Datasheet

LT3581
29
3581fa
For more information www.linear.com/LT3581
High Efficiency, VFD (Vacuum Fluorescent Display) Power Supply Switches at 2MHz to Avoid AM Band
Typical applicaTions
V
IN
9V TO 16V
V
IN
V
OUT2
97V
90mA (V
IN
= 9V)
140mA (V
IN
= 12V)
180mA (V
IN
= 16V)
V
OUT1
65V
60mA (V
IN
= 9V)
70mA (V
IN
= 12V)
90mA (V
IN
= 16V)
24k
C2
2.2µF
L1
10µH
C5
2.2µF
C4
2.2µF
0.47µF
43.2k
100pF
1nF
100k
C1
2.2µF
365k
D3
D2
D1
D7
D9*
10V
D4
D5
D6
10k
32.6k
SW1 SW2
FB
V
C
SS
GND
SYNC
GATE
CLKOUT
V
IN
RT
FAULT
SHDN
LT3581
3581 TA04a
8.06k
C6
2.2µF
C7
2.2µF
C3
2.2µF
D8*
M1*
C1: 2.2µF, 25V, X7R, 1206
C2 TO C7: 2.2µF, 50V, X7R, 1206
D1 TO D7: CENTRAL SEMI SOD123F
D8: CENTRAL SEMI CMDSH-3TR
D9: CENTRAL SEMI CMHZ5240B-LTZ
L1: TAIYO YUDEN NR6045T100M
M1: VISHAY SILICONIX SI7611DN
*OPTIONAL,
FOR OUTPUT SHORT-CIRCUIT
PROTECTION
DANGER HIGH VOLTAGE! OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY
Transient Response with 60mA to 140mA to 60mA
Load Step on V
OUT2
(V
IN
= 12V)
V
OUT
AC-COUPLED
2V/DIV
I
LOAD
0.1A/DIV
I
L
0.5A/DIV
3581 TA04b
100µs/DIV
Start-Up Waveforms
V
OUT2
50V/DIV
V
OUT1
50V/DIV
V
SS
1V/DIV
I
L
0.5A/DIV
3581 TA04c
100ms/DIV
Efficiency and Power Loss at V
IN
= 12V
TOTAL OUTPUT POWER (W)
0
70
EFFICIENCY (%)
POWER LOSS (mW)
75
8
90
3581 TA04d
4 201612
80
85
1.0
3.0
1.5
2.0
2.5