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Linear - Dual Transistor Synchronous Forward Controller

Numéro de référence LT1681
Description Dual Transistor Synchronous Forward Controller
Fabricant Linear 
Logo Linear 





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LT1681 fiche technique
LT1681
Dual Transistor
Synchronous Forward Controller
FEATURES
s High Voltage: Operation Up to 72V
s Synchronizable Operating Frequency and Output
Switch Phase for Multiple Controller Systems
s Fixed Frequency Operation to 350kHz
s Adaptive and Adjustable Blanking
s Synchronous Rectifier Driver
s Local 1% Voltage Reference
s Undervoltage Lockout Protection with Hysteresis
s Input Overvoltage Protection
s Programmable Start Inhibit
s Transformer Primary Saturation Protection
s Optocoupler Feedback Support
s Soft-Start Control
U
APPLICATIO S
s Isolated Telecommunication Systems
s Personal Computers and Peripherals
s Lead Acid Battery Backup Systems
s Automotive and Heavy Equipment
DESCRIPTIO
The LT®1681 controller simplifies the design of high power
synchronous dual transistor forward DC/DC converters. The
part employs fixed frequency current mode control and
supports both isolated and nonisolated topologies. The IC
drives external N-channel power MOSFETs and operates with
input voltages up to 72V.
The LT1681’s operating frequency is programmable and can
be synchronized up to 350kHz. Switch phase is also con-
trolled during synchronized operation to accommodate mul-
tiple converter systems. Internal logic guarantees 50% maxi-
mum duty cycle operation to prevent transformer saturation.
The LT1681 incorporates a soft-start feature that provides a
controlled increase in supplied current during start-up and
after an undervoltage lockout or overvoltage/overcurrent
event.
The part is available in a 20-lead wide SO package to support
high voltage pin-to-pin clearance.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
36V-72V DC to 5V/7A Synchronous Forward Converter (Half-Brick Footprint)
L1
4.7µH
VIN+
+ C2
22µF
100V
C4
1.5µF
100V
C3
1.5µF
100V
MURS120T3
Q1
MURS120T3
Q3 0.025
1/2W
6
1
7 2 10
3 0.25W
5
1nF
8 10 1nF 100V
4
11 100V 10
12 0.25W
9
T1 Q5
Q6
VIN–
C2:SANYO 100MV22AX
C3, C4: VITRAMON VJ1825Y155MXB
C5: 4X KEMET T510X337KO10AS
L1: COILCRAFT DO1608C-472
L2: PANASONIC ETQP6F4R1LF4
Q1,Q3:100V SILICONIX SUD40N10-25
Q5,Q6: SILICONIX Si4450
T1:COILTRONICS VP5-1200
Q10: ON SEMI MMBT3906LTI
73.2k
270k 1%
0.25W
20k
CMPZ5248B
18V
CMPZ-
5248B
15V
0.1µF
68µF +
20V
10k 56k
1.24k
1nF 24k 1%
ZVN3310F BAT54
1OV
BIAS
MMBD914LT1
0.1µF
100V
10k
330pF
BAS21
20 17 19 18 16 11 12 15
14
2
VCC
VBST
BLKSENS
TG
BSTREF
BG
SENSE
TMAX
PGND
SG
13
OVLO
LT1681
1 SHDN 5VREF FSET THERM SYNC SGND SS VC VFB 9
56
3 7 4 8 10
Q10 52.3k
100
5V
OUT
3.3
0.047µF
3.01k 51
1%
1µF
150pF
4.7nF
0.01µF
1k
1%
1OV
BIAS FZT690
100
4.7µF
16V
CMPZ5242B
12V
8 LTC1693-2 6
VCC1
VCC2
35
IN2 OUT2
1
IN1
7
OUT1
4
GND2
2
GND1
2k
0.22µF
50V
L2
4.1µH
VOUT = 5V
IOUT = 7A
VOUT+
MBR- +
0540T1
C5
330µF
10V
4.7
VOUT–
1681 TA01
1681f
1

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