Application Note 1829
25
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AN1829.0
March 14, 2013
3. Figure 28 illustrates incorrect waveforms. There should not be
any switching on MB and MC while MA is low. (At the very edge
of MA falling, there may be a small amount of induced
switching noise)
4. While the HA input is grounded, observe that the lab supply
current is < 45mA.
MB OUTPUT TEST
1. Using the 75mm wire, short the HB terminal input to ground.
Led1 should turn on.
2. While the HB input is grounded, observe the following
waveforms on the MA, MB, and MC terminals.
As the example in Figure 27 shows, there should be no switching
disturbances on MC and MA.
3. While the HB input is grounded, observed that the lab supply
current is <45mA.
MB OUTPUT TEST
1. Using the 75mm wire, short the HC terminal input to ground.
Led2 should turn on. After a short pause, led3 will also turn on.
At this point, all four LEDs are on.
2. While the HC input is grounded, observe the following
waveforms on the MA, MB, and MC terminals.
As the example in Figure 27 shows, there should be no switching
disturbances on MB and MA.
3. While the HC input is grounded, observe that the lab supply
current is < 45mA.
Dip Switch Test
1. Move each dip switch, one at a time starting with position 1,
to the off position.
2. Observe that led0, led1, led2, and led3 turn off one at a time
in synchronous with the dip switches being turned off.
Potentiometer Test
1. After a short pause, all LEDs will turn on if the potentiometer
is turned fully to the right (CW). If the LEDs are not on, rotate
the potentiometer to the right until all LEDs turn or when the
potentiometer starts to click. If all LEDs do not turn on, the
board is faulty.
2. After all the LEDs turn on, rotate the potentiometer to the left
(CCW). Observe that led3, led2, led1, and led0 turn off
sequentially as the potentiometer is rotated towards the
minimum voltage setting.
Current Monitor Test
1. This final test is performed automatically after the
potentiometer test. No inputs from the test operator is
necessary. If successful, all four LEDs are sequentially
flashing one at a time. If not successful, all four LEDS flash
simultaneously.
2. The end.
MA
MB
MC
FIGURE 28. WAVEFORMS ON MA, MB, and MC WITH HA GROUNDED
MA
MB
MC
FIGURE 29. WAVEFORMS ON MA, MB, and MC WITH HB GROUNDED
MA
MB
MC
FIGURE 30. WAVEFORMS ON MA, MB, and MC WITH HC GROUNDED
Содержание HIP4086
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