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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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Contents
AN2795
Contents
1
2
3
Bulb load tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
Bulb, 10.5 V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2
Bulb, 10.5 V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3
Bulb, 24 V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4
Bulb, 24 V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5
Bulb, 36 V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.6
Bulb, 36 V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Inductive load tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1
Inductor, 10.5 V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2
Inductor, 10.5 V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2.3
Inductor, 24 V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.4
Inductor, 24 V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.5
Inductor, 36 V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.6
Inductor, 36 V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Short-circuit tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.1
Short-circuit, 10.5 V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.2
Short-circuit, 10.5 V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.3
Short-circuit, 24 V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.4
Short-circuit, 24 V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.5
Short-circuit, 36 V, 1 channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.6
Short-circuit, 36 V, 4 channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5
Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
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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) (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
1.2
AN2795
Bulb, 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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1.3
Bulb load tests
Bulb, 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
1.4
AN2795
Bulb, 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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1.5
Bulb load tests
Bulb, 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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Bulb load tests
1.6
AN2795
Bulb, 36 V, 4 channels
Table 6. Test data (bulb, 36 V, 4 channels) (VCC = 36 V; load - 4 bulbs; T = 25 °C)
Time [min]
Utot [V]
Itot [A]
Uch [V]
Ich [A]
Tcase [°C]
5
35.5
2.891
34.2
0.748
105.6
15
35.5
2.891
34.2
0.748
110.2
30
(1)
60
(1)
1. Thermal shutdown activated (thermal cycling).
Figure 7. Switching waveform (bulb, 36 V, 4 channels)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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Inductive load tests
2
Inductive load tests
2.1
Inductor, 10.5 V, 1 channel
Table 7. Test data (inductor, 10.5 V, 1 channel) (VCC = 10.5 V; load - 1 inductor;
T = 25 °C)
Time [min]
Utot [V]
Itot [A]
Uch [V]
Ich [A]
Tcase [°C]
5
10.5
0.211
10.4
0.209
24.9
15
10.5
0.210
10.4
0.208
25.1
30
10.5
0.210
10.4
0.208
25.2
60
10.5
0.210
10.4
0.208
25.3
Figure 8. Switching waveform (inductor, 10.5 V, 1 channel)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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Inductive load tests
AN2795
Figure 9. Switching waveform (inductor, 10.5 V, 1 channel, turn-off detail)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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2.2
Inductive load tests
Inductor, 10.5 V, 4 channels
Table 8. Test data (inductor, 10.5 V, 4 channels) (VCC = 10.5 V; load - 4 inductors;
T = 25 °C)
Time [min]
Utot [V]
Itot [A]
Uch [V]
Ich [A]
Tcase [°C]
5
10.4
0.822
10.2
0.204
25.6
15
10.4
0.820
10.2
0.204
26.0
30
10.4
0.819
10.2
0.203
26.3
60
10.4
0.819
10.2
0.204
26.7
Figure 10. Switching waveform (inductor, 10.5 V, 4 channels)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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Inductive load tests
AN2795
Figure 11. Switching waveform (inductor, 10.5 V, 4 channels, turn-off detail)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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2.3
Inductive load tests
Inductor, 24 V, 1 channel
Table 9. Test data (inductor, 24 V, 1 channel) (VCC = 24 V; load - 1 inductor; T = 25 °C)
Time [min]
Utot [V]
Itot A]
Uch [V]
Ich [A]
Tcase [°C]
5
23.9
0.422
23.8
0.420
25.8
15
23.9
0.429
23.8
0.426
26.2
30
23.9
0.430
23.8
0.427
26.5
60
23.9
0.430
23.8
0.427
26.7
Figure 12. Switching waveform (inductor, 24 V, 1 channel)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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Inductive load tests
AN2795
Figure 13. Switching waveform (inductor, 24 V, 1 channel, turn-off detail)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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2.4
Inductive load tests
Inductor, 24 V, 4 channels
Table 10. Test data (inductor, 24 V, 4 channels) (VCC = 24 V; load - 4 inductors;
T = 25 °C)
Time [min]
Utot [V]
Itot [A]
Uch [V]
Ich [A]
Tcase [°C]
5
23.8
1.690
23.5
0.423
30.6
15
23.8
1.655
23.5
0.418
31.9
30
23.8
1.659
23.5
0.420
32.3
60
23.8
1.658
23.5
0.420
32.5
Figure 14. Switching waveform (inductor, 24 V, 4 channels)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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Inductive load tests
AN2795
Figure 15. Switching waveform (inductor, 24 V, 4 channels, turn-off detail)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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2.5
Inductive load tests
Inductor, 36 V, 1 channel
Table 11. Test data (inductor, 36 V, 1 channel) (VCC = 36 V; load - 1 inductor; T = 25 °C)
Time [min]
Utot [V]
Itot [A]
Uch [V]
Ich [A]
Tcase [°C]
5
35.9
0.578
35.8
0.572
28.0
15
35.9
0.572
35.8
0.565
28.5
30
35.9
0.572
35.8
0.566
28.7
60
35.9
0.573
35.8
0.568
28.8
Figure 16. Switching waveform (inductor, 36 V, 1 channel)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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Inductive load tests
AN2795
Figure 17. Switching waveform (inductor, 36 V, 1 channel, turn-off detail)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
18/28
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2.6
Inductive load tests
Inductor, 36 V, 4 channels
Table 12. Test data (inductor, 36 V, 4 channels) (VCC = 36 V; load - 4 inductors;
T = 25 °C)
Time [min]
Utot [V]
Itot [A]
Uch [V]
Ich [A]
Tcase [°C]
5
35.7
1.250
35.3
0.566
36.5
15
35.7
1.183
35.3
0.556
38.1
30
35.7
1.185
35.3
0.555
38.6
60
35.7
1.186
35.3
0.555
38.8
Figure 18. Switching waveform (inductor, 36 V, 4 channels)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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Inductive load tests
AN2795
Figure 19. Switching waveform (inductor, 36 V, 4 channels, turn-off detail)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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Short-circuit tests
3
Short-circuit tests
3.1
Short-circuit, 10.5 V, 1 channel
Table 13. Test data (short-circuit, 10.5 V, 1 channel) (VCC = 10.5 V; load - 1
short-circuit; T = 25 °C)
Time [min]
Utot [V]
Itot [A]
Uch [V]
Ich [A]
Tcase [°C]
5
9.7
1.025
0.0
1.019
111.3
15
9.7
1.028
0.0
1.022
112.6
30
9.7
1.026
0.0
1.020
112.9
60
9.7
1.026
0.0
1.020
113.1
Figure 20. Switching waveform (short-circuit, 10.5 V, 1 channel)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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Short-circuit tests
3.2
AN2795
Short-circuit, 10.5 V, 4 channels
Table 14. Test data (short-circuit, 10.5 V, 4 channels) (VCC = 10.5V; load - 4 shortcircuits; T = 25 °C)
Time [min]
Utot [V]
Itot [A]
Uch [V]
Ich [A]
Tcase [°C]
5
9.3
4.102
0.0
1.024
103.1
15
9.3
4.104
0.0
1.025
103.5
30
9.3
4.103
0.0
1.024
103.8
60
9.3
4.105
0.0
1.025
103.9
Figure 21. Switching waveform (short-circuit, 10.5 V, 4 channels)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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3.3
Short-circuit tests
Short-circuit, 24 V, 1 channel
Table 15. Test data (short-circuit, 24 V, 1 channel) (VCC = 24 V; load - 1 short-circuit;
T = 25 °C)
Time [min]
Utot [V]
Itot [A]
Uch [V]
Ich [A]
Tcase [°C]
5
23.3
0.964
0.0
0.958
109.1
15
23.3
0.965
0.0
0.959
109.4
30
23.3
0.965
0.0
0.959
109.6
60
23.3
0.967
0.0
0.961
109.7
Figure 22. Switching waveform (short-circuit, 24 V, 1 channel)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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Short-circuit tests
3.4
AN2795
Short-circuit, 24 V, 4 channels
Table 16. Test data (short-circuit, 24 V, 4 channels) (VCC = 24 V; load - 4 short-circuits;
T = 25 °C)
Time [min]
Utot [V]
Itot [A]
Uch [V]
Ich [A]
Tcase [°C]
5
23.3
2.512
0.0
0.627
102.3
15
23.3
2.511
0.0
0.626
102.4
30
23.3
2.513
0.0
0.627
102.5
60
23.3
2.514
0.0
0.627
102.5
Figure 23. Switching waveform (short-circuit, 24 V, 4 channels)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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3.5
Short-circuit tests
Short-circuit, 36 V, 1 channel
Table 17. Test data (short-circuit, 36 V, 1 channel) (VCC = 36V; load - 1 short-circuit;
T = 25 °C)
Time [min]
Utot [V]
Itot [A]
Uch [V]
Ich [A]
Tcase [°C]
5
35.5
0.652
0.0
0.646
108.4
15
35.5
0.653
0.0
0.647
109.2
30
35.5
0.653
0.0
0.647
109.8
60
35.5
0.655
0.0
0.649
110.2
Figure 24. Switching waveform (short-circuit, 36 V, 1 channel)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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Short-circuit tests
3.6
AN2795
Short-circuit, 36 V, 4 channels
Table 18. Test data (short-circuit, 36 V, 4 channels) (VCC = 36 V; load - 4 short-circuits;
T = 25 °C)
Time [min]
Utot [V]
Itot [A]
Uch [V]
Ich [A]
Tcase [°C]
5
35.5
1.720
0.0
0.429
101.0
15
35.5
1.722
0.0
0.429
101.1
30
35.5
1.724
0.0
0.430
101.2
60
35.5
1.725
0.0
0.430
101.2
Figure 25. Switching waveform (short-circuit, 36 V, 4 channels)(1)
1. CH1: supply current, CH2: channel voltage, CH3: channel current, CH4: supply voltage.
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4
Conclusion
Conclusion
The device proved its full compliance and functionality under these more difficult conditions.
5
6
Reference
1.
VNI4140K datasheet.
2.
AN2684 application note.
Revision history
Table 19. Document revision history
Date
Revision
Changes
09-Feb-2011
1
Initial release.
18-Mar-2013
2
Updated Section 4: Conclusion.
DocID14836 Rev 2
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AN2795
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