1N5817 1N5818 1N5819

5

Rectifier Device Data

NOTE 4 — HIGH FREQUENCY OPERATION

Since current flow in a Schottky rectifier is the result of majority carri-

er conduction, it is not subject to junction diode forward and reverse re-

covery 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.

10

20

0.8

70

200

100

50

30

20

10

6.0

4.0

2.0

1.0

0.6

8.0

0.4

40

VR, REVERSE VOLTAGE (VOLTS)

Figure 10. Typical Capacitance

TJ = 25°C

f = 1.0 MHz

1N5819

1N5818

1N5817