LTC3725 Datasheet, PDF (18/20 Pages) Linear Technology – Single-Switch Forward Controller and Gate Driver

LTC3725
TYPICAL APPLICATIO S
V_IN+
12V
10µF
V_IN–
25V
MMBD914
MMBD914
115k
15k
470pF
10µF
25V
10µF
25V
Si7370DP
×2
100Ω
1nF
1k
3
7
8 ^{NDRV GATE}
V_CC
10
I_S
FB/IN⁺
4
1 _{UVLO LTC3725}
470pF
2
SSFLT
FS/IN^–
1µF
VSLMT PGND GND
33nF ⁹
6 11 _105k
T1
EFD25
1
MURHB860CT
2
3 _{• •} 12
100pF
4
10
1kV
+
110Ω
27µF
5
0.5W
100V
6 _•9
L2
L3
7
100µH 100µH
L1
1.5mH
•
•
1nF
100V
0.010Ω
1.5W
1k
10nF
MOC207 1
–V_S
2.4k 2.4k
0.25W 0.25W
45.3k
1k
1k
10nF
100V
6
47nF
5
2
V⁺
1 ^LT1431 8
COLL REF
2.2nF _9.1V
250V AC
GND-F GND-S
6
5
2.49k
10µF, 25V TDK C3225X7R1E106M (1210)
27µF, 100V SANYO MV-AX
–V_S
1.5µF, 63V FILM WIMA MKS2
2.2nF, 250V AC MURATA GA343QR7GD222KW01L
L1: PULSE PE-53911
L2, L3: TDK SLF12575T-101M1R9
T1: PULSE PA0700 3T(16µH):11:11
+
27µF
100V
1.5µF
63V
FILM
Figure 7. 12V_IN to 48V/1.5A Isolated Forward Converter Using Optoisolator
V_OUT+
48V
1.5A
V_OUT–
3725f
18