lt3958 Linear Technology Corporation, lt3958 Datasheet - Page 26

• Manufacturer Part Number: lt3958
• Description: High Input Voltage, Boost, Flyback, Sepic And Inverting Converter
• Manufacturer: Linear Technology Corporation

LT3958
TYPICAL APPLICATIONS
26
I
L1A
5V/DIV
2A/DIV
+ I
V
OUT
L1B
90
85
80
75
70
65
60
55
50
0
V
IN
Effi ciency vs Output Current
= 24V
200
Start-Up Waveforms
OUTPUT CURRENT (mA)
400
10V TO 60V
5ms/DIV
600
V
IN
800
V
IN
10V to 60V Input, –12V Output Inverting Converter
C
2.2μF
100V
X5R
IN
= 24V
3958 TA05d
3958 TA05b
1000
C
C
D1: VISHAY SILICONIX 10MQ100N
L1A, L1B: COILTRONICS DRQ125-220
IN
OUT
392k
66.5k
300kHz
, C
41.2k
: MURATA GRM32ER61C226KE20
DC
: MURATA GRM32ER72A225KA35L
EN/UVLO
SGND
SYNC
RT SS
V
IN
0.47μF
LT3958
L1A
VC
SW
10k
10nF
SENSE1
SENSE2
INTV
C
2.2μF, 100V
X7R, 2
0.5A/DIV
DC
GND
FBX
I
CC
L1A
I
OUT
10V/DIV
20V/DIV
C
4.7μF
10V
X5R
1V/DIV
2A/DIV
VCC
+ I
V
V
(AC)
0.8A
0.2A
V
OUT
OUT
L1B
SW
D1
L1B
V
V
Frequency Foldback Waveforms
IN
IN
3958 TA05a
= 24V
= 24V
When Output Short-Circuit
Load Step Waveforms
105k
7.5k
C
22μF
16V
X5R
500μs/DIV
OUT
2
50μs/DIV
V
–12V
1A
OUT
3958 TA05c
3958 TA05e
3958f