MBRF2045CT(2008) Ver la hoja de datos (PDF) - ON Semiconductor

Número de pieza

componentes Descripción

Fabricante

MBRF2045CT
(Rev.:2008)

SCHOTTKY BARRIER RECTIFIER 20 AMPERES, 45 VOLTS

ON Semiconductor 

MBR2045CT, MBRF2045CT

HIGH FREQUENCY OPERATION

Since current flow in a Schottky rectifier is the result of

majority carrier conduction, it is not subject to junction di-

ode forward and reverse recovery transients due to minority

carrier injection and stored charge. Satisfactory circuit ana-

lysis work may be performed by using a model consisting

of an ideal diode in parallel with a variable capacitance.

(See Figure 12.)

Rectification efficiency measurements show that opera-

tion will be satisfactory up to several megahertz. For ex-

ample, relative waveform rectification efficiency is ap-

proximately 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 di-

odes, 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.

1000

900

800

700

600

500

400

300

200

100

0

0

TJ = 25°C

f = 1 MHz

10

20

30

40

50

VR, REVERSE VOLTAGE (VOLTS)

Figure 12. Typical Capacitance

+150 V, 10 mAdc

2.0 kW

VCC 12 Vdc

12 V

2.0 ms

1.0 kHz

100

2N2222

CURRENT

AMPLITUDE

ADJUST

0-10 AMPS

100

CARBON

D.U.T.

+

4.0 mF

2N6277

1.0 CARBON

1N5817

Figure 13. Test Circuit for dv/dt and Reverse Surge Current

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