參數(shù)資料
型號(hào): FAN8463MTCX
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類(lèi): 運(yùn)動(dòng)控制電子
英文描述: BTL Single Phase Full Wave BLDC Motor Driver
中文描述: BRUSHLESS DC MOTOR CONTROLLER, 0.5 A, PDSO14
封裝: TSSOP-14
文件頁(yè)數(shù): 7/14頁(yè)
文件大?。?/td> 316K
代理商: FAN8463MTCX
7
www.fairchildsemi.com
FAN8463 Rev.
1.0.0
F
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 T
ZERO
pulse is not observed. A capac-
itor(C
LD
) connected LD pin is continually charged by internal current source(I
LDC
) to internal threshold (V
LDCL
) resulting from no
Tzero pulse. When the voltage,V
CLD on
LD pin, reaches V
LDCL
, the speed information output (FG, 1/2FG) becomes floating high or
low. When the V
CLD
reaches upper threshold, V
LDCL
, V
CLD
starts to decrease with internal current sink(I
LDD
) to the low threshold,
VLDCP. At that time, the V
CLD
ramps up again and one of two outputs is turned on depending on locked rotor position during T
ON
.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(T
ON
), the motor protection time(T
OFF
), the locked rotor detection time(T
LOCK
) are proportional to exter-
nal capacitor, C
LD
and each value can be calculated as follows;
For example, C
LD
= 0.33uF, then T
ON
=0.09Sec,T
OFF
=0.6Sec,T
LOCK
=0.18Sec.
TON
CLD
--------------------------------------------------------------------------
VLDCL
ILDC
(
)
×
=
TOFF
CLD
--------------------------------------------------------------------------
VLDCL
ILDD
(
)
×
=
T
LOCK
----------------------------
×
LDC
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