SI786 Vishay, SI786 Datasheet - Page 10

• Manufacturer Part Number: SI786
• Description: Dual-output Power-supply Controller
• Manufacturer: Vishay

Si786
Vishay Siliconix
www.vishay.com
10
SCHEMATIC DRAWINGS
Note 1: Use short, Kelvin-connected
PC board traces placed very
close to one another.
at 3 A
150 mF
3.3 V
5.5 V to 30 V
C7
150 mF
INPUT
C12
3.3 V ON/OFF
SHUTDOWN
5 V ON/OFF
25 mW
OSC SYNC
1.65 V
1.65 V
SHDN
SYNC
R1
REF
22 mF
V+
V
D
D
L
1
2
C1
D1FS4
(Note 1)
10 mH
D1
L1
0.01 mF
300 kHz/200 kHz
N1
N3
Reference
Regulator
C9
5-V LDO
ON
Oscillator
Linear
3.3-V
FIGURE 1. Si786 Application Circuit
1N4148
2.8 V
0.1 mF
FIGURE 2. Si786 Block Diagram
D2A
C5
4 V
ON
C3
1 mF
23
25
27
26
24
28
13
12
11
10
1
2
3
9
100 W
STANDBY
V+
BST
DH
LX
DL
CS
FB
SS
ON
ON
SHDN
SYNC
GND
REF
3
3
3
3
3
3
3
5
0.1 mF
Si786
3
4.5 V
PGND
BST
DH
CS
SS
LX
DL
FB
V
D
Q
Q
V
D
5
H
L
5
5
5
5
5
5
1
1
2
2
22
18
16
17
19
15
21
14
20
6
4
8
5
7
0.1 mF
D2B
1N4148
C4
(See Figure 3)
(See Figure 3)
Controller
C8
0.01 mF
Controller
PWM
3.3-V
PWM
N2
N3
ON
5-V
ON
(Note 1)
10 mH
COMPARATOR SUPPLY INPUT
IN
OUT
IN
OUT
3.3 V at 5 mA
L2
D1
D1FS4
COMPARATOR 1
COMPARATOR 2
C10
22 mF
10 mF
25 mW
R2
FB
CS
BST
DH
LX
DL
SS
PGND
ON
FB
CS
BST
DH
LX
DL
SS
ON
V
Q
Q
H
1
2
5 V at 5 mA
3
3
3
5
5
5
3
5
3
3
3
5
5
5
3
5
C6
330 mF
5 V at
3 A
S-40807—Rev. J, 26-Apr-04
Document Number: 70189