參數(shù)資料
型號(hào)： TPIC43T02DAR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： BRUSHLESS DC MOTOR CONTROLLER, PDSO38
封裝： PLASTIC, TSSOP-38
文件頁(yè)數(shù)： 13/29頁(yè)
文件大?。?/td> 463K
代理商： TPIC43T02DAR
TPIC43T01, TPIC43T02
THREE-PHASE BRUSHLESS MOTOR RPM CONTROLLERS
SLIS098 – APRIL 2000
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
current limit/over-current shutdown
Referring to Figure 15, two comparators monitor the voltage drop across an external current sensing resistor,
R(SENSE).Thesensedvoltage,V(SENSE),isthencomparedagainsttwoVCC referredvoltages,VLandV(OCSD).
When V(SENSE) exceeds VL, the ILIM comparator outputs a high level. When V(SENSE) exceeds V(OCSD), the
OCSD comparator also outputs a high level. The combination of these two comparator outputs is then used in
conjunction with a deglitch or blanking timer to discriminate between a high di/dt, short-duration current spike.
This spike is commonly caused by reverse recover time (trr) current at the start of each PWM cycle and a portion
of the current waveform with lower di/dt. The lower di/dt is controlled by the L/R time constant of the motor
winding (see Figure 16). A comparator is also used to detect over current conditions caused by a shorted-load
or shorted phase-winding to GND (see Figure 17).
QD
Q CLK
CLR
_
+
_
+
V(LM)
VOCSD
OCSD
COMP
ILIM
COMP
R
2
× R
Digital
Deglitch
(0.5 – 2
s)
PWM
Control
IDET
_
+
VDD
Vref
V(thres)
Generation
ILIMIT
Block
OCSD
S/S
PWM_OFF
PWM_START
OSC
VCC
Power
Drivers
SENSE
V(sense)
R(sense)
+
A
C
B
3-Phase
Motor
Figure 15. ILIMIT/OCSD Diagram
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