Datasheet

LT3579/LT3579-1
34
35791fa
For more information www.linear.com/LT3579
TYPICAL APPLICATION
V
OUT
–12V
1.2A
C
OUT
10µF
×2
L1
3.3µH
L2
3.3µH
C1
4.7µF
D1
V
IN
5V
V
IN
SW1 SW2
35791 TA14
LT3579
71.5k
20k
143k
100k
FAULT
SHDN
FB
GATE
CLKOUT
VC
SYNC GND SS
RT
1nF
0.22µF
27pF
C
IN
22µF
C
IN
: 22µF, 16V, X7R, 1210
C1: 4.7µF, 25V, X7R, 1206
C
OUT
: 10µF, 25V, X7R, 1210
D1: DIODES INC B230A
L1,
L2: COOPER BUSSMANN DRQ125-3R3-R
LOAD CURRENT (A)
0
20
EFFICIENCY (%)
POWER LOSS (W)
60
70
80
90
50
40
30
100
0
1.6
2
2.4
2.8
1.2
0.8
0.4
3.2
0.5 0.75 1 1.250.25
35791 TA15
1.2MHz, 5V to -12V Inverting Converter
Efficiency and Power Loss Transient Response with 0.5A to 1A to 0.5A Output Load Step
100µs/DIV
V
OUT
500mV/DIV
AC COUPLED
I
L1
+ I
L2
1A/DIV
I
LOAD
1A/DIV
35791
TA16