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参数资料
| 型号： | LT3837EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO 16-TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 88% |
| 电源电压： | 4.5 V ~ 20 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
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LT3837
Isolated No-Opto
Synchronous Flyback Controller
Senses Output Voltage Directly from Primary Side
Synchronous Driver for High Efficiency
Supply Voltage Range 4.5V to 20V
Accurate Regulation Without User Trims
Programmable Switching Frequency from
Synchronizable
Load Compensation
Undervoltage Lockout
Available in a Thermally Enhanced 16-Lead
Isolated Medium Power (10W to 60W) Supplies
Instrumentation Power Supplies
Isolated Medical Supplies
FEATURES
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Winding—No Optoisolator Required
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n
n
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50kHz to 250kHz
n
n
n
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TSSOP Package
APPLICATIONS
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L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6498466, 5841643.
DESCRIPTION
The LT ? 3837 is an isolated switching regulator controller
designed for medium power flyback topologies. A typical
application is 10W to 60W with the part powered from a
DC supply.
The LT3837 is a current mode controller that regulates an
output voltage based on sensing the secondary voltage
via a transformer winding during flyback. This allows for
tight output regulation without the use of an optoisolator,
improving dynamic response and reliability. Synchronous
rectification increases converter efficiency and improves
output cross regulation in multiple output converters.
The LT3837 operates in forced continuous conduction
mode which improves cross regulation in multiple winding
applications. Switching frequency is user programmable
and can be externally synchronized. The part also has load
compensation, undervoltage lockout and soft-start circuitry.
The LT3837 is available in a thermally enhanced 16-pin
TSSOP package.
TYPICAL APPLICATION
90
Efficiency vs Load Current
22.1k
9V –18V to 3.3V at 10A Isolated Converter
V IN
10μF
88
86
84
9V IN
18V IN
2N3906
BAS16
22μF
V CC
86.6k
2.2nF
100nH OUTPUT 3.3V/10A
47μF × 3 220μF
82
80
78
SENSE +
SENSE –
3k
20k
3.3nF
1nF
150k
1.37k
47pF
100k
12k
0.1μF
FB UVLO
V C
LT3837
OSC
SFST
t ON
ENDLY
PGDLY
R CMP
C CMP
GND
PG
SG
15k
330
10
Si7852DP
8m
0.1μF
?
Si7336ADP
2.2nF
?
B0540W
10k
10
FMMT618
FMMT718
15
BAT54
1μF
76
3.60
3.50
3.40
3.30
3.20
2 3 4 5 6 7 8 9 10
LOAD CURRENT (A) 3837 TA01b
Regulation vs Load Current
9V IN
18V IN
3837 TA01a
3.10
3.00
2
3
4
5
6
7
8
9
10
LOAD CURRENT (A)
3837 TA01c
3837fd
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3837IFE#PBF | 功能描述:IC REG CTRLR FLYBK ISO 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT3837IFE#TRPBF | 功能描述:IC REG CTRLR FLYBK ISO 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT383L313 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| LT3844 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency |
| LT3844EFE | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency |
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