The maximum starting current of the four normally open oil solenoid valves of the ABS pressure regulator is about 3.6 A; the maximum starting current of the four normally closed oil solenoid valves is about 2.4 A. The operating voltage of L9349 is 4.5~32 V, the internal resistance of the two channels is O.2 Ω, the maximum load current is 3 A; the other two internal resistances are 0.3 Ω, and the maximum load current is 5 A, which can meet the ABS normally open and normally closed electromagnetic The valve's drive current requirements and low turn-on internal resistance ensure low power consumption, so the L9349 is ideal for ABS solenoid valve drive control. The schematic diagram of the solenoid valve drive circuit is shown in the figure.
Multi-channel solenoid valve drive circuit composed of L9349
In the figure, each L9349 can drive 4 solenoid valves, which is a typical low-end drive. The 12 V supply voltage is supplied to the chip through the Vs port; when the PWM control signals are input to the IN1 to IN4 terminals, the output terminal can be conveniently controlled to drive the 4-way solenoid valve, and the maximum drive capability of the OUT1 and OUT2 ports is 5 A. Normally closed solenoid valve connected to ABS; OUT3 and OUT4 ports have a maximum drive capacity of 3 A, should be connected to ABS normally open solenoid valve, can not be connected reverse; EN port is the enable end, can quickly close the chip through MCU; digital ground of L9349 The analog ground separation improves the anti-interference ability of the drive module.
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