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| AATIAN22 Datasheet, PDF (5/11 Pages) SiGe Semiconductor, Inc. – 3MHz Fast Transient 400mA Step-Down Converter | |||
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EV-139
AAT1149 EVAL: 3MHz Fast Transient
400mA Step-Down Converter
Test: Load Transient Response
1. Configure the specified test equipment as shown in Figure 4.
2. Enable UUT by connecting the jumper to the âONâ position.
3. Generate the step output load using a PWM (set VPP = 5V at 5KHz), a power MOSFET, and adjustable
resistors (R7, R8).
4. Adjust R7 and R8 to get the designed output current while monitoring the step output current and the out-
put voltage response (AC coupling) on the oscilloscope.
5. Repeat step 4 for different output current steps and over the ranges of VIN and VOUT.
Iload
Vout(AC)
Figure 4: AAT1149 Evaluation Board Connection Diagram for Load Transient Response.
EV-139.2007.08.1.0
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