DC motor drive solution using TC118S domestic chip

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DC motor drive solution using TC118S domestic chip [Copy link]

This solution uses the domestic TC118S DC motor driver chip. The entire solution does not require external large filter capacitors, only small chip capacitors, and has a low BOM cost. It can be used in daily applications such as electric toys, electronic locks, electric toothbrushes, and electric tea sets.

Figure 1. Circuit diagram

The power supply voltage of the solution is VCC=2.4-7.2V, the control input voltage range is 0-VCC, the forward and reverse input current IOUT=-1500~1500, it has forward, reverse, stop and brake functions, the maximum continuous output current can reach 1.8A, and the peak current can reach 2.5A.

Design considerations

In different applications, only one of C1 and C2 can be considered: in 3V applications, it is recommended to use a 1uF or above capacitor; in 4.5V applications, it is recommended to use a 4.7uF or above capacitor, both of which are chip capacitors; in 6V applications, it is recommended to use a large capacitor 220uF+100nF chip capacitor.

C2 should be placed close to the VDD pin of the IC, and the connection between the negative electrode of the capacitor and the GND terminal of the IC should be as short as possible. That is, the wiring and routing should not be too far away even though the capacitor is close (refer to Figure 2).

When there is a large capacitor on the application board that is filtering other chips and is far away from TC118S, a small capacitor should be placed on the VDD pin of TC118S as required above. Among them, C4 (100nF) capacitor is preferably connected to the motor. When it is inconvenient to solder this capacitor on the motor, it should be placed on the PCB.

Figure 2. PCB layout diagram

The circuit is powered by a battery, and the instantaneous current value when the motor starts is recommended not to exceed the chip's peak value of 2.5A.

BOM components

The TC118S in this solution is a single-channel DC motor driver chip, which is packaged in DIP-8 and SOP-8. It has low on-resistance (1.6Ω), built-in power MOS full-bridge driver and hysteresis thermal effect overheating protection function, the maximum system power consumption is 1W, and the operating temperature is -20～+85℃.

BOM components list

serial number	name	Specification	quantity	factory	Remark
C1	MLCC	220uF	1	Domestic
C2	MLCC	100nF	1	Domestic
U1	TC118S	DIP-8, SOP-8	1	Fuman Electronics
C3	MLCC	104pF	1	Domestic
C4	MLCC	104pF	1	Domestic
other	-Batteries, etc.	-	-	Domestic

TC118S is designed and manufactured using MOS technology and is sensitive to static electricity. It is required to take anti-static measures during the entire process of packaging, transportation, processing and production. All capacitors in the BOM are MLCC and the power supply is dry battery.

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What software was used to create the PCB wiring diagram in Figure 2?