SI9121DY-3-T1 VISHAY [Vishay Siliconix], SI9121DY-3-T1 Datasheet - Page 8

• Manufacturer Part Number: SI9121DY-3-T1
• Description: High-Voltage, Non-Isolated Buck-Boost Converter for ISDN Digital Phones
• Manufacturer: VISHAY [Vishay Siliconix]

−10 to −60 V
www.vishay.com
8
Si9121
Vishay Siliconix
V
−10 to −60 V
TYPICAL APPLICATION CIRCUIT
NEG
GND
33 mF
−V
80 V
C1
IN
+
1
0.25
/
R1
2
W
+
33 mF
80 V
C4
Silk Screen
0.1 mF
C5*
0.1 mF
C2*
FIGURE 2. Si9121 Application with External Vcc Through Winding
0.1 mF
C3
0.1 mF
C1
180 pF
C4
FIGURE 1. Typical Applications Circuit
1 mF
C6
R2
75 kW
(27 kW for Si9121DY-3)
0.1 mF
C5
6
3
7
2
1
2
3
4
GND
BYPASS
V
V
CS
V
BYPASS
COMP
CC
NEG
NEG
Si9121DY-5
Si9121DY-3
Si9121DY-5
or
COMP
V
V
COIL
GND
OUT
V
OUT
CS
L
CC
X
8
5
4
1
8
7
6
5
10MQ100N
R1
0.25 W
1
/
68 mH
2
L1
68 mH
Np
W
1 mF
C6
T1
+
220 mF
C2
Ns
180 pF
C7
BAS21
*Optional
D2
10MQ100N
220 mF
10 V
C7
+
S-40708—Rev. C, 19-Apr-04
0.1 mF*
C3
D1
R2
75 kW
(27 kW for Si9121DY-3)
Document Number: 71112
0.1 mF
C8
+
*Optional
GND
V
+5 V/400 mA
or
+3.3 V/400 mA
OUT
@ 400 mA
0.1 mF
+V
GND
+5 V
C8*
OUT