LT3581 LINER [Linear Technology], LT3581 Datasheet - Page 29

• Manufacturer Part Number: LT3581
• Description: 3.3A Boost/Inverting DC/DC Converter with Fault Protection
• Manufacturer: LINER [Linear Technology]

Typical applicaTions
AC-COUPLED
Transient Response with 60mA to 140mA to 60mA
0.5A/DIV
0.1A/DIV
2V/DIV
I
V
LOAD
OUT
I
L
High Efficiency, VFD (Vacuum Fluorescent Display) Power Supply Switches at 2MHz to Avoid AM Band
Load Step on V
9V TO 16V
2.2µF
V
C1
IN
100µs/DIV
OUT2
C1: 2.2µF , 25V, X7R, 1206
C2 TO C7: 2.2µF , 50V, X7R, 1206
D1 TO D7: CENTRAL SEMI SOD123F
DANGER HIGH VOLTAGE! OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY
(V
43.2k
32.6k
10k
IN
= 12V)
100k
3581 TA04b
10µH
L1
Efficiency and Power Loss at V
V
FAULT
SHDN
RT
SYNC
90
85
80
75
70
IN
0
SW1 SW2
LT3581
D7
GND
CLKOUT
4
TOTAL OUTPUT POWER (W)
D8: CENTRAL SEMI CMDSH-3TR
D9: CENTRAL SEMI CMHZ5240B-LTZ
L1: TAIYO YUDEN NR6045T100M
M1: VISHAY SILICONIX SI7611DN
GATE
0.47µF
V
SS
FB
D2
C
C5
2.2µF
C4
2.2µF
8
D1
2.2µF
C2
365k
100pF
12
D6
D5
D4
D3
16
D9*
10V
24k
0.5A/DIV
50V/DIV
50V/DIV
1nF
1V/DIV
3581 TA04d
V
V
IN
OUT2
OUT1
V
SS
= 12V
I
8.06k
L
20
3.0
2.5
2.0
1.5
1.0
M1*
*OPTIONAL,
FOR OUTPUT SHORT-CIRCUIT
PROTECTION
D8*
2.2µF
2.2µF
2.2µF
Start-Up Waveforms
3581 TA04a
C7
C6
C3
V
IN
100ms/DIV
V
97V
90mA (V
140mA (V
180mA (V
V
65V
60mA (V
70mA (V
90mA (V
OUT2
OUT1
IN
IN
IN
IN
IN
IN
= 9V)
= 9V)
= 12V)
= 16V)
= 12V)
= 16V)
3581 TA04c
LT3581

3581f