LTC3805-5_15 Datasheet, PDF (16/20 Pages) Linear Technology – Adjustable Frequency Current Mode Flyback/ Boost/SEPIC DC/DC Controller

LTC3805-5
TYPICAL APPLICATIONS
V_IN
5.5V T0 40V
4.56µH
BH510-1009
C_IN
10µF
50V
57.6k
PDZ6.8B
MMBT6428LT1
BAS516
301W
• T1
10µF
50V
D1
PDS760
0.1µF
4.7µF
6.8nF
10k
221k
69.8k
R4 7.15k
80.6k
1
SSFLT
10
GATE
2
LTC3805-5
9
I_TH
V_CC
3
8
FB
OC
4
RUN
5
FS
I_SENSE
7
6
SYNC
GND
11
3.01k
R3
100k
Q1
HAT2266
R_SENSE
0.005Ω
C_OUT
47µF
16V
V_OUT
12V
2A
38055 F08
Figure 8. 5.5V to 40V to 12V/2A SEPIC Converter
Efficiency and Power Loss vs Load Current
100
3.5
90
EFFICIENCY
3.0
80
70
2.5
60
50
40
30
20
10
0
0.01
POWER LOSS
0.1
1
LOAD CURRENT (A)
2.0
1.5
5.5V 1.0
10V
20V
30V
0.5
40V
0
10
38055 TA04b
38055fe
16