AN2208
APPLICATION NOTE
Designing Industrial Applications with
VN808/VN340SP High-side Drivers
Introduction
This application note describes the functions of VN808/VN340SP high-side drivers in industrial
applications. The VN340SP and VN808 are monolithic devices based on VIPower technology. With
primary application requirements being safety and reliability, this application note covers the various tests
used to ensure compliance with international electromagnetic compatibility (EMC) specifications as well
as other requirements.
VN808/VN340SP high-side drivers are tested mounted on their respective reference design board (RDB).
Note:
Figure 1.
Additional information concerning the L5970D DC/DC converter, based on BCD technology, is
included in
Section Appendix C: L5970D DC/DC converter on page 46.
VN808 and VN340SP reference design boards
September 2005
Rev. 1
1/51
http:/www.st.com
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AN2208
Contents
1
2
High-side driver description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
VN808 reference design board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1
2.2
2.3
2.4
2.5
Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Surge suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Isolation recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Heatsink recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Schematic diagrams
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3
VN340SP reference design board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1
3.2
Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Schematic diagrams
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4
5
6
Load switching tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Thermal stress tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Electromagnetic compatibility (EMC) tests . . . . . . . . . . . . . . . . . . . . . . . . 22
6.1
6.2
6.3
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
List of EMC test equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Requested test levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.3.1
6.3.2
6.3.3
IEC 61000-4-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
IEC 61000-4-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
IEC 61000-4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.4
IEC 61000-4-4 EFT test setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.4.1
6.4.2
6.4.3
Power supply tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Input port tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Output port tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.5
IEC 61000-4-5 surge test setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.5.1
6.5.2
Power supply tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Output port tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.6
IEC 61000-4-6 conducted immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.6.1
Power supply tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
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AN2208
6.6.2
6.6.3
Input port tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Output port tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7
Test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.1
VN808 HSD test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.1.1
7.1.2
7.1.3
Load switching test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Thermal stress test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
EMC test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.2
VN340SP HSD test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7.2.1
7.2.2
7.2.3
Load switching test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Thermal stress test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
EMC test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Appendix A VN808 reference design board (RDB) . . . . . . . . . . . . . . . . . . . . . . . 42
A.1
A.2
VN808 RDB bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Recommended VN808 PCB Layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Appendix B VN340SP reference design board (RDB) . . . . . . . . . . . . . . . . . . . . . 44
B.1
B.2
VN340SP RDB bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Recommended VN340SP RDB PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . 45
Appendix C L5970D DC/DC converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
C.1
C.2
C.3
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
L5970D layout recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
L5970D DC/DC converter load test results . . . . . . . . . . . . . . . . . . . . . . . . . . 48
8
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
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List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
Figure 31.
Figure 32.
Figure 33.
Figure 34.
Figure 35.
Figure 36.
Figure 37.
Figure 38.
Figure 39.
Figure 40.
VN808 and VN340SP reference design boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
VN808 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
VN340SP block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
VN808 reference design board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Surge Suppression Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical input/status isolation by optocouplers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Burst pulse affecting one input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Recommended layout for High Power Dissipation capability . . . . . . . . . . . . . . . . . . . . . . . 12
DC/DC part of the application circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Current and voltage conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Complete application circuit with VN808 and L5970D devices. . . . . . . . . . . . . . . . . . . . . . 13
Switching part of the application circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
VN340SP reference design board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Switching part of the application circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Complete application circuit with VN340SP and L5970D devices . . . . . . . . . . . . . . . . . . . 17
Description of the switching inductor loads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
IPS simplified structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Simplified thermal models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Power supply tests (IEC 61000-4-4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Switch diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Test on input ports (IEC 61000-4-4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Output port tests (IEC 61000-4-4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Power supply tests (IEC 61000-4-5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Test on Output Ports (IEC 61000-4-5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Power supply tests (IEC 61000-4-6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Input port tests (IEC 61000-4-6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Output port tests (IEC 61000-4-6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
VN808 Waveforms (Part 1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
VN808 Waveforms (Part 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
GND_Power disconnection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Switching lamps: VCC = 24V, f = 0.5 Hz, Wave1 = VINOPT,
Wave2 = VOUT, Wave4 = ICH1OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Waveform tOFF inductor load: VCC = 24V, L = 130mH, RLOAD = 63W,
tOFF = 1.2101 ms, Wave2 = VOUT, Wave1 = VINOPT, Wave4 = ICH1OUT . . . . . . . . . . 32
Waveform switching inductive load: VCC = 24V, L = 130mH, RLOAD = 48W,
f = 0.5Hz, Wave2 = VOUT, Wave1 = VINOPT, Wave4 = ICH1OUT . . . . . . . . . . . . . . . . . 33
Switching with short circuit: VCC = 24V, f = 0.5Hz, Wave2 = VSTATUSOPT,
Wave1 = VINOPT, Wave4 = ICH1OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Time delay between VINOPT and VOUT: VCC = 24V, Load = Lamp,
Wave2 = VOUT, Wave3 = VINOPT, Dt = 58.462 µs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
GND_Power disconnection for VN808: VCC = 25V, Load = Lamp,
Wave1 = VCC, Wave2 = VOUT, Wave3 = GND of power supply . . . . . . . . . . . . . . . . . . . 33
Waveform ITOT and VINOPT during the test with short circuit VCC = 28V,
TA = 85°C, Wave4 = ITOT, Wave1 = VINOPT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Waveform on ITOT and VINOPT during the test with short circuit VCC = 28V,
TA = –25°C, Wave4 = ITOT, Wave1 = VINOPT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Case temperature dependency vs. current ITOT (TA = 25°C and VCC = 24 V) . . . . . . . . 34
Burst applied on the power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
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Figure 41.
Figure 42.
Figure 43.
Figure 44.
Figure 45.
Figure 46.
Figure 47.
Figure 48.
Figure 49.
Figure 50.
Figure 51.
Figure 52.
Figure 53.
Figure 54.
Figure 55.
Figure 56.
Figure 57.
Figure 58.
Figure 59.
Figure 60.
Figure 61.
Figure 62.
Figure 63.
Burst applied on the output channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Positive surge applied on power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Negative surge applied on power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Switching lamps: Vcc = 24V, f = 0.5Hz, Wave3 = VINOPT,
Wave2 = VOUT, Wave4 = ICH1OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Waveform tOFF inductor load: Vcc = 24V, L = 130mH, RLOAD = 60W,
tOFF = 1.2276ms, Wave2 = VOUT, Wave3 = VINOPT, Wave4 = ICH1OUT. . . . . . . . . . . 38
Time delay between VINOPT and VOUT: Vcc = 24V, Load = Lamp,
Wave2 = VOUT, Wave3 = VINOPT, Dt = 139µs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Switching with short circuit: Vcc = 24V, f = 0.5Hz, Wave2 = VSTATUSOPT,
Wave3 = VINOPT, Wave4 = ICH1OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Waveform switching inductive load: Vcc = 24V, L = 130mH, RLOAD = 48W,
f = 0.5Hz, Wave2 = VOUT, Wave3 = VINOPT, Wave4 = ICH1OUT . . . . . . . . . . . . . . . . . 39
Switching with short circuit: Vcc = 24V, f = 0.5Hz, Wave2 = VSTATUSOPT,
Wave3 = VINOPT, Wave4 = ICH1OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Waveform ITOT and VSTATUSOPT during the test with short circuit:
Vcc = 28V, TA = 85°C, Wave4 = ITOT, Wave1 = VSTATUSOPT . . . . . . . . . . . . . . . . . . . 39
Waveform on ITOT and VSTATUSOPT during the test with short circuit:
Vcc = 28V, TA = –25°C, Wave4 = ITOT, Wave1 = VSTATUSOPT . . . . . . . . . . . . . . . . . . 39
VN808 RDB PCB layout (top and bottom) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
VN808 RDB PCB layout (component side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
VN340SP RDB PCB layout (Top side) and (Bottom side) . . . . . . . . . . . . . . . . . . . . . . . . . 45
VN340SP RDB PCB layout (component side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
L5970D block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
L5970 DC/DC converter layout example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Efficiency vs. output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Output voltage stability of L5970D, Vss = 24 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Voltage ripple on capacitor C30, IOUTDC = 0.4A, Vss = 24V . . . . . . . . . . . . . . . . . . . . . . 49
Waveform on coil L1, IOUTDC = 0.4A, Vss = 24V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Voltage ripple on capacitor C33, Vss = 24V, IOUTDC = 0.4 A . . . . . . . . . . . . . . . . . . . . . . 49
Waveform on coil L1, without load, Vss = 24V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
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