LT1931 데이터 시트보기 (PDF) - Linear Technology
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LT1931 Datasheet PDF : 12 Pages
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LT1931/LT1931A
TYPICAL APPLICATIO S
5V to –12V Inverting Converter
Efficiency
VIN
L1A
10µH
C2
1µF
L1B
10µH
5V
C1
4.7µF
VIN
SW
SHDN
LT1931
NFB
GND
D1
R1
84.5k
R2
10k
VOUT
–12V
150mA
C3
10µF
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R TMK316BJ105ML
C3: TAIYO YUDEN X5R EMK325BJ106MM
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CLS62-100
1931 TA02
100
95
90
85
80
75
70
65
60
55
50
0
25 50 75 100 125 150
LOAD CURRENT (mA)
1931 TA03
5V to – 5V Inverting Converter Using Uncoupled Inductors
VIN
L1
10µH
C2
1µF
L2
10µH
5V
C1
4.7µF
VIN
SW
SHDN
LT1931
NFB
GND
R1
29.4k
R2
10k
D1
220pF
VOUT
–5V
300mA
C3
22µF
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R LMK212BJ105MG
C3: TAIYO YUDEN X5R JMK212BJ226MM
D1: ON SEMICONDUCTOR MBR0520
L1, L2: MURATA LQH3C100K04
2.2MHz, 5V to – 5V Inverting Converter
VIN
L1
4.7µH
C2
1µF
L2
4.7µH
5V
C1
4.7µF
VIN
SW
SHDN
LT1931A
NFB
GND
R1
28.7k
R2
10k
D1
C4
180pF
VOUT
–5V
300mA
C3
4.7µF
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R LMK212BJ105MG
C3: TAIYO YUDEN X5R JMK212BJ475MG
D1: ON SEMICONDUCTOR MBR0520
L1, L2: MURATA LQH3C4R7M24
1931 TA05a
1931 TA04
Efficiency
80
75
70
65
60
55
50
0
50 100 150 200 250 300 350
LOAD CURRENT (mA)
1931 TA05b
1931fa
9
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