LT1931/LT1931A
典型应用S
5V至-12V反相转换器
L1A
10µH
C2
1µF
L1B
10µH
100
95
90
V
IN
5V
V
IN
SHDN
C1
4.7µF
效率(%)
SW
LT1931
NFB
GND
R2
10k
R1
84.5k
C1 :太阳诱电X5R JMK212BJ475MG
C2 :太阳诱电X5R TMK316BJ105ML
C3 :太阳诱电X5R EMK325BJ106MM
D1 : ON SEMICONDUCTOR MBR0520
L1 : SUMIDA CLS62-100
V
IN
5V
V
IN
SHDN
C1
4.7µF
C1 :太阳诱电X5R JMK212BJ475MG
C2 :太阳诱电X5R LMK212BJ105MG
C3 :太阳诱电X5R JMK212BJ226MM
D1 : ON SEMICONDUCTOR MBR0520
L1 , L2 : MURATA LQH3C100K04
2.2MHz的, 5V到 - 5V反相转换器
L1
4.7µH
C2
1µF
L2
4.7µH
80
75
V
IN
5V
V
IN
SHDN
C1
4.7µF
LT1931A
NFB
GND
R1
28.7k
R2
10k
C4
180pF
效率(%)
SW
C1 :太阳诱电X5R JMK212BJ475MG
C2 :太阳诱电X5R LMK212BJ105MG
C3 :太阳诱电X5R JMK212BJ475MG
D1 : ON SEMICONDUCTOR MBR0520
L1 , L2 : MURATA LQH3C4R7M24
U
效率
D1
V
OUT
–12V
150mA
C3
10µF
85
80
75
70
65
60
55
1931年TA02
50
0
25
75
100
50
负载电流(mA )
125
150
1931年TA03
5V反相转换器使用非耦合电感器 - 5V至
L1
10µH
C2
1µF
L2
10µH
D1
SW
LT1931
NFB
GND
R2
10k
R1
29.4k
220pF
V
OUT
–5V
300mA
C3
22µF
1931年TA04
效率
D1
V
OUT
–5V
300mA
C3
4.7µF
70
65
60
55
1931年TA05a
50
0
50
100 150 200 250
负载电流(mA )
300
350
1931年TA05b
1931fa
9