Datasheet

LM3478
V
IN
I
SEN
COMP
FB
AGND
DR
PGND
FA/SD
+
V
IN
= from 5V to 0.5V
V
OUT
= 9V, 20 mA
C
OUT
3 x 10 PF,
16V
R
SEN
0.03:
L1
3.3 PH
MBRS130LT3
Q1
FDS6690A
R
C
100:
C
C
1 PF
D1
C
C2
0.47 PF
R
FA
71.5 k:
R
FB2
61.9 k:
R
FB1
10 k:
C
BYP
100 nF
D2
BAT54C-7-F
R
BYP
10:
C
SEN
10 nF
R
SL
604:
C
HF
10 nF
C
IN
2 x 10 PF,
16V
LM3478
LM3478-Q1
SNVS085V –JULY 2000–REVISED FEBRUARY 2013 www.ti.com
Other Application Circuits
Figure 37. Typical Flyback Circuit
Figure 38. Back Powering Circuit for Vin < 3V
(>3V input needed for startup)
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