ST AN2985 APPLICATION NOTE

AN2985

Application note

STEVAL-IFP010V2: designing with VNI2140J dual high-side smart power solid-state relay IC

Introduction

The STEVAL-IFP010V2 demonstration board has been developed to show the VNI2140J device functionalities within industrial applications such as PLCs (programmable logic controllers) which drive lamps, valves, relays, and similar loads.

This tool allows evaluating VNI2140J features, in particular embedded self-protection, power-handling capabilities, operation and diagnostic feedback, thermal behavior and conformity to EMC immunity standards.

Figure 1. STEVAL-IFP010V2

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A double-sided PCB allows obtaining the best trade-off between a routing solution and thermal management results.

The main features of the demonstration board are:

●Two output channels (2 x 1 A)

●Two input channels

●Two feedback channels for fault and open load diagnostics

●Bidirectional opto-isolated interface for MCU safe connection

●TTL/CMOS compatible signals for MCU direct connection

●LEDs to indicate outputs

●Compliance to IEC61000-4-4 and IEC61000-4-5 standards

●Compatibility with existing STMicroelectronics tools (IBU communication board, CANIC10, for example) 10.5 V to 36 V DC power supply voltage range demonstration board description

November 2009

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Contents	AN2985

Contents

1	STEVAL-IFP010V2 demonstration board . . . . . . . . . . . . . . . . . . . . . . . .		5
	1.1	Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	1.2	Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	1.3	VNI2140J - device overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	1.4	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	1.5	Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8

1.5.1 STEVAL-IFP010V2 electrical schematic . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.5.2 STEVAL-IFP010V2 connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.5.3 STEVAL-IFP010V2 thermal management . . . . . . . . . . . . . . . . . . . . . . . 10

2	EMC immunity tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		12
	2.1	Test conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
	2.2	Burst immunity test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
	2.3	Surge test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13

Appendix A STEVAL-IFP010V2 bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Appendix B STEVAL-IFP010V2 PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Appendix C Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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AN2985	List of tables

List of tables

Table 1. STEVAL-IFP010V2 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 2. J1 and J5 pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 3. Burst setup configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table 4. Burst test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 5. Surge test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 6. STEVAL-IFP010V2 bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 7. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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List of figures	AN2985

List of figures

Figure 1. STEVAL-IFP010V2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 2. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 3. STEVAL-IFP010V2 top view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 4. STEVAL-IFP010V2 bottom view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 5. STEVAL-IFP010V2 schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 6. J1 connector pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 7. J5 connector pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 8. STEVAL-IFP010V2 PCB copper heatsink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 9. Thermal map in steady-state condition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 10. Thermal map in demagnetization condition (1 Hz repetitive cycling on 1.2 H 48 W load) . 11 Figure 11. Steady-state thermal behavior, 3D simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 12. Repetitive demagnetization thermal behavior, 3D simulation (1 Hz repetitive cycling on

48 W 1.2 H load). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 13. Burst timing waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 14. Surge standard timing waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 15. STEVAL-IFP010V2 component layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Figure 16. STEVAL-IFP010V2 copper top layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Figure 17. STEVAL-IFP010V2 copper bottom layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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1 STEVAL-IFP010V2 demonstration board

1.1Safety precautions

The board must be used only by expert technicians. The copper areas around the VNI2140J device have a heat sink function, visible in the top layer layout view, refer to Figure 8. In case of short-circuit, current limitation or hard demagnetization, the STEVAL-IFP010V2 board, or part of it, might reach a very high temperature with consequent danger.

No specific protections are implemented for a reverse DC accidental connection. Remember that an electrolytic capacitor is connected to the supply bus, therefore a reverse continuous DC voltage applied to it may produce a dangerous explosion.

Warning: ST assumes no responsibility for any consequences which may result from the improper use of this tool.

1.2Description

The STEVAL-IFP010V2 demonstration board is composed of two main sections:

●An opto-isolated interface for input and status signals

●A two-channel self-protected power stage section with STMicroelectronics Transil™ diode protection.

The demonstration board consists of a double-sided FR4 printed circuit board with 35 µm copper plating. The PCB dimensions are 52 mm X 68 mm. The top and bottom view are shown in Figure 3 and 4, respectively.

1.3VNI2140J - device overview

The VNI2140J is a monolithic two-channel driver featuring a very low supply current. The IC, which uses STMicroelectronics VIPower technology, is intended for driving loads with one side connected to ground. Active channel current limitation, combined with thermal shutdown (independent for each channel) and automatic restart, protect the device against overload.

The main features of the VNI2140J IC are:

●Output current: 1 A per channel

●Shorted load protections for each channel

●Junction overtemperature protection for thermal independence of the channels

●Case overtemperature protection and restart are not simultaneous for the two channels

●Protection against ground disconnection

●Current limitation

●Undervoltage shutdown

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STEVAL-IFP010V2 demonstration board	AN2985

●Open load in off state and short to Vcc detection

●Open drain diagnostic outputs

●3.3 V CMOS/TTL compatible inputs

●Fast demagnetization of inductive loads

●Conforms to IEC 61131-2

Figure 2. Block diagram

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Active current limitation avoids that the system power supply drops in case of a shorted load. In overload condition, the channel turns off and back on automatically after the IC temperatures decreases below a threshold set by a temperature hysteresis so that junction temperature is controlled.

If this condition makes the case temperature reach the case temperature limit (TCSD), overloaded channels are turned off (i.e. the channels for which junction temperature has exceeded the junction protection threshold, TjSD, and has not fallen below the junction protection reset threshold, TjR). These channels restart, non-simultaneously, only when the case temperature decreases below the case protection reset threshold (TCR). Nonoverloaded channels continue to operate normally.

The open drain diagnostic outputs indicate related channel overtemperature conditions.

1.4Electrical characteristics

The electrical characteristics of the VNI2140J demonstration board (STEVAL-IFP010V2) are given in Table 1.

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