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參數(shù)資料
| 型號(hào)： | LTC3803MPS6-3#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 1 MM HEIGHT, LEAD FREE, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件頁(yè)數(shù)： | 1/16頁(yè) |
| 文件大小： | 170K |
| 代理商： | LTC3803MPS6-3#PBF |
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LTC3803-3
1
38033fd
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.
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Constant Frequency
Current Mode Flyback
DC/DC Controller in ThinSOT
The LTC
3803-3 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 LTC3803-3 provides ±1.5% output voltage accuracy
and consumes only 240μA of quiescent current. Ground-
referenced current sensing allows LTC3803-3-based con-
verters to accept input supplies beyond the LTC3803-3’s
absolute maximum VCC. A micropower hysteretic start-up
feature allows efcient operation at high input voltages. For
simplicity, the LTC3803-3 can also be powered from a high
VIN through a resistor, due to its internal shunt regulator. An
internal undervoltage lockout shuts down the LTC3803-3
when the input voltage is too low to provide sufcient gate
drive to the external MOSFET.
The LTC3803-3 is available in a low prole (1mm) 6-lead
SOT-23 (ThinSOT) package.
5V Output Nonisolated Telecom Housekeeping Power Supply
n VIN and VOUT Limited Only by External Components
n Adjustable Slope Compensation
n Internal Soft-Start
n –55°C to 150°C Operating Temperature Range
n Constant Frequency 300kHz 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 Powered Devices
VCC
ITH/RUN
LTC3803-3
GND
NGATE
SENSE
VFB
UPS840
300μF*
6.3V
X5R
1μF
100V
X5R
150pF
200V
1μF
10V
X5R
VOUT
5V
2A MAX
38033 TA01
68mΩ
220Ω
20k
10k
82k
470pF
105k
4.7k
FDC2512
T1: COOPER CTX02-15242
*THREE 100μF UNITS IN PARALLEL
T1
VIN
36V TO 72V
LOAD CURRENT (mA)
250
50
EFFICIENCY
(%)
55
65
70
75
100
85
750
1250 1500
38033 TA02
60
90
95
80
500
1000
1750 2000
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 72V
VOUT = 5V
Efciency vs Load Current
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