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