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| 型号： | LT3825EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/32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： | 11 V ~ 18 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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LT3825
FEATURES
Isolated No-Opto
Synchronous Flyback Controller
with Wide Input Supply Range
DESCRIPTION
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Senses Output Voltage Directly from Primary Side
Winding—No Opto-Isolator Required
Synchronous Driver for High Efficiency
Input Voltage Limited Only by External
Power Components
Accurate Output Regulation without User Trims
Switching Frequency from 50kHz to 250kHz
Synchronizable
Load Compensation
Programmable Undervoltage Lockout
Available in a Thermally Enhanced 16-Lead
TSSOP Package
The LT ? 3825 is an isolated switching regulator controller
designed for medium power flyback topologies. A typical
application is 10W to 60W with input voltage limited only
by external power path components. A third transformer
winding provides output voltage feedback.
The LT3825 is a current mode controller that regulates
output voltage based on sensing secondary voltage via a
transformer winding during flyback. This allows for tight
output regulation without the use of an opto-isolator,
improving dynamic response and reliability. Synchronous
rectification increases converter efficiency and improves
output cross regulation in multiple output converters.
Isolated Medium Power (10W to 60W) Supplies
Isolated Telecom, Medical Converters
Instrumentation Power Supplies
Isolated Power over Ethernet Supplies
APPLICATIONS
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The LT3825 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 circuity.
L , LT, LTC, LTM, Burst Mode, SwitcherCAD, Linear Technology and the Linear logo are registered
trademarks and No R SENSE , ThinSOT are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
6948466, 5841643.
TYPICAL APPLICATION
92
Efficiency
90
88
36V IN
48V IN
48V to 3.3V at 12A Isolated Supply
86
84
72V IN
20
47k
+
SG
SENSE –
15k
?
V IN+
36V TO 72V
2.2μF
402k
28.7k
T1
?
3.01k
47μF
UVLO
LT3825
t ON SYNC R CMP ENDLY OSC GND SFST C CMP
47pF 0.1μF
FB V CC SG PG SENSE +
PGDLY V C
12k 100k 2.1k 150k 0.22μF
100pF
20
0.02
10nF
100k
T1
?
47
× 2
SG
330
0.1μF 2.2nF
? ?
10k
470μF
× 4
15
V OUT+
3.3V
12A
1μF
3825 TA01a
82
80
78
3.43
3.38
3.33
3.28
3.23
2
3
4
5 6 7 8 9
LOAD CURRENT (A)
Regulation
36V IN
48V IN
72V IN
10 11 12
3825 TA01b
3.18
3.13
2
3
4
5
6
7
8
9
10 11 12
LOAD CURRENT (A)
3825 TA01c
3825fe
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
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| LT383 | 制造商:EDSYN 功能描述: |
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| LT3837EFE | 制造商:Linear Technology 功能描述:Current Mode PWM Controller 16-Pin TSSOP EP |
| LT3837EFE#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:- 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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