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LTC3765

更新时间： 2023-12-20 18:44:55
品牌 Logo 应用领域
亚德诺 - ADI 栅极驱动控制器驱动器
页数 文件大小 规格书
24页 266K
描述
有源箝位正激式控制器和栅极驱动器

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中文翻译

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LTC3765 数据手册

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LTC3765  
Active Clamp Forward  
Controller and Gate Driver  
FEATURES  
DESCRIPTION  
The LTC®3765 is a start-up controller and gate driver for  
use in a self-starting secondary-side control forward con-  
verter. When combined with the LTC3766 secondary-side  
synchronousforwardcontroller,acompleteisolatedpower  
supply is created using a minimum of discrete parts. A  
proprietary scheme is used to multiplex gate drive signals  
and bias power across the isolation barrier through a  
small pulse transformer. The LTC3765 contains an on-  
chip bridge rectifier that extracts gate drive bias power  
from this pulse transformer, eliminating the need for a  
separate bias supply. A precision undervoltage lockout  
circuit and linear regulator controller ensure a quick and  
well-controlled start-up.  
n
Supports Self-Starting Secondary-Side Control  
n
Direct Flux Limit™ Guarantees No Saturation  
n
Active Clamp Drive with Delay Adjustment  
n
On-Chip Bridge Rectifier Eliminates Need for  
Separate Gate Drive Bias Supply  
n
Wide Input Supply Range: 8V and Up (Limited Only  
by External Components)  
n
Linear Regulator Controller for Fast Start-Up  
n
High Speed Gate Drivers  
n
Precision UVLO with Adjustable Hysteresis  
n
Overcurrent Protection  
Overtemperature Protection  
n
n
Adjustable Start-Up Frequency and Soft-Start  
Tiny 16-Lead MSOP Package  
n
TheLTC3765includesanactiveclampoutputfordrivingan  
external PMOS, as well as an adjustable delay to optimize  
efficiency. The active clamp architecture reduces voltage  
stress on the main power switch, and provides the highest  
possible efficiency. Overcurrent protection and the Direct  
Flux Limit guarantee no transformer saturation without  
compromising transient response.  
APPLICATIONS  
n
Isolated Battery Chargers  
n
Isolated 48V Telecommunication Systems  
n
Servers and Embedded Computing  
Automotive and Heavy Equipment  
n
L, LT, LTC, LTM, PolyPhase, Linear Technology and the Linear logo are registered trademarks  
and Direct Flux Limit is a trademark of Linear Technology Corporation. All other trademarks  
are the property of their respective owners. Protected by U.S. Patents, including 7200014 and  
6144194. Other patents pending.  
TYPICAL APPLICATION  
36V-72V to 5V/15A Active Clamp Isolated Forward Converter  
+
T1  
6:2  
V
+
OUT  
V
IN  
36V TO 72V  
5V  
L1  
1.4µH  
•
•
15A  
2.2µF  
100V  
×3  
220µF  
6.3V  
×2  
L1: PULSE PA1393.152  
T1: PULSE PA0810  
T2: PULSE PA0297  
FDMS86201  
BSC0901NS  
33nF  
200V  
100nF  
200V  
SiR414DP  
15mΩ  
0.5W  
3mΩ  
2W  
168Ω  
–
–
V
IN  
V
OUT  
2.2nF  
250VAC  
Si3437DV  
(SOT-23)  
100k  
100Ω 100Ω  
1nF  
Si3440DV  
+
–
1Ω  
FG SW SG RUN  
–
V
IN  
NDRV V  
FS/SYNC V  
V
CC  
S S  
4.42k  
I
I
S
S
365k  
1/8W  
+
–
+
0.1µF  
1.0µF  
NDRV PG  
RUN  
I
I
S
AG  
I
SMAG  
T2  
2:1  
FB  
S
LTC3766  
+
–
+
–
IN  
IN  
PT  
PT  
ITH  
604Ω  
470pF  
•
•
LTC3765  
V
CC  
SS  
SSFLT  
R
FS/UV  
SGND PGND  
GND PGND  
I
SGD  
26.1k 15k  
FGD MODE  
22k  
4.7µF  
15k  
PK  
DELAY  
14k  
CORE  
33nF  
17.8k  
47pF  
33nF  
10.5k  
18.2k  
3765 TA01  
3765fb  
1
For more information www.linear.com/LTC3765  
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