MBR2045CT 데이터 시트보기 (PDF) - Motorola => Freescale
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MBR2045CT Datasheet PDF : 6 Pages
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MBR2035CT MBR2045CT
HIGH FREQUENCY OPERATION
Since current flow in a Schottky rectifier is the result of majority
carrier conduction, it is not subject to junction diode forward and
reverse recovery transients due to minority carrier injection and
stored charge. Satisfactory circuit analysis work may be performed
by using a model consisting of an ideal diode in parallel with a
variable capacitance. (See Figure 10.)
Rectification efficiency measurements show that operation will
be satisfactory up to several megahertz. For example, relative
waveform rectification efficiency is approximately 70 percent at
2.0 MHz, e.g., the ratio of dc power to RMS power in the load is
0.28 at this frequency, whereas perfect rectification would yield
0.406 for sine wave inputs. However, in contrast to ordinary
junction diodes, the loss in waveform efficiency is not indicative of
power loss; it is simply a result of reverse current flow through the
diode capacitance, which lowers the dc output voltage.
1500
1000
700
500
MAXIMUM
300
TYPICAL
200
150
0.05 0.1 0.2 0.5 1.0 2.0 5.0 10 20
50
VR, REVERSE VOLTAGE (VOLTS)
Figure 10. Capacitance
+150 V, 10 mAdc
2.0 kΩ
VCC 12 Vdc
12 V
2.0 µs
1.0 kHz
100
2N2222
CURRENT
AMPLITUDE
ADJUST
0–10 AMPS
100
CARBON
D.U.T.
2N6277
+
4.0 µF
1.0 CARBON
1N5817
Figure 11. Test Circuit for dv/dt and
Reverse Surge Current
4
Rectifier Device Data
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