FAN8040

10

• 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.

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 time constant is

•

Input

0V

0V

5V

FWD

REV

1V/usec

0V

V

REF

OUTF

OUTR

Output

Output

0V

V

REF

OUTF

OUTR

Input

0V

0V

5V

FWD

REV

)

]

[

5

.

2

:

(

],

[

5

.

2

1

1

V

input

reverse

Or

V

R

I

V

A

−

≈

×

=

sec]

[

5

.

2 u

C

R

=

×

]

[

]

[

V

V

V

V

V

V

V

V

A

REF

OUTR

A

REF

OUTF

−

=

+

=