FAN8741 Fairchild Semiconductor, FAN8741 Datasheet - Page 15

• Manufacturer Part Number: FAN8741
• Manufacturer: Fairchild Semiconductor

FAN8741/FAN8742 Rev. 1.0.1
3. Channel 1~4 Schematic
• The reference voltage(ref) is given externally through pin21.
• The input OP-amp output signal is amplified by (20K/10K) times and then fed to the power amplifier. The gain of power amplifier is
4. Mute Inputs
FAN8741 has 2 independent mute pins: Pin #22(MUTE1) and Pin #23(MUTE2). Details are shown below.
Note:
To make the spindle short brake, MUTE2 goes low and the spindle command must not be in deadzone(±50mV). When the spindle
command is within the deadzone, the spindle block enters disable mode even though MUTE2 is low.
MUTE1
4 so the total max gain of channels 1 through 4 is 8.
H
H
L
L
Command
MUTE2
H
H
L
L
SPIN-
Disable
DLE
10k
ref
Enable
Enable
SLED
Enable
20k
Disable
CH1/2/3
Disable
15
CH4(typ. load-
ing driver)
power amp
Disable
Disable
Enable
SPINDLE brake type
Reverse brake when
SPIN
SPIN<VREF
Short brake
VREF
-
-
M
www.fairchildsemi.com
(note)