SC508 데이터 시트보기 (PDF) - Semtech Corporation
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SC508 Datasheet PDF : 32 Pages
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Typical Characteristics (continued)
Efficiency vs Load — PSAVE Mode
VOUT 1.8V, External 5V bias, 220kHz Frequency
100
90
42V
80
15V 28V
70
60
50
40
30
20
0
1
2
3
4
5
6
7
8
IOUT (ADC)
Efficiency vs Load — Ultrasonic PSAVE Mode
100 VOUT 1.8V, External 5V bias, 220kHz Frequency
90
42V
80
15V
28V
70
60
50
40
30
20
0
1
2
3
4
5
6
7
8
IOUT (ADC)
Efficiency vs Load — Forced Continuous Mode
VOUT 1.8V, External 5V bias, 220kHz Frequency
100
90
42V
80
15V
28V
70
60
50
40
30
20
0
1
2
3
4
5
6
7
8
IOUT (ADC)
SC508/SC508A
Efficiency vs Load — 5V output
VOUT 5V, Internal 5V bias, Power-save, 250kHz Frequency
100
42V
90
15V
28V
80
70
60
50
40
Inductor: Cyntec PCMB104E-4R7MS
30
High side MOSFET: Alpha Omega AO4440
Low side MOSFET: Fairchild FMDS5352
20 0
1
2
3
4
5
6
IOUT (ADC)
Efficiency vs Load — 12V output
VOUT 12V, External 5V bias, Power-save, 400kHz Frequency
100
28V
90
42V
80
70
60
50
40
Inductor: Cyntec PCMB104E-4R7MS
30
High side MOSFET: Fairchild FMDS5352
Low side MOSFET: Fairchild FMDS5352
20
0
1
2
3
4
5
6
IOUT (ADC)
Load Regulation
VOUT 1.8V, External 5V bias, 220kHz Frequency
1.85
1.84
42 VIN
PSAVE
1.83
1.82
1.81
28 VIN
UPSAVE
15 VIN
FCM
1.80
1.79
1.78
1.77
1.76
1.75
0
1
2
3
4
5
6
7
8
IOUT (ADC)
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