參數(shù)資料
型號： LT1681ISW
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Dual Transistor Synchronous Forward Controller
中文描述： SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO20
封裝： 0.300 INCH, PLASTIC, SO-20
文件頁數(shù)： 1/20頁
文件大小： 308K
代理商： LT1681ISW
1
LT1681
1681f
APPLICATIU
DESCRIPTIOU
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.
FEATURES
TYPICAL APPLICATIOU
Dual Transistor
Synchronous Forward Controller
I
Isolated Telecommunication Systems
I
Personal Computers and Peripherals
I
Lead Acid Battery Backup Systems
I
Automotive and Heavy Equipment
I
High Voltage: Operation Up to 72V
I
Synchronizable Operating Frequency and Output
Switch Phase for Multiple Controller Systems
I
Fixed Frequency Operation to 350kHz
I
Adaptive and Adjustable Blanking
I
Synchronous Rectifier Driver
I
Local 1% Voltage Reference
I
Undervoltage Lockout Protection with Hysteresis
I
Input Overvoltage Protection
I
Programmable Start Inhibit
I
Transformer Primary Saturation Protection
I
Optocoupler Feedback Support
I
Soft-Start Control
, LTC and LT are registered trademarks of Linear Technology Corporation.
36V-72V DC to 5V/7A Synchronous Forward Converter (Half-Brick Footprint)
V
CC
OVLO
14
2
1
5
52.3k
1
μ
F
150pF
SHDN
73.2k
1%
20k
10k
270k
0.25W
68
μ
F
20V
5V
REF
6
F
SET
4.7nF
8
SS
10
100
15
BAT54
ZVN3310F
9
V
C
PGND
V
FB
3
7
4
THERM
LT1681
SYNC SGND
1k
1%
100
2k
0.22
μ
F
50V
FZT690
4.7
μ
F
16V
CMPZ5242B
12V
3.3
10k
0.01
μ
F
13
SG
+
0.1
μ
F
11
SENSE
16
BG
18
BSTREF
19
TG
BLKSENS
T
MAX
20
BAS21
0.1
μ
F
100V
V
BST
C4
1.5
μ
F
100V
C3
1.5
μ
F
100V
L1
4.7
μ
H
0.025
1/2W
Q3
1nF
100V
1nF
100V
10
0.25W
Q5
Q6
MURS120T3
MURS120T3
Q1
V
IN+
V
IN–
C2
22
μ
F
100V
V
OUT+
V
OUT–
C5
330
μ
F
10V
10
0.25W
L2
4.1
μ
H
330pF
+
1.24k
1%
4
5
6
V
CC1
IN2
IN1
GND2
V
CC2
OUT2
OUT1
GND1
8
3
1
4
6
5
7
2
LTC1693-2
1OV
BIAS
1OV
BIAS
MBR-
0540T1
MMBD914LT1
5V
OUT
3.01k
1%
51
0.047
μ
F
7
8
9
1
2
3
10
11
12
1nF
4.7
+
1681 TA01
56k
12
17
CMPZ5248B
18V
CMPZ-
5248B
15V
Q10
24k
T1
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
V
OUT
= 5V
I
OUT
= 7A
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1681ISW#PBF 功能描述:IC SYNCHRONOUS FWRD CTRLR 20SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LT1681ISW#TR 功能描述:IC SYNCHRONOUS FWRD CTRLR 20SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LT1681ISW#TRPBF 功能描述:IC SYNCHRONOUS FWRD CTRLR 20SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LT1682 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower Low Dropout Regulators with Shutdown
LT1683 制造商:LINER 制造商全稱:Linear Technology 功能描述:Ultralow Noise Push-Pull DC/DC Controller
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