LTC3765_15 Datasheet, PDF (24/24 Pages) Linear Technology – Active Clamp Forward Controller and Gate Driver

LTC3765
TYPICAL APPLICATION
36V-60V to 14V at 25A Isolated 350W Bus Converter
+V_IN
36V TO 60V
L1
1.8µH
2.2µF
100V
–V_IN
+V_IN
D1
100k
1/8W
FDC2512
1µF ^1nF
14k
11k
66.5k
+V_IN
2.43k
2.2µF
100V
×3
• ^T3
•
I_S+
Q1
Q2
Q3
4mΩ
1W
33nF
200V
ES1PD
0.68Ω
1/8W
100Ω 100Ω
1nF
100Ω
I_S–
I_S+
1nF
PG ISMAG
T1
••
5T 3T
Q4
Q5
165Ω
1/8W
0.22µF
250V
IRF6217
I_S+
432Ω
4.22Ω
1/8W
D5
3.3nF
10k
D2
NPO 33nF
NDRV
V_CC
AG
IN^{+ 0.1µF}
LTC3765
DELAY
RCORE
IN^–
FS/UV
27.4k
33nF
RUN SSFLT
SGND PGND
0.1µF T2
2.5:2
220pF
••
100Ω
2.2nF
250VAC
1µF
27.4k
15.0k
60.4k
150k
10nF
4.7nF _10k
68µF 16V: SANYO 16TQC68M
D1-D2: ZHCS506
D5: BAS21
L1: VISHAY IHLP4040DZER1R8M11
L2: COILCRAFT SER2814L-472KL
Q1-Q3: BSC190N15NS3
Q4-Q7: BSC057N08NS3
T1: PULSE PA0956NL
T2: PULSE PA0510NL
T3: ICE CT102-100 (1:100)
100pF
1.00k
1/8W
SW
FG
SG
V_IN
NDRV
LTC3766
I_S+
V_CC
SS
I_S–
MODE
PT⁺
FB
PT^–
RUN
FGD
V_S+
SGD
V_S–
FS/SYNC REGSD
I_PK
PHASE
ITH
V_SEC
GND PGND
L2
4.7µH
ES1PD
Q6
Q7
EFFICIENCY
36V
60V
5.1k
1W
95.2% AT 25A
95.4% AT 25A
+V_OUT
22µF +
14V
68µF 25A
16V
16V
×4
×4
10nF
200V
–V_OUT
FCX491A
4.7µF
+V_OUT
604Ω
13.7k
+V_OUT
3765 TA02
RELATED PARTS
PART NUMBER
LTC3766
DESCRIPTION
Secondary Side Synchronous Forward Controller
LTC3705/LTC3726
LT1952/LT1952-1
LTC3723-1/LTC3723-2
LTC3721-1
LTC3722/LTC2722-2
Isolated Synchronous No Opto 2-Switch Forward
Controller Chip Set
Isolated Synchronous Forward Controllers
Synchronous Push-Pull and Full-Bridge Controllers
Nonsynchronous Push-Pull and Full-Bridge Controllers
Synchronous Isolated Full Bridge Controllers
COMMENTS
Direct Flux Limit, Multiphase Capable, Works in Conjunction with
LTC3765
Suitable for Medium Power 24V and 48V Input Applications
Suitable for Medium Power 24V and 48V Input Applications
High Efficiency with On-Chip MOSFET Drivers
Minimizes External Components, On-Chip MOSFET Drivers
Suitable for High Power 24V and 48V Input Applications
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95_F0_o3_r5_m-7_o4_re1_i7_{nformation www.linear.com/LTC3765}
[phone] ^● FAX: [phone] ^● www.linear.com/LTC3765
3765fb
LT 1113 REV B • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2011