Datasheet

D1
VIN SW
FB
GND
CTRL
COMP
D2
D3
D4
Q1
Q2
VIN
L1: TOKOB992AS-330M
C1: MurataGRM188R61A475K
C2, C3: MurataGRM21BR71H105K
C4, C5: MurataGRM32ER71H475K
D1 – D4: B140
Q1: BCM62B
Q2: MMBT3904TT1
Vo2 = 1.23 x (R1/ R2); Vo1 = 2Vo2
VIN3.3V
C1
4.7 Fm
L1
33 Hm
10nF
10kW
TPS61170
C2
1 Fm
C3
1 Fm
C4
4.7 Fm
V
-48V/30mA
O
1
V
-24V/40mA
O
2
R1
23.7kW
C5
4.7 Fm
1kW
1kW
R2
1.24kW
VIN SW
FB
GND
CTRL
COMP
10nF
L1: EPCOSN97
C1: MurataGRM21BR61E475K
C2: MurataGRM32ER71H475K
D1: MURA160
D1
Vo = 1.23x (R1+R2)/ R2;
1 10 2 9 3 8
VIN12V
L1
15 Hpins1-10m
C2
4.7 Fm
V
48V/75mA
O
39pF
5.6 W
R2
2.61kW
R1
100kW
TPS61170
C1
4.7 Fm
60kW
TPS61170
www.ti.com SLVS789C – NOVEMBER 2007– REVISED APRIL 2011
Figure 23. –24V / –48V Buck-Boost Converter from 3.3-V Input
Figure 24. 12V to 48V Flyback Topology
Copyright © 2007–2011, Texas Instruments Incorporated 21