TA84005F データシートの表示（PDF） - Toshiba

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TA84005F

Three-Phase Wave Motor Driver IC

Toshiba 

TA84005F/FG

Equivalent Circuit

<Overcurrent detector (RF, VISD, ISD) >

• Input to the VISD1 pin the voltage generated at the overcurrent detection resistor RF connected to the

RF pin.

• At chopping ON, voltage spikes at the RF pin as a result of the Pch-MOS output capacitance. To cancel

the spike, externally connect a capacitor to the VISD2 pin (10 kΩ resistor built-in).

• If the VISD2 pin voltage exceeds the internal reference voltage (VRF = 0.5 V), the overcurrent detection

output ISD pin goes High.

Inputting the ISD pin output to the TB6537P/PG/F/FG or TB6548F/FG OC pin limits the PWM ON time

and the current at the ISD output rising edge.

VCC

VISD1 10 kΩ VISD2

External

ISD

capacitor

<Pin voltage detector (COMP) >

• The pin voltage detector outputs the result of OR-ing the output pin voltages and the virtual mid-point N

voltage to determine the majority.

(If at least two phases of the three-phase output are greater than the mid-point potential, the detector

outputs “Low”. Conversely, if at least two phases are smaller than the mid-point potential, the circuit

outputs “High”.)

VCC

Majority-determining

OR data

COMP

GND

• With the virtual mid-point potential VN used as the reference for the pin voltage detection circuit

considered as half the voltage applied to the motor, then

VN = [ (VM − Ron (upper) *IO) − (Vsat (lower) + VRF) ]/2 + Vsat + VRF

= [VM − VRF + Vsat (lower) − Ron (upper) *IO]/2 + VRF.

Here, assuming that Vsat (lower) − Ron (upper) *IO ∼− VF,

we have set the following: VN = [VM − VRF + VF]/2 + VRF

<Overheating protector>

• Automatic restoration

• Temperature hysteresis supported

TSD (ON) = 180°C

TSD (HYS) = 30°C

TSD (OFF) = 150°C

9

2004-08-10

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