Si3230
VDC
F1
SDCH
R19
1
Note 1
SDCL
R20
1
R18
1
C25
2
10uF
C14
2
0.1uF
Si3230
C10
0.1 µF
R16
200
Q7
FZT953
DCFF
Q8
2N2222
D1
ES1D
C9
10uF
VBAT
R17
L1
DCDRV
Note 1
GND
Notes:
1. Values and configurations for these components can be derived from
Table 17 or from App Note 45.
2. Voltage rating for C14 and C25 must be greater than VDC.
Figure 4. Si3230 DC-DC Converter Circuit
Table 12. Si3230 DC-DC Converter Component Values
Component (s)
C9
C10
C14*
C25*
R16
R17
R18
R19,R20
F1
D1
L1
Value
10 µF, 100 V, Electrolytic, ±20%
0.1 µF, 50 V, X7R, ±20%
0.1 µF, X7R, ±20%
10 µF, Electrolytic, ±20%
200
Ω,
1/10 W, ±5%
1/10 W, ±5% (See AN45 or Table 17 for value selection)
1/4 W, ±5% (See AN45 or Table 17 for value selection)
1/10 W, ±1% (See AN45 or Table 17 for value selection)
Fuse
Ultra Fast Recovery 200 V, 1A Rectifier
1A, Shielded Inductor (See AN45 or
120 V, High Current Switching PNP
60 V, General Purpose Switching NPN
Belfuse SSQ Series
General Semi ES1D; Central Semi
CMR1U-02
API Delevan SPD127 series, Sum-
ida CDRH127 series, Datatronics
DR340-1 series, Coilcraft DS5022
Zetex FZT953, FZT955, ZTX953,
ZTX955
ON Semi MMBT2222ALT1,
MPS2222A; Central Semi
CMPT2222A; Zetex FMMT2222
Supplier
Panasonic
Murata, Johanson, Novacap, Venkel
Murata, Johanson, Novacap, Venkel
Panasonic
Q7
Q8
*Note:
Voltage rating of this device must be greater than V
DC
.
Preliminary Rev. 0.96
13
SILABS [ SILICON LABORATORIES ]
