Load regulation: This converts an inputted DC voltage into a stable DC output voltage even if the output current is varying. • Load transient response: This ...
Quick DC and Transient Evaluation of Switching Mode DC-DC Converter B2900A Series of Precision Source/Measure Units DC Evaluation of DC-DC Converters Multimeter DC VoltageBs2o9ur1c2eA (front view) This two-pager outlines an example of load regulation and load Multimeter transient responseDC Voltage source characterization for an off-the-shelf switching mode DC-DC converter. · Load regulation: This converts an inputted DC voltage into a stable DC output voltage even if the output current is varying. · Load transient response: This is the variation or glitching that occurs in the output when the output load undergoes transient changes. A dual-channel SMU (Source/Measure Unit) such as tIhNe B2902A DoUr TB2912A is aOnUT ideal choice for these types of measurements. B2912A (rear view) RL The B2900A Series is BenchVue Software enabled. Bench-top setup example for 4-terminal DUT Multimeter Multimeter DC Voltage source DC Voltage source Channel 2 on the back side Channel 1 RL IN DUT OUT IN DUT OUT SMU setup example for 4-terminal DUT Bench-top setup example for 4-terminal DUT B2900A Series of SMU reduces the number of instruments and eliminates messy wiring Find us at www.keysight.com Channel 2 on the back side Page 1 Measurement Examples It is easy to estimate load regulation by measuring the output voltage drift while sweeping the output load current. The load transient response can be monitored by measuring the output voltage transient when a pulsed current load is applied. In the example shown below, Ch 1 applies a constant voltage (12 V) to the input while Ch 2 either sweeps current to test load regulation or applies pulsed current to test the load transient response. Note: Channel 1's high capacitance mode is ON in this example. B2912A A Ch1 LTM8047 IN Vin C1 RUN C2 R1 BIAS ADJ SS GND Vout Vout 725VDC Isolation 5V C3 R2 B2912A V Ch2 DUT (LTM8047 on DC1693 Demo circuit Module) Note: LTM8047 and DC1693 Demo circuit are products of LINEAR TECHNOLOGY Example 1: Load Regulation with 4-wire Measurement Technique Sweeping the load current from 25 mA to 175 mA using a 4-wire Kelvin probe set shows stable measurement results1. Since the demo circuit board has an offset load of 25 mA, this is equivalent to testing the load regulation from 50 mA to 200 mA (the device's desired test condition). Moreover, since both the X and Y axes have two cursors available, you can easily readout the data and the variation from the display. Note: 4-wire Kelvin probes with both sense and force outputs as shown in the measurement setup on the previous page are required for this type of measurement. 1. The displayed current increases in negative value as you go from right to left. Find us at www.keysight.com Page 2 Output voltage Load regulation can be read as be read as 30 mV under 150 mA output current change Output load current Load regulation measurement result Sense Force Kelvin measurement setup How Broad is the B2900A SMU Series' Capability? Sufficient to meet almost all bench-top evaluation needs! Product number B2901A B2902A B2911A B2912A Number Max output of channel DC Pulse 1 210 V 200 V 3.03 A 10.5 A 2 210 V 200 V 3.03 A 10.5 A 1 210 V 200 V 3.03 A 10.5 A 2 210 V 200 V 3.03 A 10.5 A Min source resolution 1 pA 1 µV 1 pA 1 µV 10 fA 100 nV 10 fA 100 nV Min measure resolution 100 fA 100 nV 100 fA 100 nV 10 fA 100 nV 10 fA 100 nV Min timing interval 20 µs 20 µs 10 µs 10 µs Viewing mode Single, Graph Single, Dual, Graph Single, Graph, Roll Single, Dual, Graph, Roll Find us at www.keysight.com Page 3 Example 2: Load Transient Response with 10 s Sampling This shows the load transient response as measured using the minimum 10 s 2 sampling interval of the B2912A. In this example the load current is changed from 100 mA to 200 mA for 5 msec and then returned to its original 100 mA value. The cursors' delta data shows that the transient undershoot is about 175 mV and its duration is about 1 ms. Note: The B2900A SMU series have the ability to observe a 100 s level transient 2. The minimum sampling interval of the B2901A/02A is 20 s. Output voltage 100 mV Load current 100 mA 1 ms Load transient response 200 mA Load transient undershoot voltage can be read as 175 mV in 1 ms duration Time (s) Load transient response measurement result Multiple Free Software Control Options The B2900A series also offers Multiple free software control options, allowing you to choose the solution that best fits your particular application Find us at www.keysight.com Page 4 Related Applications · LDO-Low Dropout regulator (measurement of output source/sink current capabilities) · Linear regulator (measurement of output source/sink current capabilities) · Op amp (measurement of output source/sink current capabilities) · Other linear ICs requiring current source/sink capabilities www.keysight.com/find/b2900a Learn more at: www.keysight.com For more information on Keysight Technologies' products, applications or services, please contact your local Keysight office. The complete list is available at: www.keysight.com/find/contactus Find us at www.keysight.com This information is subject to change without notice. © Keysight Technologies, 2013 - 2019, Published in USA, August 30, 2019, 5991-3119EN Page 5Adobe PDF Library 15.0 Adobe InDesign 14.0 (Windows)