LT3757 LINER [Linear Technology], LT3757 Datasheet - Page 31

• Manufacturer Part Number: LT3757
• Description: Boost, Flyback, SEPIC and Inverting Controller
• Manufacturer: LINER [Linear Technology]

Typical applicaTions
I
L1A
5V/DIV
5A/DIV
100
+ I
5.5V TO 36V
V
40
30
20
90
80
70
60
50
OUT
0.001
L1B
V
Efficiency vs Output Current
IN
V
IN
= 12V
V
Start-Up Waveforms
0.01
IN
OUTPUT CURRENT (A)
= 8V
C
C
C
D1: ON SEMI MBRS360T3G
L1A, L1B: COILTRONICS DRQ127-3R3 (*COUPLED INDUCTORS)
M1: VISHAY SILICONIX Si7460DP
IN
OUT1
OUT2
41.2k
300kHz
, C
C
4.7µF
50V
2ms/DIV
IN
2
DC
: KEMET T495X476K020AS
: TAIYO YUDEN TMK432BJ106MM
0.1
: TAIYO YUDEN UMK316BJ475KL
V
IN
= 16V
0.1µF
1
5.5V to 36V Input, 12V/2A Output SEPIC Converter
105k
46.4k
3757 TA05b
3757 TA05d
10
SHDN/UVLO
SYNC
RT
SS
VC
10k
6.8nF
LT3757
V
IN
GND INTV
SENSE
GATE
FBX
CC
4.7µF
10V
X5R
V
L1A
SW
Frequency Foldback Waveforms When Output Short-Circuits
•
1A/DIV
200mV/DIV
M1
0.008
1W
I
OUT
I
I
L1A
L1A
V
10V/DIV
20V/DIV
1.6A
0.4A
(AC)
5A/DIV
OUT
50V, X5R, 2
+ I
V
V
OUT
L1B
SW
4.7µF
C
I
DC
L1B
Load Step Waveforms
•
L1B
D1
500µs/DIV
50µs/DIV
105k
1%
15.8k
1%
+
C
47µF
20V
3757 TA05a
OUT1
2
V
3757 TA05c
IN
= 12V
C
10µF
25V
X5R
3757 TA05e
V
12V
2A
OUT2
OUT
LT3757

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