Datasheet

LTC3766
54
3766fa
For more information www.linear.com/LTC3766
18V-75V to 12V/12.5A Active Clamp Isolated Forward Converter
Typical applicaTions
Efficiency vs Load Current
SGND PGND
GND PGND
LTC3766
SW SG
I
S
–
I
S
+
RUN
10nF
220pF
47pF
1µF
D1
+V
IN
–V
IN
33nF
27.4k
100Ω
13.3k
61.9k
4.99k
68µF 16V: SANYO 16TQC68M
D1-D2: ZHCS506
D3: BAS21
L1: VISHAY IHLP4040DZER1R8M11
L2: PULSE PA2729.113NL
Q1: FDMS86201
Q2: BSC057N08NS3
Q3: BSC190N15NS3
T1: PULSE PA0801
T2: PULSE PA0510NL
T3: ICE CT102-100 (1:100)
SSFLT
15k
60.4k
1.82k
604Ω
75k
10k
16.9k
1.87k
3766 TA04a
11.5k
RCORE FS/UV
6.19k
10k
IRF6217
Q1
0.22µF
250V
2.2µF
100V
×3
2.2µF
100V
0.75Ω
1/8W
5.11Ω
1/8W
DELAY IN
–
V
CC
PT
+
FB
MODE
SS I
S
–
PT
–
FGD
SGD
FS/SYNC
I
PK
ITH V
SEC
PHASE
REGSD
V
S
–
V
S
+
RUN
IN
+
NDRV
FDC2512
AG
PG
100Ω
ES1PD
100Ω
100Ω
4mΩ
1W
75Ω
1/8W
33nF
200V
T1T3
D3
I
S
+
+V
IN
18V TO 75V
1.2k
1/8W
L1
1.8µH
4T
Q2
Q3
+V
OUT
12V
12.5A
–V
OUT
+V
OUT
+V
OUT
4T
ISMAG
+V
IN
2.2nF
250VAC
10nF
0.1µF
T2
2.5:2
1nF
D2
1µF
3.3nF
I
S
+
V
CC
NDRV
FG V
IN
10µF
33nF NPO
I
S
+
1nF
LTC3767
0.1µF
200k
1nF
68µF
16V
×2
••
•
•
••
L2
11µH
ES1PD
22µF
16V
×2
1.82k
1/4W
33k
1/2W
1.82k
1/4W
+
FMMT491
1nF
200V
51Ω
1/2W
100pF
200V
LOAD CURRENT (A)
0
EFFICIENCY (%)
92
94
96
12
3766 TA04b
90
88
86
3
6
9
15
V
IN
= 24V
V
IN
= 48V