LT3574_15 Datasheet, PDF (20/24 Pages) Linear Technology – Isolated Flyback Converter Without an Opto-Coupler

LT3574
typical Applications
3.3V Isolated Flyback Converter
V_IN
12V TO 24V
(36V*)
C1
10µF
R1
499k
V_IN
SHDN/UVLO
R2
71.5k
LT3574
R_FB
R_REF
TC
R_ILIM
SW
SS
C6
0.22µF
R3
76.8k
D1
4:1:1
R8
2k
T1
50µH _•
•
3.1µH
D3
V_OUT ⁺
3.3V
0.5A
C5
47µF
V_OUT ^–
R4
6.04k
T1: PULSE PA3018NL
OR WÜRTH ELEKTRONIK
750311304
D1: B340A
D3: PMEG6010
R6
R5
19.1k 10k
VC
GND TEST BIAS
C2
R7
10nF _25.5k
C3
1500pF
C4
4.7µF
D2
L1C
3.1µH
*OPTIONAL THIRD
WINDING FOR
36V OPERATION
3574 TA05
12V Isolated Flyback Converter
V_IN
12V
C1
R1
10µF
499k _{SHDN/UVLO VIN}
R2
71.5k
C6
0.22µF
D1
3:1
R8 _T1
2k _58.5µH
•
•
6.5µH
D2
V_OUT
12V
150mA
C5
22µF
V_OUT–
LT3574
R_FB
R3
178k
R_REF
R4
TC
6.04k
R_ILIM
SS
SW
VC
GND TEST BIAS
R6 R5
R7
59k 10k
40.2k
V_IN
C2
C3
10nF
4700pF
3574 TA06
T1: COILTRONICS VP1-0102-R
D1: B340A
D2: PMEG6010
3574f
20