AL8807EV4

Issue 2 – May 2012

© Diodes Incorporated 2012

www.diodes.com

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Observe Switching Waveform

5.

The switching waveform can be observed on an oscilloscope.

6.

Set the oscilloscope as follows:

Channel 1 sensitivity:

2V/div (at probe tip)

Time base:

1µs/div

Trigger Source:

CH1

Trigger Mode:

Auto

7.

Connect the ground lead of a 10x probe to the supply negative terminal near P2 of the

AL8807EV4, and touch the probe tip onto the anode of D1 as in Figure 2 below. On the

oscilloscope, press RUN/STOP to capture the waveform. The cursor readout indicates a

switching frequency of 440kHz approximately.

Figure 2:

Figure 3: Oscilloscope Waveform

DMM

2

A

POWER SUPPLY

+

-

P2

P1

K

DMM

1

A

A