LTC3900_1 Datasheet, PDF (15/20 Pages) Linear Technology – Synchronous Rectifier Driver for Forward Converters

typical applications
36V to 72V Input to 12V, 14A Output Converter in 1/8th Brick Footprint
LTC3900
V_U1 L2
PZTA42
1.5mH
PDZ10B
BAS516
T1
PA0423
1_• 7
6
10 HAT2244
L1
3µH
47k
33µF
10k
82k
V_IN
36V TO 72V
1µF
158k
0.1µF
12.4k
370k
13.3k
133k
82k
22k
20k
47nF
97.6k
LT1952-1
7 _SD/VSEC
3 _ROSC
9 _BLANK
5 _SS
OUT ¹⁴
OC ¹¹
I_SENSE ¹⁰
V_IN ¹⁵
GND ⁸
6 _VR
1 _COMP
PGND ¹³
DELAY ¹²
2 _FB
S_OUT ¹⁶
V_U1
Si7430
2.2µF
2_•
560R
5
1nF
2k
V_U1
4.7µF
0.010
75k
220pF
PE-68386
•
LTC3900
5 _FB
CG ³
8 _{SYNC CS+} 1
6 _GND
470pF _{7 TIMER}
CS^{– 2}
V_CC ⁴
38.3k
10k
1µF
PDZ7.5
BCX55
1k
3900 TA04a
L1: PULSE PA1393.302
L2: COILCRAFT DO1607B-155
ALL CERAMIC CAPS ARE X5R OR X7R
V_OUT
12V
14A
The Efficiency of 12V Output Converter is Over 95% at 8A Output.
96
94
92
90
88
86
84
V_IN = 48V
82
V_OUT = 12V
0 2 4 6 8 10 12 14
I_OUT (A)
3900 TA04b
3900fb
15