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LTC3803ES6 Datasheet

  • LTC3803ES6

  • Constant Frequency Current Mode Flyback DC/DC Controller in ...

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Final Electrical Specifications
LTC3803
Constant Frequency
Current Mode Flyback
DC/DC Controller in ThinSOT
August 2003
FEATURES
s
s
s
s
s
s
DESCRIPTION
The LTC
廬
3803 is a constant frequency current mode
flyback controller optimized for driving 6V-rated 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
鹵1.5%
output voltage accuracy
and consumes only 240碌A(chǔ) of quiescent current. Ground-
referenced current sensing allows LTC3803-based con-
verters to accept input supplies beyond the LTC3803鈥檚
absolute maximum V
CC
. A micropower hysteretic start-up
feature allows efficient operation at high input voltages.
For simplicity, the LTC3803 can also be powered from a
high V
IN
through a resistor, due to its internal 9.4V shunt
regulator. An internal undervoltage lockout shuts down
the LTC3803 when the input voltage falls below 4.6V,
guaranteeing at least 4.6V of gate drive to the external
MOSFET.
The LTC3803 is available in a low profile (1mm) 6-lead
SOT-23 (ThinSOT
TM
) package.
s
s
s
V
IN
and V
OUT
Limited Only by External Components
Adjustable Slope Compensation
Internal Soft-Start
Constant Frequency 200kHz Operation
鹵1.5%
Reference Accuracy
Current Mode Operation for Excellent Line and Load
Transient Response
No Minimum Load Requirement
Low Quiescent Current: 240碌A(chǔ)
Low Profile (1mm) SOT-23 Package
APPLICATIO S
s
s
s
s
Telecom Power Supplies
42V and 12V Automotive Power Supplies
Auxiliary/Housekeeping Power Supplies
Power Over Ethernet
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
V
IN
36V TO 72V
5V Output Nonisolated Telecom Housekeeping Power Supply
UPS840
T1
10k
10碌F
10V
X5R
56k
0.0022碌F
4.7碌F
100V
X5R
90
V
OUT
5V
2A MAX
80
70
EFFICIENCY (%)
鈥?/div>
鈥?/div>
FDC2512
300碌F*
6.3V
X5R
60
50
40
30
20
V
IN
= 72V
V
CC
I
TH
/RUN NGATE
LTC3803
GND
V
FB
20k
105k
3803 TA01
SENSE
68m鈩?/div>
10
0
0.1
1
I
OUT
(A)
3803 TA02
T1: COOPER CTX02-15242
*THREE 100碌F UNITS IN PARALLEL
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
U
U
Efficiency vs Load Current
V
IN
= 36V
V
IN
= 48V
V
IN
= 60V
10
3803i
1

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