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| LM3478MA_15 Datasheet, PDF (24/26 Pages) Texas Instruments – High-Efficiency Low-Side N-Channel Controller for Switching Regulator | |||
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LM3478MA
SNVS705B â FEBRUARY 2011 â REVISED FEBRUARY 2013
OTHER APPLICATION CIRCUITS
www.ti.com
Figure 36. Typical Flyback Circuit
CSEN
10 nF
CC2
0.47 PF
RC CC
100: 1 PF
RFB1
10 k:
RSL
604:
RBYP
10:
ISEN
VIN
COMP
FA/SD
LM3478
FB
DR
RFA
71.5 k:
AGND
PGND
CBYP
100 nF
D2
BAT54C-7-F
L1
3.3 PH
+ CIN
2 x 10 PF,
16V
MBRS130LT3
VIN = from 5V to 0.5V
VOUT = 9V, 20 mA
D1
Q1
FDS6690A
RSEN
0.03:
CHF
10 nF
RFB2
61.9 k:
COUT
3 x 10 PF,
16V
Figure 37. Back Powering Circuit for Vin < 3V
(>3V input needed for startup)
24
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