SS6639 데이터 시트보기 (PDF) - Silicon Standard Corp.
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SS6639 Datasheet PDF : 12 Pages
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SS6639
n ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER
Oscillator Duty Cycle
Max. Oscillator Freq.
Efficiency
TEST CONDITIONS
VIN=VOUT x 0.95
Measurement of the EXT Pin
Waveform
VIN=VOUT x 0.95
Measurement of the EXT Pin
Waveform
SYMBOL MIN. TYP. MAX. UNIT
DUTY 65
75
85
%
FOSC
80
η
105 130 KHz
80
%
n TYPICAL PERFORMANCE CHARACTERISTICS
Inductor (L1): 33µH (Pin Type)
Capacitor (C1): 47µF (Tantalum Type)
Diode (D1): 1N5819 Schottky Type
Transistor (Q1): 2SD1803
2.80
2.75
2.70
VI N = 2.0
V
2.65
VI N = 1.8V
2.60
V IN = 1.2
V
VI N = 1.5
V
2.55
2.50
2.45 VIN=0.9V
2.40
0
50 100 150 200 250 300 350 400 450 500
Output Current (mA)
Fig. 1 SS6639-27 Load Regulation (L=33µH)
90
85
80
VI N = 2.0V
75
V IN =1.8V
70
VI N = 1.5V
65
VIN= 1.2V
60
V IN = 0.9V
55
50
0 50 100 150 200 250 300 350 400 450 500
Output Current (mA)
Fig. 2 SS6639-27 Efficiency (L=33uH)
3.1
3.0
VIN=2.0V
2.9
2.8
VIN=1.2V VIN=1.5V VIN=1.8V
2.7
VIN=0.9V
2.6
2.5
2.4
0
50 100 150 200 250 300 350 400 450
Output Current (mA)
Fig. 3 SS6639-30 Load Regulation (L=33µH)
90
85
VIN=2.0V
80
VIN=1.8V
75
VIN=1.5V
70
VIN=1.2V
65
VIN=0.9V
60
0
50 100 150 200 250 300 350 400 450
Output Current (mA)
Fig. 4 SS6639-30 Efficiency (L=33µH)
Rev.2.01 6/26/2003
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