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參數資料
| 型號： | LTC3803MPS6#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 240 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | LEAD FREE, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件頁數： | 1/16頁 |
| 文件大小： | 164K |
| 代理商： | LTC3803MPS6#TRPBF |
LTC3803
1
3803fc
TYPICAL APPLICATION
DESCRIPTION
Constant Frequency
Current Mode Flyback
DC/DC Controller in ThinSOT
The LTC3803 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
to accept input supplies beyond the LTC3803’s absolute
maximum VCC. A micropower hysteretic start-up feature
allows efcient operation at high input voltages. For sim-
plicity, the LTC3803 can also be powered from a high VIN
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 sufcient
gate drive to the external MOSFET.
The LTC3803 is available in a low prole (1mm) 6-lead
SOT-23 (ThinSOT) package.
5V Output Nonisolated Telecom Housekeeping Power Supply
FEATURES
APPLICATIONS
n VIN and VOUT Limited Only by External Components
n Adjustable Slope Compensation
n Internal Soft-Start
n Constant Frequency 200kHz Operation
n ±1.5% Reference Accuracy
n Current Mode Operation for Excellent Line and Load
Transient Response
n No Minimum Load Requirement
n Low Quiescent Current: 240μA
n Low Prole (1mm) SOT-23 Package
n Telecom Power Supplies
n 42V and 12V Automotive Power Supplies
n Auxiliary/Housekeeping Power Supplies
n Power Over Ethernet
Efciency vs Load Current
VCC
ITH/RUN
LTC3803
GND
NGATE
SENSE
VFB
UPS840
300μF*
6.3V
X5R
4.7μF
100V
X5R
10μF
10V
X5R
VOUT
5V
2A MAX
3803 TA01
68mΩ
20k
10k
56k
0.0022μF
105k
FDC2512
T1: COOPER CTX02-15242
*THREE 100μF UNITS IN PARALLEL
T1
VIN
36V TO 72V
IOUT (A)
0.1
EFFICIENCY
(%)
50
60
70
10
3803 TA02
40
30
0
1
20
10
90
80
VIN = 36V
VIN = 72V
VIN = 60V
VIN = 48V
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT and No RSENSE are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
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相關代理商/技術參數 |
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