lb11610p Sanyo Semiconductor Corporation, lb11610p Datasheet - Page 13

• Manufacturer Part Number: lb11610p
• Description: Three-phase Brushless Motor Driver
• Manufacturer: Sanyo Semiconductor Corporation

(6) FG Output
(7) One-shot multivibrator circuit block (CEG pin, RC pin, and FV pin)
(8) Power Supply Stabilization
An inverted Hall sensor signal formed from the UIN± pins Hall sensor amplifier input signal is output from the FG pin.
The FG pin is an open-collector output.
Hall sensor amplifier input conditions: UIN- = fixed potential, FG pin: Pulled up to V CC with a resistor.
The LB11610P includes a one-shot multivibrator circuit to support speed feedback control.
The CEG pin is provide to set the rotation detection pulse signal time.
The rotation detection pulse signal is detected with the timing of the falling edge (high to low) of the FG signal.
This rotation pulse detection signal time is set by the discharge time of the capacitor connected to the CEG pin.
The RC pin sets the pulse width (high period) generated at the FG pin for each CEG pin signal.
The pulse width is set by the resistor and capacitor connected between the RC pin and the V CC pin and between the RC
pin and ground, respectively.
The pulse width TRC can be approximated with the following formula.
If the FG output frequency at the highest motor speed is fFG (Hz), then TRC is set up so that the following relationship
holds.
In this case, the FV voltage will range from 0V to about 5V according to the motor speed.
If the FV output is not used, connect the RC pin to ground and leave the FV pin open.
Capacitors adequately large for power supply stabilization must be connected between the VS pin and ground and
between the V CC pin and ground. The power supply lines will be particularly susceptible to fluctuations if diodes are
inserted in the power supply lines to prevent destruction of the IC on reverse connection of the power supply. In this
case, even larger capacitors must be used.
When the power supply is turned on or off with a switch, if the power supply switch and these capacitors are separated
by a significant distance, the power supply can be disrupted significantly by the inrush current to the line inductance
and these capacitors. The voltage handling capacity of the IC may be exceeded if this occurs. To prevent this problem
do not use ceramic capacitors that have a low series impedance, but rather use electrolytic capacitors to suppress this
inrush current and prevent voltage increases.
FG pin
UIN+ input
Rotation pulse signal detection time: Tps=Ce×VBE/Iceg(s)
TRC ≤ 1 ÷ fFG(s)
Ce: The CEG pin external capacitor (connected between V CC and the CEG pin)
VBE: CEG edge detection circuit block transistor VBE: 0.7V (typical)
Iceg: The CEG pin discharge current: 50µA (typical)
TRC ≈ 1.1 × R × C(s)
LB11610P
CR pin
To the V CC pin
UIN-
No.A0345-13/18
R
C