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LTC3803

更新时间： 2024-11-08 22:55:55
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
12页 174K
描述
Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT

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中文翻译

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LTC3803 数据手册

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Final Electrical Specifications  
LTC3803  
Constant Frequency  
Current Mode Flyback  
DC/DC Controller in ThinSOT  
August 2003  
U
DESCRIPTION  
FEATURES  
The LTC®3803 is a constant frequency current mode  
flybackcontrolleroptimizedfordriving6V-ratedN-channel  
MOSFETs in high input voltage applications. Constant  
frequency operation is maintained down to very light  
loads, resulting in less low frequency noise generation  
over a wide range of load currents. Slope compensation  
can be programmed with an external resistor.  
■
VIN and VOUT Limited Only by External Components  
■
Adjustable Slope Compensation  
■
Internal Soft-Start  
■
Constant Frequency 200kHz Operation  
■
±1.5% Reference Accuracy  
■
Current Mode Operation for Excellent Line and Load  
Transient Response  
■
No Minimum Load Requirement  
The LTC3803 provides ±1.5% output voltage accuracy  
and consumes only 240µA of quiescent current. Ground-  
referenced current sensing allows LTC3803-based con-  
verters to accept input supplies beyond the LTC3803’s  
absolute maximum VCC. A micropower hysteretic start-up  
feature allows efficient operation at high input voltages.  
For simplicity, the LTC3803 can also be powered from a  
high VIN through a resistor, due to its internal 9.4V shunt  
regulator. An internal undervoltage lockout shuts down  
the LTC3803 when the input voltage falls below 4.6V,  
guaranteeing at least 4.6V of gate drive to the external  
MOSFET.  
■
Low Quiescent Current: 240µA  
■
Low Profile (1mm) SOT-23 Package  
U
APPLICATIO S  
■
Telecom Power Supplies  
■
42V and 12V Automotive Power Supplies  
■
Auxiliary/Housekeeping Power Supplies  
Power Over Ethernet  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
ThinSOT is a trademark of Linear Technology Corporation.  
The LTC3803 is available in a low profile (1mm) 6-lead  
SOT-23 (ThinSOTTM) package.  
U
TYPICAL APPLICATIO  
5V Output Nonisolated Telecom Housekeeping Power Supply  
Efficiency vs Load Current  
V
IN  
90  
36V TO 72V  
UPS840  
V
V
IN  
= 36V  
OUT  
5V  
80  
70  
60  
50  
40  
30  
20  
10  
0
T1  
•
2A MAX  
4.7µF  
100V  
X5R  
300µF*  
6.3V  
X5R  
10k  
V
IN  
= 48V  
10µF  
10V  
X5R  
•
V
= 60V  
IN  
V
IN  
= 72V  
V
CC  
I
/RUN NGATE  
LTC3803  
FDC2512  
TH  
56k  
0.0022µF  
GND  
SENSE  
V
FB  
68mΩ  
20k  
105k  
1
0.1  
10  
3803 TA01  
I
(A)  
OUT  
T1: COOPER CTX02-15242  
*THREE 100µF UNITS IN PARALLEL  
3803 TA02  
3803i  
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-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
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