Test Procedure for the NIS5101

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Mariah Jefferson
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1 Test Procedure for the NIS5101 09/06/2004 Board Description: The NIS5101 demo-board has several test points that are used to measure different device functions.

1 1 Test Procedure for the NIS /06/2004 Board Description: The NIS5101 demo-board has several test points that are used to measure different device functions. The test procedure for each of the tests to be performed will be referenced to the test points highlighted in the picture below. Required Test Equipment: Variable Power Supply with at least 10 A of output current capability Second Power Supply 2 Voltmeters Digital Oscilloscope Voltage Probes Current Probes 1) Functionality test The purpose of this test is to check whether the board is operable or not. a) Apply 48 V at the input pins (recommended to use a power supply with at least 10 A of output current capability). b) Connect a voltmeter at the output pins.

2 2 c) Turn-on the switch and measure the voltage at the output. The output voltage should be similar to the input voltage (± 3% variation). If not, then the board should be considered as non-operable. 2) Enable function test The purpose of this test is to check the enable function. This test should be applied only after the board has passed the functionality test. a) Apply 48 V at the input pins (recommended to use a power supply with at least 10 A of output current capability). b) Connect a voltmeter at the output pins and turn-on the switch. The voltmeter should show the output voltage reading. c) Connect a second power supply with common ground to the 48 V power supply, and set the voltage at 5 V. d) Apply the 5 V signal to the enable pin. At this point the output voltage should be close to zero. Finally remove the 5 V signal from the enable pin, and check that the output voltage is back to its original value. 3) UVLO test The purpose of this test is to check the under-voltage function of the device. a) Connect a variable power supply to the input pins (recommended to use a power supply with at least 10 A of output current capability), and set the initial voltage value to zero. b) Connect a voltmeter at the input pins, and another at the output pins. c) Turn-on the switch and increase the supply voltage slowly until finding the point where the device turns-on (device should turn-on between 33 V and 37 V). At this point the output voltage should be similar to the input voltage. d) Reduce the supply voltage slowly until finding the point where the device turns back off (device should turn-off between 28 V and 32 V). At this point the output voltage should be close to zero. 4) OVLO test The purpose of this test is to check the over-voltage function of the device. a) Connect a variable power supply to the input pins (recommended to use a power supply with at least 10 A of output current capability), and set the initial voltage value to 48 V. b) Connect a voltmeter at the input pins, and another at the output pins. c) Turn-on the switch and check that the device is on (output voltage should be similar to input voltage). d) Increase the supply voltage slowly until finding the point where the device turns-off (device should turn-off between 70 V and 80 V). At this point the output voltage should be close to zero. e) Reduce the supply voltage slowly until finding the point where the device turns back on (device should turn-on between 68 V and 76 V). At this point the output voltage should be similar to the input voltage.

3 3 5) Short circuit test The purpose of this test is to evaluate the device s response for a short circuit condition. This test requires a digital oscilloscope, voltage probes, current probes and a power supply with 10 A current capability. a) Attach the oscilloscope s current probe to the input + wire (1 A/div, Ch3), and set the input voltage to 48 V. b) Connect a voltage probe at the input pins (Ch1), and a second one at the output pins (Ch2). Important use the input + as the common pin (ground) for the voltage probes to avoid grounding problems. c) Turn-on the switch and make sure the device has turned-on (output voltage should be similar to the input voltage). d) Set the oscilloscope for a single acquisition function, and apply a short circuit in the output pins by using two small wires. e) Measure the resulting peak current which should be between 3.5 A and 5.5 A. If the device is the auto-retry version (NIS5101E2), the waveform should look like Figure 1 (device keeps auto-retrying). But if the device is the latch-off version (NIS5101E1) then the waveform should look like Figure 2 (device turns-off after it reaches thermal limit). 6) Turn-on Delay time The purpose of this test is to measure the turn-on delay time of the device. This test requires a digital oscilloscope, voltage probes, current probes and a power supply with 10 A current capability. a) Attach the oscilloscopes current probe to the input + wire (1 A/div, Ch3), and set the input voltage to 48 V. b) Connect a voltage probe between pin 1 of the device and ground (Ch1), and a second one at the output pins (Ch2). Important use the input + as the common pin (ground) for the voltage probes to avoid grounding problems.

4 4 c) Connect an electrolytic capacitor of 1,000 uf (100 V) at the output pins, and set the oscilloscope for a single acquisition function. d) Turn-on the switch and measure the turn-on delay time by using the oscilloscope s vertical cursors (Ch3). The turn-on delay time is measured between the point where the input voltage is applied and the point where the device starts conducting current (see Figure 3 for better reference). The delay time should be between 9.0 and 12 ms. 7) Power Good The purpose of this test is to measure the power good signal and the delay time on it. This test requires a digital oscilloscope, voltage probes, current probes and a power supply with 10 A current capability. a) Attach the oscilloscope current probe to the input + wire (1 A/div, Ch3), and set the input voltage at 48 V. b) Connect a voltage probe between pin 1 of the device and ground (Ch1), connect a second voltage probe at the output pins (Ch2), and connect a third one between PwrGd pin and ground (ch4). Important use the input + as the common pin (ground) for the voltage probes to avoid grounding problems. c) Connect an electrolytic capacitor of 1,000 uf (100 V) at the output pins, and set the oscilloscope for a single acquisition function.

5 d) Turn-on the switch and measure the power good delay time by using the oscilloscope s vertical cursors (Ch4). The power good delay time is measured between the point where the output voltage reaches the same level as the input voltage and the point where the power good signal changes its initial stage (see figure 4 for better reference). The power good delay time should be between 3 and 6 ms. 5

LDR_Light_Switch1 -- Overview

LDR_Light_Switch1 -- Overview OBJECTIVES After performing this lab exercise, learner will be able to: Understand the functionality of Light Dependent Resistor (LDR) Use LDR (Light Dependent Resistor) to