参数资料
型号: LTC3803MPS6#TRMPBF
厂商: Linear Technology
文件页数: 1/16页
文件大小: 0K
描述: IC REG CTRLR FLYBK PWM TSOT23-6
标准包装: 1
PWM 型: 电流模式
输出数: 1
频率 - 最大: 240kHz
占空比: 90%
电源电压: 5.7 V ~ 8 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -55°C ~ 150°C
封装/外壳: SOT-23-6 细型,TSOT-23-6
包装: 标准包装
相关产品: 732-2263-6-ND - TRANS FLYBACK LTC3803 16.9UH
732-2263-1-ND - TRANS FLYBACK LTC3803 16.9UH
732-2263-2-ND - TRANS FLYBACK LTC3803 16.9UH
其它名称: LTC3803MPS6#TRMPBFDKR

LTC3803
Constant Frequency
Current Mode Flyback
DC/DC Controller in ThinSOT
FEATURES
DESCRIPTION
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n
n
n
n
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V IN and V OUT 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
Low Quiescent Current: 240μA
Low Pro?le (1mm) SOT-23 Package
The LTC ? 3803 is a constant frequency current mode ?yback
controller optimized for driving N-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.
The LTC3803 provides ±1.5% output voltage accuracy and
consumes only 240μA of quiescent current. Ground-refer-
enced current sensing allows LTC3803-based converters
APPLICATIONS
to accept input supplies beyond the LTC3803’s absolute
maximum V CC . A micropower hysteretic start-up feature
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Telecom Power Supplies
42V and 12V Automotive Power Supplies
Auxiliary/Housekeeping Power Supplies
Power Over Ethernet
allows ef?cient operation at high input voltages. For sim-
plicity, the LTC3803 can also be powered from a high V IN
through a resistor, due to its internal shunt regulator. An
internal undervoltage lockout shuts down the LTC3803
when the input voltage is too low to provide suf?cient
L , LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT and No R SENSE are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
gate drive to the external MOSFET.
The LTC3803 is available in a low pro?le (1mm) 6-lead
SOT-23 (ThinSOT?) package.
TYPICAL APPLICATION
5V Output Nonisolated Telecom Housekeeping Power Supply
V IN
90
Ef?ciency vs Load Current
10μF
10V
X5R
36V TO 72V
10k
V CC
4.7μF
100V
X5R
?
T1
?
UPS840
300μF*
6.3V
X5R
V OUT
5V
2A MAX
80
70
60
50
40
V IN = 36V
V IN = 48V
V IN = 60V
V IN = 72V
56k
I TH /RUN NGATE
LTC3803
FDC2512
30
0.0022μF
GND
V FB
SENSE
68mΩ
20
10
20k
105k
T1: COOPER CTX02-15242
3803 TA01
0
0.1
1
I OUT (A)
10
*THREE 100μF UNITS IN PARALLEL
3803 TA02
3803fc
1
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