FAN8040 データシートの表示（PDF） - Fairchild Semiconductor

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FAN8040

4-Channel Motor Driver

Fairchild Semiconductor 

FAN8040

• Internal primary filter is composed of sourcing/sinking current source of 25uA and forward/reverse controlled switches.

• It converts "FWD/REV" digital signals to analog signal as shown Figure. 2.

5V

FWD

Input

0V

REV 0V

1V/usec

VREF

Output

0V

OUTF

OUTR

5V

FWD

Input

0V

REV

0V

VREF

Output

0V

OUTF

OUTR

Figure 3. Operartion waveforms of BTL Driver (CH1, CH2 and CH3)

• If the forward input signal is high level (avobe 2.4V) and reverse input signal is low level (under 0.5V), then the forward

current source switch S1and reverse current source switch S2 become turn-on and turn-off, respectively.

• This causes the internal capacitor, C1, to be charged with sourcing current source of 25uA and consequently the voltage of

the filter output, VA, increases with the internal time constant of 2.5usec.

•

VA = I1 × R1 ≈ 2.5[V ], (Or reverse input : −2.5[V ] )

• The time constant is

R × C = 2.5[u sec]

Where, R is 100 [㏀] and C is 25[pF].

• The output voltages of power amplifers, VOUTF and VOUTR, are given as:

•

VOUTF = VREF + VA [V ]

VOUTR = VREF −VA [V ]

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