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LTC3803HS6-5#TRPBF 数据手册 - ADI（亚德诺）
制造商:
ADI（亚德诺）
封装:
TSOT-23
描述:
升降压型 4V~8.1V 200kHz
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LTC3803HS6-5#TRPBF数据手册
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LTC3803-5
1
38035fd
TYPICAL APPLICATION
DESCRIPTION
Constant Frequency
Current Mode Flyback
DC/DC Controller in ThinSOT
The LTC
®
3803-5 is a constant frequency current mode
fl 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 V
CC
. For simplicity, the LTC3803-5 can
be powered from a high V
IN
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 suffi cient gate drive to the external MOSFET.
The LTC3803-5 is available in a low profi le (1mm) 6-lead
SOT-23 (ThinSOT™) package.
Dual Output Wide Input Range Converter
FEATURES
APPLICATIONS
n
V
IN
and V
OUT
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 Profi le (1mm) SOT-23 Package
n
42V and 12V Automotive Power Supplies
n
Telecom Power Supplies
n
Auxiliary/Housekeeping Power Supplies
n
Power Over Ethernet
Effi ciency and Power Loss
vs Output Power
I
TH
/RUN
GND
V
FB
LTC3803-5
NGATE
V
CC
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
V
IN
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
6810
38035 TA01b
12
V
IN
= 8V
V
IN
= 12V
V
IN
= 12V
V
IN
= 24V
V
IN
= 48V
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.
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