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SOT223-3 Voltage Regulator Evaluation Board User’s Guide
10. Add a load selection jumper, JP4 or JP5.
11. Read the Ground Current directly from the ammeter connected to the testpoints
TP6 and TP7.
12. The data collected will be the “ground current” versus load current.
2.3.2
Load Resistance
R5 and R6 are used to set the desired load values. One choice is to set R5 to the
minimum current wanted for testing. R6 would then be set to a value appropriate for the
specific tests. Either value may be selected by adding their respective jumpers.
2.3.3
Line Step
Dynamic Line Step response may be evaluated by connecting an electronically
switched input voltage to testpoints TP1(+) and TP2(-) or to connector J1.
An oscilloscope is connected to TP3 (Ch1 Trigger), TP9 (Ch2) and TP10 (Gnd). An
appropriate load is selected using R5 and JP4 or R6 and JP5. The input voltage is then
electronically switched from a low voltage to a higher one. The corresponding voltage
waveform data of the voltage regulator response is captured by the oscilloscope.
Microchip will be offering a Line Step module that connects directly to connector J1.
The Line Step module will be capable of switching between two voltage levels that the
user supplies.
2.3.4
Load Step
Dynamic Load Step response may be evaluated by connecting an electronically
switched load to testpoints TP9(+) and TP10(-), or to connector P1. An oscilloscope is
connected to the electronic load switch signal (Ch1 Trigger), to TP9 (Ch2) and
TP10(Gnd). The load is then electronically switched from a high resistance to a low
resistance. The corresponding voltage waveform data of the voltage regulator
response is captured by the oscilloscope. Microchip will be offering a Load Step module
that connects directly to connector P1. The Load Step module has several selectable
load values populated on board to cover a wide range of loads. The load has the ability
to be electronically or manually switched.
2.3.5
Power Supply Rejection Ratio (PSRR)
Power Supply Rejection Ratio tests are performed by removing the input capacitor
jumper, JP1, and connecting an appropriate PSRR analyzer to the SOT223-3 Voltage
Regulator Evaluation Board. The PSRR analyzer may then sweep the input voltage
frequencies and record the corresponding output voltages.
DS51779A-page 8
? 2008 Microchip Technology Inc.
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