LTC3803-5_15 Datasheet, PDF (13/16 Pages) Linear Technology – Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT

LTC3803-5
TYPICAL APPLICATIONS
4:1 Input Range 3.3V Output Isolated Flyback DC/DC Converter
V_IN+
18 V TO 72V
V_IN–
2.2μF
220k _MMBTA42
PDZ6.8B
130Ω
V_CC
680Ω
1 _{ITH/RUN GATE} 6
2
LTC3803-5
GND
V_CC
5
3
V_FB
4
SENSE
FDC2512
4.7k
0.1μF _0.040Ω
T1
PA1277NL
•
•
68Ω
150pF
22Ω ^BAS516
•
0.1μF
V_CC
PDS1040
BAS516
100μF
6.3V
×3
10Ω
V_OUT+
BAT760
270Ω
V_OUT+
3.3V
3A
GND
BAS516
6.8k
PS2801-1
1
2
BAS516
1 _VIN
OPTO ⁶
0.1μF
LT4430
2
5
GND COMP
0.33μF _{3 OC}
FB ⁴
2.2nF _56k
22.1k
38035 TA05
V_OUT+
47pF
100k
Efficiency vs Load Current
84
82
80
78
76
74
72
70
0
V_IN = 48V
V_IN = 24V
1
2
3
4
I_OUT (A)
38035 TA05a
38035fd
13