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Linear Technology Electronic Components Datasheet

LTC3765 Datasheet

Active Clamp Forward Controller and Gate Driver

No Preview Available !

FEATURES
n Supports Self-Starting Secondary-Side Control
n Direct Flux Limit™ Guarantees No Saturation
n Active Clamp Drive with Delay Adjustment
n On-Chip Bridge Rectifier Eliminates Need for
Separate Gate Drive Bias Supply
n Wide Input Supply Range: 8V and Up (Limited Only
by External Components)
n Linear Regulator Controller for Fast Start-Up
n High Speed Gate Drivers
n Precision UVLO with Adjustable Hysteresis
n Overcurrent Protection
n Overtemperature Protection
n Adjustable Start-Up Frequency and Soft-Start
n Tiny 16-Lead MSOP Package
APPLICATIONS
n Isolated Battery Chargers
n Isolated 48V Telecommunication Systems
n Servers and Embedded Computing
n Automotive and Heavy Equipment
LTC3765
Active Clamp Forward
Controller and Gate Driver
DESCRIPTION
The LTC®3765 is a start-up controller and gate driver for
use in a self-starting secondary-side control forward con-
verter. When combined with the LTC3766 secondary-side
synchronous forward controller, a complete isolated power
supply is created using a minimum of discrete parts. A
proprietary scheme is used to multiplex gate drive signals
and bias power across the isolation barrier through a
small pulse transformer. The LTC3765 contains an on-
chip bridge rectifier that extracts gate drive bias power
from this pulse transformer, eliminating the need for a
separate bias supply. A precision undervoltage lockout
circuit and linear regulator controller ensure a quick and
well-controlled start-up.
The LTC3765 includes an active clamp output for driving an
external PMOS, as well as an adjustable delay to optimize
efficiency. The active clamp architecture reduces voltage
stress on the main power switch, and provides the highest
possible efficiency. Overcurrent protection and the Direct
Flux Limit guarantee no transformer saturation without
compromising transient response.
L, LT, LTC, LTM, PolyPhase, Linear Technology and the Linear logo are registered trademarks
and Direct Flux Limit is a trademark of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents, including 7200014 and
6144194. Other patents pending.
TYPICAL APPLICATION
36V-72V to 5V/15A Active Clamp Isolated Forward Converter
VIN+
36V TO 72V
T1
6:2
••
L1
1.4µH
2.2µF
100V
×3
FDMS86201
33nF
200V
100nF
200V
BSC0901NS
SiR414DP
L1: PULSE PA1393.152
T1: PULSE PA0810
T2: PULSE PA0297
VIN–
365k
1/8W
4.7µF
15k
15mΩ
0.5W
168Ω
3mΩ
2W
100k
Si3440DV
Si3437DV
(SOT-23)
2.2nF
250VAC
100Ω
100Ω
1Ω 1nF
NDRV PG IS+ IS– AG ISMAG
RUN IN+
VCC LTC3765 IN
SSFLT
RCORE
FS/UV
DELAY SGND PGND
33nF 10.5k
14k
0.1µF T2 1.0µF
2:1
••
18.2k
FG SW SG RUN VIN NDRV VCC FS/SYNC VS+ VS–
IS–
IS+
PT+
LTC3766
FB
ITH
PT
SS
GND PGND IPK
SGD FGD MODE
33nF
26.1k 15k 22k
47pF
4.42k
604Ω
470pF
17.8k
For more information www.linear.com/LTC3765
VOUT+
5V
15A
220µF
6.3V
×2
VOUT–
3765 TA01
3765fb
1


Linear Technology Electronic Components Datasheet

LTC3765 Datasheet

Active Clamp Forward Controller and Gate Driver

No Preview Available !

LTC3765
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VCC, NDRV Voltages.................................... –0.3V to 15V
(INN+D,RINV-V, CSCS)FVLoTltVaogleta...g..e..s...........................................................–. –00.3.3VVtoto156VV
ISMAG Voltage................................................. –5V to 18V
RUN Voltage................................................–0.3V to 12V
DELAY, RCORE, FS/UV, IS+, IS– Voltages........ –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3)
LTC3765E,LTC3765I........................... –40°C to 125°C
LTC3765H........................................... –40°C to 150°C
LTC3765MP........................................ –55°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................... 300°C
PIN CONFIGURATION
PGND 1
PG 2
VACGC
3
4
DISEMLIIAASSYG–+
5
6
7
8
TOP VIEW
17
SGND
16
15
IINN–+
14 NDRV
13 SSFLT
12 RUN
11
10
RFSC/OURVE
9 SGND
MSE PACKAGE
16-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 45°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3765EMSE#PBF
LTC3765EMSE#TRPBF 3765
16-Lead Plastic MSOP
–40°C to 125°C
LTC3765IMSE#PBF
LTC3765IMSE#TRPBF 3765
16-Lead Plastic MSOP
–40°C to 125°C
LTC3765HMSE#PBF
LTC3765HMSE#TRPBF 3765
16-Lead Plastic MSOP
–40°C to 150°C
LTC3765MPMSE#PBF
LTC3765MPMSE#TRPBF 3765
16-Lead Plastic MSOP
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VCC = 12V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC Supply
VCCOP
VCCUV
Operating Voltage Range
VCC Undervoltage Lockout
VCC Rising
VCC Falling
Hysteresis
7.7
l 7.1
l 6.7
14.5
7.4 7.7
7.0 7.3
400
V
V
V
mV
VCCLR
Linear Regulator Output Voltage
tr(VCC)
Rise Time of VCC
ICP NDRV Charge Pump Output Current
ICC DC Supply Current
VRF Rectifier Total Forward Drop
Run Control/Undervoltage Lockout (RUN)
(Note 4)
VCC = 5V, VNDRV = 8V
VRUN = 1.5V (Note 5)
ICC = 25mA (Note 6)
8.0 8.5 9.0
35
35
1.7
1
V
µs
µA
mA
V
VRUN
IHYST
IRUN
RUN Pin Threshold
RUN Pin Hysteresis Current
RUN Pin Leakage Current
VRUN Rising
VRUN Falling
VRUN = 1V
VRUN = 1.5V
l 1.22
l 1.17
l 4.0
–10
1.25 1.28
1.20 1.23
5.0 6.0
0 10
V
V
µA
nA
3765fb
2 For more information www.linear.com/LTC3765


Part Number LTC3765
Description Active Clamp Forward Controller and Gate Driver
Maker Linear Technology Corporation
Total Page 24 Pages
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