SLVSE17A May 2019 – April 2020 TPS1HB16-Q1
Another typical bulb test is to have the bulb at room temperature (25°C) and the device heated up to 105°C. This test is designed see if the device can drive the bulb without hitting thermal shutdown due to the current draw of the bulbs. The passing criteria is that the bulb illuminates when the device enables the channel and the device does not go into thermal shutdown. Figure 49 shows the current waveform of this test and as it can be seen the bulb comes on and stays on without hitting thermal shutdown. Notice that the current is lower in this condition than the inrush condition. This is due to the bulb's effective capacitance being lower at higher temperatures as expected.