VN808

The VN808 is the first octal single chip high-side driver developed in VIPower M0-3 technology. Both the control and power stage use N-MOS technology. VN808 has 8 different channels with single protection and diagnostic functions integrated on a single chip. The VN808 has been developed considering the needs of the industrial process control market. High-power capability PowerSO-36; V cc /2 compatible inputs; Junction over-temperature protection; Case over-temperature protection for thermal independence of the channel; Current limitation; Shorted load protection; Under-voltage shutdown; Protection against loss of ground; Very low stand-by current; Compliance with 6100-4-4 IEC test up to 4.4kV. The VN808 has built-in junction over-temperature protection which is thermally independent for each of the eight channels, it has a current limitation (1.1A typical), and a fast demagnetization block clamped at –52V typical. Thanks to the built-in protection each channel is self-protected against load short-circuiting and overloading. The device is able to manage large inductive loads, however care must be taken of the power dissipation related to the switching frequency in free-wheeling conditions. Both undervoltage protection and loss of ground protection with shutdown are added. For the very first time a case over-temperature protection is integrated into the VIPower switch. The typical RDS(on) of the VN808 is 150mΩ per channel at 25°C, while the operating voltage is inside the industrial range of 10.5V to 45V. Undervoltage Vcc VN808 Input 1 Input 2 Logic Clamp VCC -OUT Clamp GND Current lim. Double integrated thermal protection exists in VN808 in the form of: Junction temperature detection (TTSD) and protection, related to the single channel; Case temperature detection (TCSD) and protection, related to the whole device dissipation. The case temperature protection avoids PCB degradation if a large number of channels are overloaded. In fact the TCSD acts only on the overloaded channel; channels that are not overloaded continue to operate normally. VCC Lamps OUT X8 Input 8 Status Junction Temp Detection Case Temp. Detec. SPI Valves VN808 internal block diagram BUS ASIC CL CSLK RX TX VN808 VCC [V] 10.5 to 36 Relays VDSS [V] 41 RDS(on) [mΩ] 8 x 150 IOUT [A] 0.7 VN808 in a typical programmable logic controller application www.st.com/vipower