LB1860 Просмотр технического описания (PDF) - ON Semiconductor

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LB1860

Two-Phase Half-Wave Variable Speed Fan Motor Driver

ON Semiconductor 

LB1860, LB1860M, LB1861, LB1861M

Thermistor-controlled Application Circuit Example

Noise elimination

capacitor

Use of a thermistor enables motor speed to

be sensitive to the operating ambient

temperature.

The Rt pin voltage at Ta = 20 °C has

1.42 ms of ‘toff’ as calculated in expression

4 with the application constant of Figure 2.

However, the Rt pin voltage at Ta = 40 °C

is reduced into less than the Vct (= 1.3 V)

level, which results in a 0 of ‘toff’. This

means the 100% duty.

t = –C2  R21n

(VIN – VRt)

VIN – VCt

............. 4

Figure 2

Output Timing Chart

( ): MFP14S

Unit (resistance: , capacitance: F)

Hall input

Discharge pulse

Ct voltage

Output ‘off’ signal

OUT1 current

OUT2 current

All-phase ON waveform

Control output waveform

Figure 3

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