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 1/30

www.st.com

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

2/30 Doc ID 14836 Rev 1

AN2795 List of tables

List of tables

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

= 10.5 V; load - 1 bulb; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 2. Test data (bulb, 10.5 V, 4 channels)

Table 3. Test data (bulb, 24 V, 1 channel)

Table 4. Test data (bulb, 24 V, 4 channels)

Table 5. Test data (bulb, 36 V, 1 channel)

Table 6. Test data (bulb, 36 V, 4 channels)

Table 7. Test data (inductor, 10.5 V, 1 channel)

Table 8. Test data (inductor, 10.5 V, 4 channels)

Table 9. Test data (inductor, 24 V, 1 channel)

Table 10. Test data (inductor, 24 V, 4 channels)

Table 11. Test data (inductor, 36 V, 1 channel)

Table 12. Test data (inductor, 36 V, 4 channels)

Table 13. Test data (short-circuit, 10.5 V, 1 channel)

Table 14. Test data (short-circuit, 10.5 V, 4 channels)

Table 15. Test data (short-circuit, 24 V, 1 channel)

Table 16. Test data (short-circuit, 24 V, 4 channels)

Table 17. Test data (short-circuit, 36 V, 1 channel)

Table 18. Test data (short-circuit, 36 V, 4 channels)

Table 19. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

= 10.5 V; load - 4 bulbs; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

= 24 V; load - 1 bulb; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

= 24 V; load - 4 bulbs; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

= 36 V; load - 1 bulb; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

= 36 V; load - 4 bulbs; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

= 10.5 V; load - 1 inductor; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

= 10.5 V; load - 4 inductors; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

= 24 V; load - 1 inductor; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

= 24 V; load - 4 inductors; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

= 36 V; load - 1 inductor; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

= 36 V; load - 4 inductors; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

= 10.5 V; load - 1 short-circuit; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

= 10.5V; load - 4 short-circuits; T = 25 °C). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

= 24 V; load - 1 short-circuit; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

= 24 V; load - 4 short-circuits; T = 25 °C). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

= 36V; load - 1 short-circuit; T = 25 °C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

= 36 V; load - 4 short-circuits; T = 25 °C). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Doc ID 14836 Rev 1 3/30

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

4/30 Doc ID 14836 Rev 1

AN2795 Bulb load tests

1 Bulb load tests

1.1 Bulb, 10.5 V, 1 channel

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

= 10.5 V; load - 1 bulb; T = 25 °C)

Time [min] U

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

[V] I

tot

[A] U

tot

[V] I

[A] T

case

[°C]

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

(1)

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

Doc ID 14836 Rev 1 5/30

Bulb load tests AN2795

1.2 Bulb, 10.5 V, 4 channels

Table 2. Test data (bulb, 10.5 V, 4 channels)

= 10.5 V; load - 4 bulbs; T = 25 °C)

Time [min] U

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

[V] I

tot

[A] U

tot

[V] I

[A] T

case

[°C]

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

(1)

1. CH1: supply current, CH2: channel voltage, C H3: channel current, CH4: supply voltage.

6/30 Doc ID 14836 Rev 1

AN2795 Bulb load tests

1.3 Bulb, 24 V, 1 channel

Table 3. Test data (bulb, 24 V, 1 channel)

= 24 V; load - 1 bulb; T = 25 °C)

Time [min] U

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

[V] I

tot

[A] U

tot

[V] I

[A] T

case

[°C]

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

(1)

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

Doc ID 14836 Rev 1 7/30

Bulb load tests AN2795

1.4 Bulb, 24 V, 4 channels

Table 4. Test data (bulb, 24 V, 4 channels)

= 24 V; load - 4 bulbs; T = 25 °C)

Time [min] U

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

[V] I

tot

[A] U

tot

[V] I

[A] T

case

[°C]

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

(1)

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

8/30 Doc ID 14836 Rev 1

AN2795 Bulb load tests

1.5 Bulb, 36 V, 1 channel

Table 5. Test data (bulb, 36 V, 1 channel)

= 36 V; load - 1 bulb; T = 25 °C)

Time [min] U

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

[V] I

tot

[A] Uch [V] Ich [A] T

tot

case

[°C]

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

(1)

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

Doc ID 14836 Rev 1 9/30

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