feature

Wide operating voltage range: 4V to 28V

Locking Motor Protection with Open Collector

Alarm or slow down and retry automatically

Compact Package: 8-SOP-225

illustrate

FAN8412M /FAN8413M are monolithic integrated circuits, suitable for DC blower motor drive.

typical application

DC cooling fan motor

absolute maximum ratio

Note 1:

PCB condition: thickness (1.6mm), size (76.2mm*114.3mm)

Reference: EIA/J SED 51-2 and EIA/J SED 51-3

Should not exceed PD or ASO values

Power dissipation curve (air conditioner = 0 m/s)

Electrical Characteristics

(Ta=25°C, VCC=12V, unless otherwise specified

application information

1. Lock detection and automatic restart

The FAN8412M/FAN8413M feature lock detection and auto-restart. The function operation is as follows. When the rotor is locked, there is no change in the input signal to the Hall amplifier. A capacitor (CLD) connected to the LD pin is continuously charged to the intrrnal threshold (VLDCL) by the internal current source (ILDC). When the VCLD voltage on the LD pin reaches VLDCL, the output power TR turns off to float high at TOFF and the alarm output (AL) goes high or the taco output (taco) goes to stay high or low. When VCLD reaches the upper threshold, VLDCL, VCLD begins to decrease, and the internal current sink (ILDD) reaches the low threshold, VLDCP. At that time the VCLD charging is repeated until the locked state is released, or the fan 8412M/fan 8413M is powered off. The automatic restart time (TON) and motor protection time (TOFF) are proportional to the external capacitor, CLD, and each value can be calculated as follows:

For example, CLD=1uF, then TON=0.57 seconds, TOFF=2.2 seconds. This AL or TACO output can be used to inform the Super IO or system controller of stall status or speed information. Because the AL or TACO output is an open collector type, the end user can pull this pin to the supply voltage of their choice (i.e. 5 or 3.3V) with an external resistor

2. Hall amplifier input module

The Hall current (IH) is determined by R1, R2 and R3.

where R2 is the impedance of the Hall sensor. External capacitor C1 can be used to reduce power supply noise. Also, C2 will eliminate if the line from the hall sensor output to the device's hall input (pins 2/4) is long. The input bias voltage of the Hall amplifier is between 1V and VCC-2V as shown in the figure below

It is recommended that R1 and R3 have the same value to center the output signal of the Hall sensor with VCC/2.

Typical Application Circuit 1 (12V/24V)

1d1: A reverse protection diode for integrated circuits.

2.D2: The reverse protection diode of the motor coil.

3. D3/D4: Zener diodes for free rotation.

4. R1/R2: Resistors that set the DC Hall bias level.

5. R3/R4: Resistors that limit the base current of the external power supply TR.

6.R5: Pull-up resistor for tower output signal when fan motor is locked.

7.C1: Capacitor for fan motor lock protection and detection. If the lock protection and detection functions are not required, the LD pin should be grounded.

8.C2: Capacitor for Hall input stage noise reduction. This is unnecessary if there is no noise.

9.C3: This is unnecessary in the case of a stable input on VCC.

10.Q1/Q2: External power supply TR.

Typical Application Circuit 2 (48V)

1d1: A reverse protection diode for integrated circuits.

2.D2: The reverse protection diode of the motor coil.

3. D3/D4: Zener diodes for free rotation.

4. R1/R2: Resistors that set the DC Hall bias level.

5. R3/R4: Resistors that limit the base current of the external power supply TR.

6.R5: Pull-up resistor for taco output signal when fan motor is locked.

7. R6/R7: A resistor to set the output voltage of TR (Q3).

8.C1: Capacitor for fan motor lock protection and detection. If the lock protection and detection functions are not required, the LD pin should be grounded.

9.C2: Capacitor for Hall input stage noise reduction. This is unnecessary if there is no noise.

10.C3: No need to do this if there is a stable input on VCC.

11.Q1/Q2: External power supply TR.

12.Q3: The external power supply TR that controls the output voltage.