ST AN2795 APPLICATION NOTE

AN2795

Application note

VNI4140K load test report

Introduction

The tests described in this application note were carried out to check the VNI4140K parameters and driving capabilities of different types of problematic loads such as bulb and inductor.

The VNI4140K device is a quad high-side smart power state relay intended for driving four independent resistive or inductive loads with built-in current limitation and thermal shutdown.

Figure 1 shows the test configuration. The STEVAL-IFP006V1, based on the VNI4140K, was chosen for the measurements. The parameters of the test were set as follows:

Power supply:	1. 10.5 V; 2. 24 V; 3. 36 V
Generator:	freq. = 1 Hz, duty cycle = 50%
Load:	1. bulb 24 V/15 W; 2. inductor 130 mH/48 Ω; 3. short-circuit.

Figure 1. Test block diagram

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February 2011

Doc ID 14836 Rev 1

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Contents	AN2795

Contents

1	Bulb load tests			. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 5
	1.1	Bulb, 10.5		V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	1.2	Bulb, 10.5		V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	1.3	Bulb, 24	V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		7
	1.4	Bulb, 24	V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		8
	1.5	Bulb, 36	V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		9
	1.6	Bulb, 36	V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		10

2	Inductive load tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .				11
	2.1	Inductor, 10.5		V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	2.2	Inductor, 10.5		V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
	2.3	Inductor, 24	V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		15
	2.4	Inductor, 24	V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		17
	2.5	Inductor, 36	V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		19
	2.6	Inductor, 36	V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		21

3	Short-circuit tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		23
	3.1	Short-circuit, 10.5 V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	23
	3.2	Short-circuit, 10.5 V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	24
	3.3	Short-circuit, 24 V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	25
	3.4	Short-circuit, 24 V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
	3.5	Short-circuit, 36 V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27
	3.6	Short-circuit, 36 V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28
4	Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		29
5	Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		29
6	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		29

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AN2795	List of tables

List of tables

Table 1. Test data (bulb, 10.5 V, 1 channel)

(VCC = 10.5 V; load - 1 bulb; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Table 2. Test data (bulb, 10.5 V, 4 channels)

(VCC = 10.5 V; load - 4 bulbs; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 3. Test data (bulb, 24 V, 1 channel)

(VCC = 24 V; load - 1 bulb; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 4. Test data (bulb, 24 V, 4 channels)

(VCC = 24 V; load - 4 bulbs; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 5. Test data (bulb, 36 V, 1 channel)

(VCC = 36 V; load - 1 bulb; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 6. Test data (bulb, 36 V, 4 channels)

(VCC = 36 V; load - 4 bulbs; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 7. Test data (inductor, 10.5 V, 1 channel)

(VCC = 10.5 V; load - 1 inductor; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 8. Test data (inductor, 10.5 V, 4 channels)

(VCC = 10.5 V; load - 4 inductors; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 9. Test data (inductor, 24 V, 1 channel)

(VCC = 24 V; load - 1 inductor; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 10. Test data (inductor, 24 V, 4 channels)

(VCC = 24 V; load - 4 inductors; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 11. Test data (inductor, 36 V, 1 channel)

(VCC = 36 V; load - 1 inductor; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 12. Test data (inductor, 36 V, 4 channels)

(VCC = 36 V; load - 4 inductors; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 13. Test data (short-circuit, 10.5 V, 1 channel)

(VCC = 10.5 V; load - 1 short-circuit; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 14. Test data (short-circuit, 10.5 V, 4 channels)

(VCC = 10.5V; load - 4 short-circuits; T = 25 °C). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Table 15. Test data (short-circuit, 24 V, 1 channel)

(VCC = 24 V; load - 1 short-circuit; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Table 16. Test data (short-circuit, 24 V, 4 channels)

(VCC = 24 V; load - 4 short-circuits; T = 25 °C). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Table 17. Test data (short-circuit, 36 V, 1 channel)

(VCC = 36V; load - 1 short-circuit; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Table 18. Test data (short-circuit, 36 V, 4 channels)

(VCC = 36 V; load - 4 short-circuits; T = 25 °C). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Table 19. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

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List of figures	AN2795

List of figures

Figure 1.	Test block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 1
Figure 2.	Switching waveform (bulb, 10.5 V, 1 channel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 5
Figure 3.	Switching waveform (bulb, 10.5 V, 4 channels) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 6
Figure 4.	Switching waveform (bulb, 24 V, 1 channel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 7
Figure 5.	Switching waveform (bulb, 24 V, 4 channels) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 8
Figure 6.	Switching waveform (bulb, 36 V, 1 channel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 9
Figure 7.	Switching waveform (bulb, 36 V, 4 channels) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
Figure 8.	Switching waveform (inductor, 10.5 V, 1 channel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
Figure 9.	Switching waveform (inductor, 10.5 V, 1 channel, turn-off detail) . . . . . . . . . . . . . . . . . . .	12
Figure 10.	Switching waveform (inductor, 10.5 V, 4 channels) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
Figure 11.	Switching waveform (inductor, 10.5 V, 4 channels, turn-off detail) . . . . . . . . . . . . . . . . . .	14
Figure 12.	Switching waveform (inductor, 24 V, 1 channel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
Figure 13.	Switching waveform (inductor, 24 V, 1 channel, turn-off detail) . . . . . . . . . . . . . . . . . . . . .	16
Figure 14.	Switching waveform (inductor, 24 V, 4 channels) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
Figure 15.	Switching waveform (inductor, 24 V, 4 channels, turn-off detail) . . . . . . . . . . . . . . . . . . . .	18
Figure 16.	Switching waveform (inductor, 36 V, 1 channel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	19
Figure 17.	Switching waveform (inductor, 36 V, 1 channel, turn-off detail) . . . . . . . . . . . . . . . . . . . . .	20
Figure 18.	Switching waveform (inductor, 36 V, 4 channels) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	21
Figure 19.	Switching waveform (inductor, 36 V, 4 channels, turn-off detail) . . . . . . . . . . . . . . . . . . . .	22
Figure 20.	Switching waveform (short-circuit, 10.5 V, 1 channel) . . . . . . . . . . . . . . . . . . . . . . . . . . . .	23
Figure 21.	Switching waveform (short-circuit, 10.5 V, 4 channels) . . . . . . . . . . . . . . . . . . . . . . . . . . .	24
Figure 22.	Switching waveform (short-circuit, 24 V, 1 channel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	25
Figure 23.	Switching waveform (short-circuit, 24 V, 4 channels) . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
Figure 24.	Switching waveform (short-circuit, 36 V, 1 channel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27
Figure 25.	Switching waveform (short-circuit, 36 V, 4 channels) . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28

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AN2795	Bulb load tests

1 Bulb load tests

1.1Bulb, 10.5 V, 1 channel

Table 1.	Test data (bulb, 10.5 V, 1 channel)
	(VCC = 10.5 V; load - 1 bulb; T = 25 °C)
Time [min]		Utot [V]	Itot [A]		Uch [V]	Ich [A]	Tcase [°C]
5		10.4	0.381		10.3	0.376	25.1
15		10.4	0.383		10.3	0.377	25.6
30		10.4	0.382		10.4	0.376	26.0
60		10.4	0.382		10.4	0.377	26.1

Figure 2. Switching waveform (bulb, 10.5 V, 1 channel)(1)

1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.

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Bulb load tests	AN2795

1.2Bulb, 10.5 V, 4 channels

Table 2.	Test data (bulb, 10.5 V, 4 channels)
	(VCC = 10.5 V; load - 4 bulbs; T = 25 °C)
Time [min]		Utot [V]	Itot [A]		Uch [V]	Ich [A]	Tcase [°C]
5		10.3	1.405		9.9	0.365	25.9
15		10.3	1.408		10.0	0.365	26.6
30		10.3	1.409		10.0	0.366	27.0
60		10.3	1.408		10.0	0.366	27.2

Figure 3. Switching waveform (bulb, 10.5 V, 4 channels)(1)

1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.

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AN2795	Bulb load tests

1.3Bulb, 24 V, 1 channel

Table 3.	Test data (bulb, 24 V, 1 channel)
	(VCC = 24 V; load - 1 bulb; T = 25 °C)
Time [min]		Utot [V]	Itot [A]		Uch [V]	Ich [A]	Tcase [°C]
5		23.9	0.629		23.8	0.617	36.6
15		23.9	0.629		23.8	0.617	38.4
30		23.9	0.628		23.7	0.616	38.8
60		23.9	0.628		23.7	0.616	38.8

Figure 4. Switching waveform (bulb, 24 V, 1 channel)(1)

1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.

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Bulb load tests	AN2795

1.4Bulb, 24 V, 4 channels

Table 4.	Test data (bulb, 24 V, 4 channels)
	(VCC = 24 V; load - 4 bulbs; T = 25 °C)
Time [min]		Utot [V]	Itot [A]		Uch [V]	Ich [A]	Tcase [°C]
5		23.6	2.301		23.2	0.600	46.5
15		23.6	2.306		23.2	0.599	48.8
30		23.6	2.307		23.2	0.599	50.8
60		23.6	2.306		23.2	0.599	51.1

Figure 5. Switching waveform (bulb, 24 V, 4 channels)(1)

1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.

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AN2795	Bulb load tests

1.5Bulb, 36 V, 1 channel

Table 5.	Test data (bulb, 36 V, 1 channel)
	(VCC = 36 V; load - 1 bulb; T = 25 °C)
Time [min]		Utot [V]	Itot [A]		Uch [V]	Ich [A]	Tcase [°C]
5		35.8	0.767		33.8	0.751	74.9
15		35.9	0.769		33.8	0.752	79.1
30		35.9	0.769		33.8	0.753	80.8
60		35.9	0.769		33.9	0.753	80.8

Figure 6. Switching waveform (bulb, 36 V, 1 channel)(1)

1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.

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