The maximum starting current of the 4 normally open oil inlet solenoid valves of the ABS pressure regulator is approximately 3.6 A; the maximum start current of the 4 normally closed oil outlet solenoid valves is approximately 2.4 A. The working voltage of L9349 is 4.5 ～ 32 V, the internal resistance of two channels is O.2 Ω, and 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 driving current of the valve is required, and the low on-resistance can ensure low power consumption, so the L9349 is very suitable for driving control of the ABS solenoid valve. The schematic diagram of the solenoid valve drive circuit is shown in the figure.
In the picture, each piece of L9349 can drive 4 solenoid valves, which is a typical low-end drive. Provide 12 V power supply voltage to the chip through the Vs port; when the input terminal IN1 ~ IN4 PWM control signal, you can easily control the output to drive the 4-way solenoid valve work, the maximum driving capacity of OUT1 and OUT2 ports is 5 A, should Normally closed solenoid valve connected to ABS; the maximum driving capacity of OUT3 and OUT4 ports is 3 A, and should be connected to ABS normally open solenoid valve, which can not be reversed; EN port is the enable terminal, which can quickly turn off the chip through the MCU; Simulatively separated, improving the anti-interference ability of the drive module.
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