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參數(shù)資料
| 型號： | LT3781IG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Bootstrap Start Dual Transistor Synchronous Forward Controller |
| 中文描述： | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 5.30 MM, PLASTIC, SSOP-20 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 267K |
| 代理商： | LT3781IG |
1
LT3781
3781i
V
CC
OVLO
13
2
1
5
1
μ
F
150pF
SHDN
73.2k
1%
20k
10k
270k
0.25W
68
μ
F
20V
5V
REF
6
FSET
4.7nF
8
SS
10
100
14
BAT54
ZVN3310F
9
V
C
PGND
V
FB
3
7
4
THERM
LT3781
SYNC SGND
52.3k
1k
1%
100
2k
0.22
μ
F
50V
FZT690
4.7
μ
F
16V
CMPZ5242B
12V
3.3
10k
0.01
μ
F
12
SG
+
0.1
μ
F
11
SENSE
15
BG
18
BSTREF
19
TG
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
R9
0.025
1/2W
Q3
1nF
100V
1nF
100V
10
0.25W
Q5
Q6
MURS120T3
MURS120T3
Q1
T1
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
V
OUT
= 5V
I
OUT
= 7A
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
+
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
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
High Voltage Operation up to 72V
I
Synchronizable Operating Frequency and Output
Switch Phase for Multiple Controller Systems
I
Synchronous Switch Output
I
Undervoltage Lockout Protection with 6V Hysteresis
for Self-Biased Power
I
Fixed Frequency Operation to 350kHz
I
Local 1% Voltage Reference
I
Input Overvoltage Protection
I
Low Start-Up Current
I
Programmable Start Inhibit for Power Supply
Sequencing and Protection
I
Optocoupler Support
I
Soft-Start Control
APPLICATIU
I
Isolated Telecommunication Systems
I
Personal Computers and Peripherals
I
Distributed Power Step-Down Converters
I
Lead Acid Battery Backup Systems
I
Automotive and Heavy Equipment
“Bootstrap” Start Dual
Transistor Synchronous Forward Controller
May 2002
DESCRIPTIOU
The LT
3781 controller simplifies the design of high
power synchronous dual transistor forward DC/DC con-
verters. The part employs fixed frequency current mode
control and supports both isolated and nonisolated to-
pologies. The IC
drives external N-channel power MOSFETs
and operates with input voltages up to 72V.
The LT3781 is ideal for output derived power schemes,
through the use of a large undervoltage lockout hysteresis
range. The part is also equipped with an 18V power supply
pin regulator which prevents exceeding absolute maxi-
mum ratings while in trickle start applications.
The LT3781’s operating frequency is programmable and
can be synchronized up to 350kHz. Switch phase is also
controlled during synchronized operation to accommo-
date multiple-converter systems. Internal logic guaran-
tees 50% maximum duty cycle operation to prevent trans-
former saturation.
The LT3781 is available in a 20-lead SSOP package.
FEATURES
Final Electrical Specifications
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
TYPICAL APPLICATIO
U
Synchronous Forward Converter (Quarter-Brick Footprint)
36V-72V to 5V/7A DC/DC
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3781IG#PBF | 功能描述:IC REG CTRLR ISO PWM CM 20-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LT3781IG#TR | 功能描述:IC REG CTRLR ISO PWM CM 20-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LT3781IG#TRPBF | 功能描述:IC REG CTRLR ISO PWM CM 20-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LT3782 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
| LT3782A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
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