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| 型号： | LT3781IG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM CM 20-SSOP |
| 标准包装： | 1,800 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 700kHz |
| 占空比： | 100% |
| 电源电压： | 8 V ~ 72 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 包装： | 带卷 (TR) |
LT3781
“Bootstrap” Start Dual
Transistor Synchronous Forward Controller
FEATURES
DESCRIPTIO
s
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
Synchronous Switch Output
Undervoltage Lockout Protection with 6V Hysteresis
for Self-Biased Power
Fixed Frequency Operation to 350kHz
Local ± 1% Voltage Reference
Input Overvoltage Protection
Low Start-Up Current
Programmable Start Inhibit for Power Supply
Sequencing and Protection
Optocoupler Support
Soft-Start Control
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 V CC shunt
regulator, which prevents exceeding absolute maximum
ratings while in trickle start applications.
The LT3781’s operating frequency is programmable and
can be synchronized up to 350kHz. Switch phase is also
APPLICATIO S
controlled during synchronized operation to accommo-
date multiple-converter systems. Internal logic guaran-
s
s
s
s
s
Isolated Telecommunication Systems
Personal Computers and Peripherals
Distributed Power Step-Down Converters
Lead Acid Battery Backup Systems
Automotive and Heavy Equipment
tees 50% maximum duty cycle operation to prevent trans-
former saturation.
The LT3781 is available in a 20-lead SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
36V-72V to 5V/7A DC/DC
0.25W
3
MURS120T3
10
0.25W
0.025 ?
V IN+
+
L1
4.7 μ H
C2
22 μ F
100V
C3
1.5 μ F
100V
C4
1.5 μ F
100V
Synchronous Forward Converter (Quarter-Brick Footprint)
T1
6
Q1 1
7 2 10 ?
MURS120T3
5
1nF
8 100V
1nF
11 100V 10 ?
R9 4
Q3 12
1/2W 9
Q5
Q6
L2
4.7 μ H
MBR-
0540T1
4.7 ?
+
V OUT = 5V
I OUT = 7A
V OUT+
C5
330 μ F
10V
V IN–
ZVN3310F
BAT54
V OUT–
+
10k
2
1
1.24k
100 ?
1%
0.01 μ F
100 ?
0.1 μ F
68 μ F
20V
270k
0.25W
1nF
73.2k
1%
20k
10k
1OV
BIAS
13
BAS21
V CC V BST TG BSTREF BG SENSE PGND 12
1 μ F 150pF 4.7nF
0.1 μ F
52.3k
MMBD914LT1 100V 330pF
20 19 18 15 11 14
SG
OVLO LT3781
9
SHDN 5V REF FSET THERM SYNC SGND SS V C V FB
5 6 3 7 4 8 10
5V
OUT
0.047 μ F
3.01k
1%
1k
1%
3.3k
51 ?
6.8k
8
3
1
4
1OV
BIAS
LTC1693-2
V CC1 V CC2
IN2 OUT2
IN1 OUT1
GND2 GND1
6
5
7
2
2k
FZT690 0.22 μ F
50V
CMPZ5242B
4.7 μ F 12V
16V
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
3781f
1
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| LT3782AEFE#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
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