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LT1681ISW Datasheet

  • LT1681ISW

  • Dual Transistor Synchronous Forward Controller

  • 20頁

  • LINER

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FEATURES
s
s
LT1681
Dual Transistor
Synchronous Forward Controller
DESCRIPTIO
The LT
廬
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鈥檚 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.
s
s
s
s
s
s
s
s
s
s
High Voltage: Operation Up to 72V
Synchronizable Operating Frequency and Output
Switch Phase for Multiple Controller Systems
Fixed Frequency Operation to 350kHz
Adaptive and Adjustable Blanking
Synchronous Rectifier Driver
Local 1% Voltage Reference
Undervoltage Lockout Protection with Hysteresis
Input Overvoltage Protection
Programmable Start Inhibit
Transformer Primary Saturation Protection
Optocoupler Feedback Support
Soft-Start Control
APPLICATIO S
s
s
s
s
Isolated Telecommunication Systems
Personal Computers and Peripherals
Lead Acid Battery Backup Systems
Automotive and Heavy Equipment
TYPICAL APPLICATIO
L1
4.7碌H
V
IN+
36V-72V DC to 5V/7A Synchronous Forward Converter (Half-Brick Footprint)
L2
4.1碌H
6
Q1
MURS120T3
C2
22碌F
100V
C3
1.5碌F
100V
V
IN鈥?/div>
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
1%
270k
0.25W
20k
CMPZ-
5248B
15V
C4
1.5碌F
100V
MURS120T3
7
5
8
4
0.025鈩?/div>
1/2W
9
T1 Q5
鈥?/div>
+
鈥?/div>
鈥?/div>
Q3
鈥?/div>
ZVN3310F
BAT54
1OV
BIAS
MMBD914LT1
0.1碌F
100V
10k
330pF
5V
OUT
3.3鈩?/div>
0.047碌F
8
1OV
BIAS
BAS21
14
20
17
19
18
16
11
12
15
V
CC
V
BST
BLKSENS TG BSTREF BG SENSE T
MAX
PGND 13
SG
2
LT1681
OVLO
9
1
THERM SYNC SGND SS V
C
V
FB
SHDN 5V
REF
F
SET
6
5
52.3k
1碌F
150pF
3
7
4
8
10
100鈩?/div>
4.7nF
0.01碌F
CMPZ5248B
18V
0.1碌F
10k
1nF 24k
56k
1.24k
1%
3.01k
1%
1k
1%
51鈩?/div>
+
68碌F
20V
Q10
LTC1693-2
6
V
CC1
V
CC2
5
3
IN2
OUT2
7
1
IN1
OUT1
2
4
GND2
GND1
U
U
U
V
OUT
= 5V
I
OUT
= 7A
V
OUT+
1
2
3
10鈩?/div>
0.25W
1nF
100V
10
1nF
11
100V
10鈩?/div>
0.25W
12
MBR-
0540T1
Q6
+
C5
330碌F
10V
4.7鈩?/div>
V
OUT鈥?/div>
100鈩?/div>
FZT690
4.7碌F
16V
CMPZ5242B
12V
2k
0.22碌F
50V
1681 TA01
1681f
1

LT1681ISW 產(chǎn)品屬性

  • LT1681

  • 38

  • 集成電路 (IC)

  • PMIC - 電源控制器，監(jiān)視器

  • -

  • 同步正向控制器

  • 72V

  • 9 V ~ 18 V

  • 17mA

  • -40°C ~ 85°C

  • 表面貼裝

  • 20-SOIC（0.295"，7.50mm 寬）

  • 20-SOIC

  • 管件

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