Datasheet

LTC3766
60
3766fa
For more information www.linear.com/LTC3766
 LINEAR TECHNOLOGY CORPORATION 2011
LT 0613 REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com/LTC3766
relaTeD parTs
Typical applicaTion
PART NUMBER DESCRIPTION COMMENTS
LTC3765 Active Clamp Forward Controller and Gate Driver Direct Flux Limit, Supports Self-Starting Secondary Forward Control, Works
in Conjuction with LTC3766
LTC3705/LTC3726 2-Switch Synchronous Forward No Opto Isolated
Controller Chip Set
Self-Starting Architecture Eliminates Need for Bias Voltage on Primary Side
LT
®
1952/LT1952-1 Isolated Synchronous Forward Active Clamp
Contollers
Suitable for Medium Power 12V, 24V and 48V Input Applications, Adjustable
Synchronous Rectification Timing
LTC3723/LTC3723-2 Synchronous Push-Pull and Full-Bridge
Controllers
High Efficiency with On-Chip MOSFET Drivers, Adjustable Synchronous
Rectification Timing
LTC3721-1/LTC3721-2 Nonsynchronous Push-Pull and Full-Bridge
Controllers
Minimizes External Components, On-Chip MOSFET Drivers
LTC3722/LTC3722-2 Synchronous Isolated Full-Bridge Controllers Adaptive or Manual Delay Control for Zero Voltage Switching, Adjustable
Synchronous Rectification Timing
36V-72V to 3.3V/20A Nonisolated Resonant-Reset Forward Converter
+
Si2328DS
(SOT23)
BSC320N20NS3
NDRV
FS/SYNC ITH
SS
I
S
–
I
S
+
PT
+
V
AUX
FG SW SG
33nF
1µF
16V
0.1µF
50V
1nF
V
CC
V
IN
RUN
V
SOUT
FB
V
S
–
V
S
+
REGSD
0.22µF
1.5nF
200V
NPO
V
IN
36V TO 72V
47pF
2.2nF
–SENSE
+SENSE
8.62k
16.2k
16.5k
1/4W
100Ω
15mΩ
1W
100Ω
L2
1mH
L1
0.85µH
2.4Ω
1/4W
L1: PULSE PA1294.910NL
L2: COOPER SD25-102
T1: PULSE PA0810.006NL
1nF
50V
210k
7.87k
GND PGND
LTC3766
330pF
V
SEC
SGD
49.9k
MODE
20.5k 6.2k
1.82k
100Ω
3766 TA07
100Ω
I
PK
2.2µF
100V
×3
1µF
12T
6T
2T
T1
BAT54
BAT54
BSC0901NS
BSC0901NS
V
OUT
3.3V
20A
220µF
6.3V
100µF
6.3V
×2
•
•
•
Load StepEfficiency vs Load Current Start-Up
LOAD CURRENT (A)
6
86
EFFICIENCY (%)
88
90
92
94
8 10 12 14
3766 TA07b
16 18 20
V
IN
= 36V
V
IN
= 48V
V
IN
= 72V
V
OUT
1V/DIV
I
L
5A/DIV
1ms/DIV
3766 TA07c
V
IN
= 48V
V
OUT
= 3.3V
R
LOAD
= 0.22Ω
V
OUT
200mV/DIV
I
OUT
5A/DIV
20µs/DIV
3766 TA07d
V
IN
= 48V
V
OUT
= 3.3V
LOAD STEP = 10A TO 20A