SP6125 Datasheet, PDF (9/12 Pages) Sipex Corporation – High-Voltage, Step Down Controller in TSOT6

C6
0.1uF
Q1
2
FDS4685
1
Vin
Gate
Rs 2k
LX
L1, IHLP-2525CZ
8.2uH, 68mOhm, 4A
6
SP6125
3
VDR
Ds
RZ
MBRA340T3G 2K
R1
300k, 1%
GND
5
4
VFB
CZ
47pF
R2
66.5k, 1%
SHDN
D1 1N4148
High=Of f
C1
4.7uF
C4
22uF
VIN
C2
24V
4.7uF
GND
VOUT
C5
22uF
3.3V
0-3A
GND
Figure 4- Application circuit for Vin=24V
TYPICAL PERFORMANCE CHARACTERISTICS
SP6125 Efficiency versus Iout, Vin=24V,Ta=25C
90
80
70
Vout=3.3V
60
50
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Iout (A)
Figure 5- Efficiency at VIN = 24 V , TA= 25˚C, natural convection
Jan28-08 RevG
SP6125: TSOT-6 PFET Buck Controller
9
 2007 Exar Corporation