FAN8463 查看數據表（PDF） - Fairchild Semiconductor

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FAN8463

BTL Single Phase Full Wave BLDC Motor Driver

Fairchild Semiconductor 

Application Information

1. BTL Single phase motor driver(OUT1, OUT2)

Using a BTL to drive a single-phase BLDC motor provides several advantages for dc fans over a H-bridge drive. A BTL drive has lin-

ear switching characteristics; hence, the BTL topology reduce commutation switching noise.

2. Locked Rotor Protection and Automatic Restart

When the rotor is locked, there is no change in input signal of hall amplifier and thus a internal TZERO pulse is not observed. A capac-

itor(CLD) connected LD pin is continually charged by internal current source(ILDC) to internal threshold (VLDCL) resulting from no

Tzero pulse. When the voltage,VCLD on LD pin, reaches VLDCL, the speed information output (FG, 1/2FG) becomes floating high or

low. When the VCLD reaches upper threshold, VLDCL, VCLD starts to decrease with internal current sink(ILDD) to the low threshold,

VLDCP. At that time, the VCLD ramps up again and one of two outputs is turned on depending on locked rotor position during TON.The

charging and discharging repeat until locked condition is removed, or FAN8463 is powered down. The overall time chart is shown in

figure.1. The auto- retry time(TON), the motor protection time(TOFF), the locked rotor detection time(TLOCK) are proportional to exter-

nal capacitor, CLD and each value can be calculated as follows;

TON = C-----L----D------×-----(--V-----L---I-D-L----CD-----LC-----–----V-----L----D-----C-----P----)

TOFF = C-----L----D------×-----(--V-----L---I-D-L----CD-----LD-----–----V-----L----D-----C-----P----)

TLOCK

≅

C---L---D----×-----V---L---D---C---L-

ILDC

For example, CLD = 0.33uF, then TON =0.09Sec,TOFF=0.6Sec,TLOCK =0.18Sec.

FAN8463 Rev.1.0.0

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