LTC3803-3 LINER [Linear Technology], LTC3803-3 Datasheet - Page 16

• Manufacturer Part Number: LTC3803-3
• Description: Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT
• Manufacturer: LINER [Linear Technology]

RELATED PARTS
LTC3803-3
TYPICAL APPLICATIO S
PART NUMBER
LT
LT1725
LTC1871
LT1950
LT3420
LT3468/LT3468-1
LTC3803
LTC3803-5
LTC3806
Burst Mode is a registered trademark of Linear Technology Corporation. No R
16
®
1425
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
1n
8.06k
T1: PULSE ENGINEERING PA1006
Q1: FAIRCHILD FDC2512
Q2: VISHAY Si9803
D1: PHILIPS BAS516
25.5k*
R
FB
33k
V
OUT
1
2
3
90% Efficient Synchronous Flyback Converter
DESCRIPTION
Isolated Flyback Switching Regulator
with No External Power Devices
General Purpose Isolated Flyback Controller
Wide Input Range, No R
Flyback, Boost and SEPIC Controller
Current Mode PWM Controller
Photoflash Capacitor Charger with Automatic Refresh
Photoflash Capacitor Charger in 5-Pin SOT-23
Constant Frequency Flyback Controller
Constant Frequency Flyback Controller
Synchronous Flyback Controller
V
GND
I
TH
FB
●
/RUN
LTC3803-3
= 0.8V
FAX: [phone]
36V TO 72V
SENSE
GATE
V
V
IN
CC
220k
10μF
10V
6
5
4
C
C
R
*FOR 5V OUTPUT CHANGE R
U
IN
O
CS
: TDK 100μF, 6.3V, X5R
: TDK 1μF, 100V, X5R
560Ω
: VISHAY OR IRC, 80mΩ
4.7k
SENSE
●
R
CS
www.linear.com
TM
C
Q1
IN
Current Mode
•
T1
•
•
Q2
FB
D1
TO 42.2k
C
0.1μF
O
V
3.3V
1.5A
SENSE
OUT
*
38033 TA04a
is a trademark of Linear Technology Corporation.
COMMENTS
No Optoisolator or “Third Winding” Required, Up to 6W Output
No Optoisolator Required, V
Power Components
Adjustable Switching Frequency, Programmable Undervoltage
Lockout, Optional Burst Mode
Controller for Forward Converters from 30W to 300W
Specialized Flyback Charges High Voltage Photoflash Capacitors
Quickly and Efficiently
Minimal Component Count, Uses Small Transformers;
V
200kHz Switching Frequency, Low Profile (1mm) ThinSOT Package
200kHz Switching Frequency, 4.8V Turn-On Voltage
High Efficiency (89%); Multiple Output with
Excellent Cross Regulation
IN
from 2.5V to 16V
100
100
95
90
85
80
75
70
95
90
85
80
75
70
500
500
V
V
OUT
OUT
750
750
= 3.3V
= 5V*
Efficiency vs Load
Efficiency vs Load
IN
LOAD CURRENT (mA)
LOAD CURRENT (mA)
1000
1000
®
and V
Operation at Light Load
© LINEAR TECHNOLOGY CORPORATION 2006
1250
1250
OUT
Limited Only by External
1500
1500
LT 0407 • PRINTED IN THE USA
V
V
V
V
V
V
V
V
1750 2000
1750 2000
IN
IN
IN
IN
IN
IN
IN
IN
38083 TA04b
38083 TA04c
= 36V
= 48V
= 60V
= 72V
= 36V
= 48V
= 60V
= 72V
38033fa