5
P1
1
JP1
Enable
Disable
Converter
JP2
–PSM
PWM
PWM/PSM
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
P2
1
GND
SYNC
+1.3 V
Si9165
1
1
P4
PGND
-
+
1
U2A
LM358D
1
U1
-
+
U2B
LM358D
7
NC
6
5
L1
JP1: –SD to VIN for converter enable mode;
–SD to PGND for shutdown mode.
JP2: PWM/–PSM to VIN for PWM mode;
PWM/–PSM to PGND for PSM mode.
NOTE: VIN must be > VOUT +0.6 V for output regulation
* = Optional
FIGURE 5. Schematic of Design Example, Using Si9165 Converter
VIN
C10
0.1
mF
R10
10 k
W
R9, 390
W
R8, 22.1 k
W
R11
3.60 k
W
P5
VA
0.2 – 2.7 V
C5
0.1
mF
C1
100 pF
C6
1 nF
R6
3.9 k
W
R3
25 k
W
C2
0.1
mF
VDD
C4
220 pF
R4*
50
W
VX
R5
1 k
W
R1
22.1 k
W
1%
R2
3.01 k
W
1%
P3
VOUT
0.4 – 3.4 V
600 mA
Adjustable
C3
10
mF
VDD
VIN
2.7 – 6 V
C8
0.1
mF
C7
10
mF
1.5
mH
SD
NC
COIL
COIL
MODE
VIN/OUT
VS
SYNC
VO
GND
VDD
VREF
ROSC
FB
COMP
VIN/OUT
VIN/OUT
PGND
PGND




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