MBR2035CT MBR2045CT

4

Rectifier Device Data

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.

2.0

µs

1.0 kHz

12 V

100

VCC

12 Vdc

2N2222

CURRENT

AMPLITUDE

ADJUST

0–10 AMPS

100

CARBON

2N6277

1.0 CARBON

1N5817

D.U.T.

2.0 k

Ω

+150 V, 10 mAdc

4.0

µF

+

VR, REVERSE VOLTAGE (VOLTS)

0.5

1500

1000

500

300

150

0.1

0.05

50

700

Figure 10. Capacitance

0.2

2.0

1.0

5.0

200

MAXIMUM

TYPICAL

10

20

Figure 11. Test Circuit for dv/dt and

Reverse Surge Current