Continued from preceding page
Pin number Pin name Pin voltage
18
PGOUT
LB1981V
Equivalent circuit
VCC1
30µA
30kΩ
18
Pin function
FG amplifier output pin.
19
OSC
5µA
2.5µA
1kΩ
10µA
A10867
VCC1
Pin for connecting triangular
wave oscillator capacitor.
Serves for forced startup
waveform generation.
20
FC1
22
FC2
21
FILTER
19
VCC1
2kΩ
2kΩ
2s
5kΩ
10kΩ
10kΩ
A10868
20
A10869
VCC1
22
FC2
VCC1
A10870
25µA
30kΩ
1kΩ
1kΩ
1kΩ
1kΩ
29
1
2
21
A10871
Frequency characteristics pin.
Connecting a capacitor
between this pin and ground
serves to prevent closed-loop
oscillation in the current
control circuitry.
(Lower-side output transistor
drive current)
Frequency characteristics pin.
Connecting a capacitor
between this pin and ground
serves to prevent closed-loop
oscillation in the current
control circuitry.
(Lower-side output transistor
drive current)
Connecting a capacitor
between this pin and ground
activates the coil output
saturation prevention function.
In this condition, the VS pin is
controlled for motor voltage
control.
By adjusting the external
capacitor, torque ripple
compensation can be varied.
Continued on next page
No. 5917-6/9