A DC-DC Converter is used to generate output supply voltage
that is either higher or lower than the input voltage by minimizing energy loss due to the conversion.
The load regulation is one of the basic characteristics of DC-DC Converter circuit.
In this video, I'd like to show you load regulation measurement example
using DC1693 demo circuit module of a DC-DC Converter.
This DC-DC Converter module is a product of Linear Technology.
Traditionally, it is usual to use multiple instruments which have a single function
such as a digital multimeter, a power supply, and an electronic load to evaluate DC-DC Converter circuit.
However, it also forces you to change the messy wiring every time you measure each parameter.
Recently, you can make most of DC-DC Converter evaluations with a single instrument
and don't have to change wiring or don't have to stack multiple instruments on your limited bench-top space,
since the B2900A Series Precision Source/Measure Unit, SMU, has multiple functions in a single instrument.
In order to measure load regulation characteristics using the B2912A,
the channel 1 and 2 of the B2912A are connected to the input and output terminals of the demo circuit module respectively.
4-wire connection should be used for both channels,
because test current of the DC-DC Converter is relatively high.
Since demo circuit module has load capacitance between its input terminals,
High Capacitance Mode should be enabled on the channel 1.
Constant voltage is sourced from the channel 1 to the input terminal.
Limit value is also set to prevent the circuit from breaking down due to unexpected current.
High Capacitance mode has to be disabled on the channel 2 to use current source mode on it.
Then Output-Off State of the channel 2 is set to "High Impedance" for the DC-DC Converter evaluation.
Current source mode on the channel 2 has to be selected to sink current.
The source value should be set to the start value of the sweep.
Since the polarity of current on the instrument is shown from the instrument's viewpoint,
the current from the circuit to the instrument should be set to negative on the instrument.
Limit value is also set to prevent the circuit from breaking down due to unexpected voltage.
The output current is stepped from 50 mA to 150 mA with 2 mA step using the instrument's sweep function.
Please note that the channel 2 has to sink current from 25 mA to 125 mA actually,
since the demo circuit module has load resistance on its output terminals.
After setting up the channels, press On/Off button for both channels to enable the outputs.
And then press Trigger button to start measurements.
The measurement result can be seen graphically in Graph View on the instrument.
In this video, it was shown how to make load regulation measurement of the DC-DC Converter circuit
using the Agilent B2912A Precision Source/Measure Unit.
In the next video, I'd like to show you how to make load transient measurement.
If you'd like to have more information, you can visit our website currently shown here.
Thank you.