L9374 four channel valve driver

The L9374 is a four channel low side driver with integrated recirculation diodes. The switching of the channels is programmable via a SPI (serial peripheral interface). The main time base is given by an external clock via CLKin. The clock unit monitors this external clock and provides the system clock for all timings.

A synchronization unit is used to monitor the SPI communication and provides a sync signal for the channel activation.

The output duty cycle for each channel can be programmed individually and will be activated by the set point unit. Is possible to program two output duty cycles per channel with a block of 16 SPI commands as well as an individual duration time for each channel actuation. Both information are stored in the PWM and in the counter configuration register respectively.

The PWM controller translates the programmed digital duty cycle value in a PWM signal which controls the output.

For the current controlled channels the target current value is programmed. It is also possible to program two different target currents. The target current is compared with the real load current. The output duty cycle is then calculated with an arithmetic logic unit. As base for the calculation a load model is used respecting the resistivity of the load, the supply voltage as well as the internal recirculation path. To check the plausibility of the current controller all measured and calculated values are available and accessible via SPI.

All channels are equipped with a load diagnostic. This allows to detect an open load in off condition as well as an under current in on condition. The power stage is protected against over current and over temperature. A weak connection in power ground or in the recirculation path is monitored. All monitored functions can be read out in a serial diagnostic protocol dedicated for each channel via SPI.

技术特性

Four low-side output drivers with protection diagnostic
- 2 PWM controlled channels (0.2 Ω typ.)
- 2 current controlled channels with 6 % accuracy (0.3 Ω typ.)
All outputs with 35 V zener clamp
Programmable channel timer
Clock monitor
Integrated recirculation diodes
Serial peripheral interface with 16 bits, up to 5 MHz with diagnosis
Battery compatible supply voltage
Detailed load diagnosis
- Overload protection
- Open load
- Undercurrent
- Undervoltage
- Temperature warning and shutdown
- Power or signal GND loss
- Freewheeling diode loss
- Silent valve driver test

功能框图

L9374 订购信息

订购型号	产品状态	美金价格	数量	封装	包装形式	温度范围	材料声明
L9374	Preview	5.929	1000	PowerSO 36	Tube		L9374
L9374-TR	Active	5.929	1000	PowerSO 36	Tape And Reel		L9374-TR

APPLICATION NOTES

描述	版本	大小
AN2804: Virtual current control loop for L9374-L9375 coil driver kit in ABS-ESC control unit	1	812KB

DATA BRIEF

描述	版本	大小
DB0304 : Four channel valve driver	2	405KB