LB11870 Datasheet, PDF (8/14 Pages) Sanyo Semicon Device – Three-Phase Brushless Motor Driver for Polygonal Mirror Motors

LB11870
Continued from preceding page.
Pin No. Symbol
Pin Description
19
FC
Frequency characteristics correction for the
current control circuit.
Insert a capacitor (about 0.01 to 0.1μF)
between this pin and ground.
The output duty is determined by comparing
the voltage on this pin to the PWM oscillator
waveform.
VREG
Equivalent Circuit
300Ω
19
21
PD
Phase comparator output.
The phase error is converted to a pulse duty
and output from this pin.
VREG
300Ω
21
22
EI
Error amplifier input.
VREG
23
EO
Error amplifier output.
VREG
24
TOC
Torque command voltage input.
This pin is normally connected to the EO pin.
When the TOC voltage falls, the lower output
transistor on duty is increased.
VREG
300Ω
22
23
300Ω
24
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