LT1931 データシートの表示（PDF） - Linear Technology
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LT1931 Datasheet PDF : 12 Pages
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LT1931/LT1931A
TYPICAL APPLICATIO S
2.2MHz, 5V to –5V Converter Uses Tiny Chip Inductors
VIN
L1
3.3µH
C2
1µF
L2
3.3µH
5V
C1
2.2µF
VIN
SW
SHDN
LT1931A
NFB
GND
R1
28.7k
R2
10k
D1
C4
68pF
VOUT
–5V
200mA
C3
4.7µF
C1: TAIYO YUDEN X5R JMK212BJ225MG
C2: TAIYO YUDEN X5R LMK212BJ105MG
C3: TAIYO YUDEN X5R JMK212BJ475MG
D1: ON SEMICONDUCTOR MBR0520
L1, L2: PANASONIC ELJPC3R3MF
1931 TA06a
Efficiency
80
75
70
65
60
55
50
0
50 100 150 200 250
LOAD CURRENT (mA)
1931 TA06b
SLIC Power Supply with – 33V and – 68V Outputs, Uses Soft-Start
VIN
12V
C1
4.7µF
16V
L1
R1
22µH
1Ω
VIN
SW
RSS
15k
VSS
LT1931
SHDN
NFB
GND
R2
CSS
1k
68nF
R3
25.5k
C6
1000pF R4
2.7k
*TOTAL OUTPUT POWER NOT TO EXCEED 3.3W
C1 TO C5: X5R OR X7R
D1, D2: BAV99 OR EQUIVALENT
L1: SUMIDA CR43-220
C2
1µF
35V
D1
3
2
1
C3
1µF
35V D2
3
2
1
C4
4.7µF
35V
COM
VOUT1
–33V
100mA*
C5
4.7µF
35V
VOUT2
–66V
1931 TA08 48mA*
1931fa
10
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