lt3573 Linear Technology Corporation, lt3573 Datasheet - Page 24

• Manufacturer Part Number: lt3573
• Description: Isolated Flyback Converter Without An Opto-coupler
• Manufacturer: Linear Technology Corporation

RELATED PARTS
LT3573
TYPICAL APPLICATION
PART NUMBER
LT1424-5
LT1424-9
LT1425
LTC
LT1725
LT1737
LTC1871/LTC1871-1,
LTC1871-7
LTC1872, LTC1872B SOT-23 Constant-Frequency Current Mode Boost
LT1950
LTC3803/LTC3803-5 200kHz Flyback DC/DC Controller
LTC3805/LTC3805-5 Adjustable Frequency Flyback Controller
LTC3806
LT3825
LT3837
LTC3872
LTC3873/LTC3873-5 No R
Burst Mode is a registered trademark of Linear Technology Corporation. No R
24
®
1624
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
9V TO 30V
V
DESCRIPTION
Isolated Flyback Switching Regulator
Isolated Flyback Switching Regulator
Isolated Flyback Switching Regulator with No
External Power Devices
Current Mode DC/DC Controller
General Purpose Isolated Flyback Controller
High Power Isolated Flyback Controller
Wide Input Range, No R
Flyback, Boost and SEPIC Controller
DC/DC Controller
Current Mode PWM Controller
Synchronous Flyback Controller
Isolated No-Opto Synchronous Flyback Controller V
Isolated No-Opto Synchronous Flyback Controller V
No R
SEPIC Controller
IN
●
SENSE
SENSE
FAX: [phone]
R5
28.7k
C1
10
Boost Controller
Constant-Frequency Boost/Flyback/
μ
F
R6
10k
R1
357k
R2
51.1k
SENSE
C2
10nF
9V to 30V
●
www.linear.com
TM
SHDN/UVLO
TC
R
SS
ILIM
VC
Current Mode
R7
23.7k
C3
2700pF
IN
, +5V/–5V
LT3573
GND
V
IN
TEST
OUT
R
BIAS
COMMENTS
5V Output Voltage, No Optoisolator Required
9V Output, Regulation Maintained Under Light Loads
No Optoisolator or “Third Winding” Required, Up to 6W Output
300kHz Operating Frequency; Buck, Boost, SEPIC Topologies;
V
No Optoisolator Required, V
Components
No Optoisolator or “Third Winding” Required, Up to 50W Output
Adjustable Switching Frequency, 2.5V ≤ V
Operation at Light Load
550kHz Switching Frequency, 2.5V to 9.8V V
Controller for Forward, Boost, Flyback and SEPIC Converters from 30W to 300W
V
V
High Effi ciency (89%); Multiple Output with Excellent Cross Regulation
550kHz Fixed Frequency, 2.75V ≤ V
V
DFN Package
R
REF
SW
IN
IN
IN
IN
IN
IN
FB
Isolated Flyback Converter
SENSE
16V to 75V Limited by External Components, Up to 80W, Current Mode Control
4.5V to 36V Limited by External Components, Up to 60W, Current Mode Control
Up to 36V, SO-8 Package
and V
and V
and V
C4
4.7μF
and ThinSOT are trademarks of Linear Technology Corporation.
OUT
OUT
OUT
80.6k
R4
6.04k
R3
C6
0.22
Limited Only by External Components
Limited Only by External Components
Limited by External Components, 200kHz Frequency, ThinSOT or
μ
F
D3
L1D
7
R8
2k
μ
H
D4
63
3573 TA11
L1A
μ
IN
H
3:1:1:1
and V
*OPTIONAL THIRD
T1
T1: W
WINDING FOR
>24V OPERATION
IN
L1B
7μ
L1C
7μ
OUT
Ü
H
H
≤ 9.8V, ThinSOT
RTH ELEKTRONIK 750310564
D1
D2
Limited Only by External Power
IN
≤ 36V, Optional Burst Mode
LINEAR TECHNOLOGY CORPORATION 2008
IN
Range
C5
47
C6
47
μ
μ
V
+5V, 350mA
COM
V
– 5V, 350mA
F
F
OUT
OUT
TM
or DFN Package
+
–
LT 1008 • PRINTED IN USA
®
3573f