lv8829lf Sanyo Semiconductor Corporation, lv8829lf Datasheet - Page 11

• Manufacturer Part Number: lv8829lf
• Description: For Brushless Motor Drive Pwm Driver Ic
• Manufacturer: Sanyo Semiconductor Corporation

5. Hall Input Signal
A pulse input with the amplitude in excess of the hysteresis (35mV maximum) is required for the Hall inputs.
It is desirable that the amplitude of the Hall input signal be 100mVp-p or more in consideration of the effect of noise
and phase displacement.
If disturbances to the output waveform (during phase switching) occur due to noise, connect a capacitor between the
Hall input pins to prevent such disturbances. In the constraint protection circuit, the Hall input is utilized as a judgment
signal. Although the circuit ignores a certain amount of noise, caution is necessary.
If all three phases of the Hall input signal go to the same input state (HHH or LLL), the outputs are all set to the OFF
state.
If the Hall IC is used, fixing one side of the inputs (either the + or – side) at a voltage within the common-mode input
voltage range (between 0.3V and VREG-1.7V) allows the other input side to be used as an input over the 0V to VREG
range.
○ Method of connecting Hall elements
○ HB pin
Type (1) connection (three Hall elements connected in series)
Advantages
Disadvantages
Type (2) connection (three Hall elements connected in parallel)
Advantages
Disadvantages
The HB pin is used for cutting off the current flowing in the Hall elements during standby (for saving electricity).
The output from the HB pin is set to OFF in the following cases.
• Because the current flowing in Hall elements can be shared by connecting the Hall elements in series, the current
• The use of a current limiting resistor can be eliminated.
• Fluctuations of amplitude with temperature are reduced.
• Because only 1V can be applied to one Hall device, there is a possibility that adequate amplitude cannot be
• The current flowing in the Hall elements varies with temperature.
• The current flowing in the Hall elements can be determined by the current limiting resistor.
• The voltage applied to the Hall elements can be varied, enabling adequate amplitude to be obtained.
• Because it is necessary to supply current separately to each Hall element, the current consumption becomes large.
• A current limiting resistor is necessary.
• The amplitude varies with temperature.
• When the S/S pin is in a STOP state
• When 0% duty is detected at the PWMIN pin input
consumption is less than that of a parallel-connected arrangement.
obtained.
HB
(1)
V CC
3V Constant-voltage Output
LV8829LF
(2)
HB
V CC
3V Constant-voltage Output
No.A1801-11/13