LTC3803-5_15 Datasheet, PDF (16/16 Pages) Linear Technology – Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT

LTC3803-5
TYPICAL APPLICATION
Synchronous Flyback Converter
V_IN
36V TO 72V
220k _MMBTA42
PDZ6.8B
130Ω
1n
33k ₁
6
I_TH/RUN GATE
2
LTC3803-5
GND
V_CC
5
8.06k
3
V_FB
25.5k*
R_FB
V_OUT
4
SENSE
C_IN ^T1
• ^Q2
•
D1
Q1
•
560
5k
1μF
10V
R_CS
V_OUT*
3.3V
1.5A
C_O
0.1μF
38035 TA04
T1: PULSE ENGINEERING PA1006
Q1: FAIRCHILD FDC2512
Q2: VISHAY Si9803
D1: PHILIPS BAS516
R_CS: VISHAY OR IRC, 80mΩ
C_IN: TDK 1μF, 100V, X5R *FOR 5V OUTPUT CHANGE
C_O: TDK 100μF, 6.3V, X5R R_FB TO 42.2k
RELATED PARTS
PART NUMBER
LT3573
LTC3805/
LTC3805-5
LTC3873/
LTC3873-5
LT3757
DESCRIPTION
Isolated Flyback Switching Regulator with 60V
Integrated Switch
Adjustable Constant Frequency Flyback, Boost, SEPIC
DC/DC Controller
No R_SENSE™ Constant Frequency Flyback, Boost, SEPIC
Controller
Boost, Flyback, SEPIC and Inverting Controller
LT3758
Boost, Flyback, SEPIC and Inverting Controller
LTC1871/LTC1871-1/ Wide Input Range, No R_SENSE Low Quiescent Current
LTC1871-7
Flyback, Boost and SEPIC Controller
COMMENTS
3V ≤ V_IN ≤ 40V, No Opto-Isolator or Third Winding Required, Up to 7W
Output Power, MSOP-16E
V_IN and V_OUT Limited Only by External Components, 3mm × 3mm DFN-10,
MSOP-10E Packages
V_IN and V_OUT Limited Only by External Components, 8-pin ThinSOT or
2mm × 3mm DFN-8 Packages
2.9V ≤ V_IN ≤ 40V, 100kHz to 1MHz Programmable Operating Frequency,
3mm × 3mm DFN-10 and MSOP-10E Package
5.5V ≤ V_IN ≤ 100V, 100kHz to 1MHz Programmable Operating Frequency,
3mm × 3mm DFN-10 and MSOP-10E
Programmable Operating Frequency, 2.5V ≤ V_IN ≤ 36V, Burst Mode^®
Operation at Light Load, MSOP-10
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
38035fd
LT 0610 REV D • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2004