AN2208 datasheet(34/51 Pages) STMICROELECTRONICS

Part #	AN2208

Description	Designing Industrial Applications with

PDF	51 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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7 Test results

AN2208

34/51

Figure 37 and Figure 38 illustrate thermal behavior by showing the waveform of ITOT current to

HSD during the short circuit with different ambient temperature. The input is switched at 1 Hz.

The thermal shutdown is active and the output channel is switched off because it is shorted.

The maximum case temperature with maximum current ITOT is 42°C during normal operation

(without short circuit) as shown in Figure 39.

Note:

The temperature measured in thermal chamber using the FLUKE 189 multimeter and thermo-

coupler. No airflow present during the test.

Figure 37. Waveform ITOT and VINOPT during

the test with short circuit VCC = 28V,

TA = 85°C, Wave4 = ITOT,

Wave1 = VINOPT

Figure 38. Waveform on ITOT and VINOPT during

the test with short circuit VCC = 28V,

TA = –25°C, Wave4 = ITOT,

Wave1 = VINOPT

Figure 39. Case temperature dependency vs. current ITOT (TA = 25°C and VCC = 24 V)

AN2208 Datasheet(PDF) 34 Page - STMicroelectronics