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參數(shù)資料
| 型號： | LTC3803MPS6-5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件頁數(shù)： | 1/16頁 |
| 文件大小： | 162K |
| 代理商： | LTC3803MPS6-5 |
LTC3803-5
1
38035fd
TYPICAL APPLICATION
DESCRIPTION
Constant Frequency
Current Mode Flyback
DC/DC Controller in ThinSOT
The LTC3803-5 is a constant frequency current mode
yback controller optimized for driving N-channel MOSFETs
in high input voltage applications. The LTC3803-5 operates
from inputs as low as 5V. 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 LTC3803-5 provides ±1.5% output voltage accuracy
and consumes only 240μA of quiescent current. Ground-
referenced current sensing allows LTC3803-5-based con-
verters to accept input supplies beyond the LTC3803-5’s
absolute maximum VCC. For simplicity, the LTC3803-5 can
be powered from a high VIN through a resistor, due to its
internal shunt regulator. An internal undervoltage lockout
shuts down the IC when the input voltage is too low to
provide sufcient gate drive to the external MOSFET.
The LTC3803-5 is available in a low prole (1mm) 6-lead
SOT-23 (ThinSOT) package.
Dual Output Wide Input Range Converter
FEATURES
APPLICATIONS
n VIN and VOUT Limited Only by External Components
n 4.8V Undervoltage Lockout Threshold
n Operating Junction Temperature from –55°C to
150°C
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 42V and 12V Automotive Power Supplies
n Telecom Power Supplies
n Auxiliary/Housekeeping Power Supplies
n Power Over Ethernet
Efciency and Power Loss
vs Output Power
ITH/RUN
GND
VFB
LTC3803-5
NGATE
VCC
SENSE
10MQ100N
B3100
1μF
100V
×3
13V/0.3A
20mA MIN
LOAD
6.5V/1.2A
38035 TA01
0.012Ω
0.1μF
22k
7.5k
57.6k
8.06k
4.7k
10nF
1μF
100V
1μF
100V
PHM25NQ10T
ALL CAPACITORS ARE X7R, TDK
VIN
6V TO 50V
MMBTA42
22μF
10V
47μF
10V
PDZ6.8B
VPH5-0155
OUTPUT POWER (W)
02
EFFICIENCY
(%)
POWER
LOSS
(W)
90
85
80
75
70
65
60
3.0
2.5
2.0
1.5
1.0
0.5
0
4
68
10
38035 TA01b
12
VIN = 8V
VIN = 12V
VIN = 24V
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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