Texas Instruments TPS22810EVM, User Manual

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General Configurations
5 SLVUAY7B – November 2016 – Revised January 2018
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TPS22810 Load Switch Evaluation Module
3.3.2 Rise Time Test Setup
Use the following instructions to measure the rise time of the TPS22810 for CH1 (CH2):
1. Uninstall jumper J1 (J5).
2. Set the load resistance to 12
Ω
at terminal T2 (T4) and input supply voltage to 12 V at terminal T1
(T3). Enable the power supply and the load.
3. Apply a square wave (10-Hz frequency with 50% duty cycle) to the EN/UVLO pin at TP6 (TP14) of the
load switch using a function generator.
4. Observe the waveform at VOUT1, TP4 (TP12) with an oscilloscope to measure the slew rate and rise
time of the load switch with a given input voltage of 12 V.
5. Change the default 22-nF CT capacitor C4 (C8) to vary the output voltage rise time.
Figure 3 shows an example of a rise time measurement taken on the TPS22810EVM.
Figure 3. TPS22810 VOUT Rise Profile (VIN = 12 V, CT = 22 nF, COUT = 10 µF, R
L
= 12 Ω )
3.3.3 Quick Output Discharge (QOD) Test Setup
Use the following instructions to measure the VOUT fall time of the TPS22810 for CH1 (CH2):
1. Uninstall jumper J2 (J6) to set QOD = OPEN
2. Set the load resistance to 1000 Ω at terminal T2 (T4) and input supply voltage to 12 V at terminal T1
(T3). Enable the power supply and the load.
3. Apply a square wave (5-Hz frequency with 50% duty cycle) to the EN/UVLO pin at TP6 (TP14) of the
load switch using a function generator.
4. Observe the waveform at VOUT1, TP4 (TP12) with an oscilloscope to measure the fall time of the load
switch.
5. Change the jumper J2 (J6) setting to 1-2 position, which sets 511- Ω external resistance in series with
the QOD pin. Observe the waveform at VOUT1, TP4 (TP12).
6. Change the jumper J2 (J6) setting to 5-6 position to set QOD = VOUT. Observe the waveform at
VOUT1, TP4 (TP12).