Categories

App note: Simulating fast transient loads for testing power supplies

Posted on Saturday, December 22nd, 2012 in app notes by DP

752Fig01

How to implement a fast load transient simulator for power supply testing. One of important factor of power supplies is how they react to fast changing loads. This article describes how to design a system that measures power supply performance under quickly changing loads.

To obtain fast load transients, we combine a power MOSFET and a couple of resistors right on the PC board of the device under test (DUT). Choosing the components is relatively easy. If the output voltage is positive, an n-channel MOSFET works great. The MOSFET is connected with a resistor from the source to ground (see Figure 1). The MOSFET’s gate is terminated with a 51Ω resistor to impedance-match the signal generator’s output.

This entry was posted on Saturday, December 22nd, 2012 at 9:00 pm and is filed under app notes. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

Leave a Reply

Notify me of followup comments via e-mail. You can also subscribe without commenting.

Recent Comments