BD6964FVM-TR Datasheet BD6964FVM-TR | P4-P6

Datasheet

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2014 Rev.002

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BD6964FVM

Block Diagram, Application Circuit, and Pin Assignment

Pin No. Pin Name Function

1

OUT2 Motor output

2

VCC Power supply

3

H+ Hall input +

4

H- Hall input -

5

AL Lock alarm signal output

6

PWM PWM signal input

7

OUT1 Motor output

8

GND GND

M

HALL

OSC : Internal reference oscillation circuit

TSD : Thermal shutdown(head rejection circuit)

Take a measure against Vcc

voltage rise due to reverse

connection of power supply

and back electromotive force.

Incorporates soft switching

function. Adjust at an optimum

value because gradient of

switching of output waveform

depends on hall element

output.

1k

Ω

to 5kΩ

Speed control by PWM input is

enabled. Input frequency must

be 50kHz at the maximum.

This is an open drain output.

Connect a pull-up resistor.

VCC

H+

H

-

OUT2

90kΩ

2.8V

10kΩ

1

2

3

4

8

7

6

5

OSC

Lock

Protection

Control

OUT1

PWM

AL

GND

+

-

+

-

+

TSD

P.8

P.5

P.6

P.9

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BD6964FVM

Description of Operations

1) Lock Protection and Automatic Restart Circuit

Motor rotation is detected by hall signal, and lock detection ON time (t

ON

) and lock detection OFF time (t

OFF

) are set

by IC internal counter. External part (C or R) is not required. Timing chart is shown in Figure 13.

Figure 13. Lock Protection Timing Chart

2) Soft Switching (silent drive setting)

Input signal to hall amplifier is amplified to produce an output signal.

When the hall element output signal is small, the gradient of switching of output waveform is gentle; When it is large,

the gradient of switching of output waveform is steep. Enter an appropriate hall element output to IC where output

waveform swings sufficiently.

Figure 14. Relation between Hall Element Output Amplitude and Output Waveform

3) Hall Input Setting

Hall input voltage range is shown in operating conditions.

Figure 15. Hall Input Voltage Range

Adjust the value of hall element bias resistor R1 in Figure 16 so that the input voltage of a hall amplifier is input in

"Hall Input Voltage Range" including signal amplitude.

(H+)-(H-)

OUT1

Hall input voltage range

upper limit

Vcc

GND

Hall input voltage range

lower limit

H+

t

OFF

t

ON

Idling

Output Tr OFF

ON

Motor

locking

Lock

detection

Lock

release

Recovers

normal

operation

OUT2

AL

Hi(open collector)

OUT1

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BD6964FVM

○Reducing the Noise of Hall Signal

Hall element may be affected by Vcc noise depending on the wiring pattern of board. In this case, place a

capacitor like C1 in Figure 16. In addition, when wiring from the hall element output to IC hall input is long, noise

may be loaded on wiring. In this case, place a capacitor like C2 in Figure 16.

Figure 16. Application near of Hall Signal

4) PWM Input

Rotation speed of motor can be changed by controlling ON/OFF of the upper output depending on duty of the signal

input to PWM terminal.

Figure 17. Timing Chart in PWM Control

When the voltage input to PWM terminal applies H logic : normal operation

L logic : H side output is off

When PWM terminal is open, H logic is applied. PWM terminal has hysteresis of 100mV (Typ.).

*If H logic is applied to PWM terminal before VCC voltage is applied to IC, current flows to VCC terminal through ESD

protection diode inside PWM terminal, resulting in malfunction may possibly occur.

When VCC voltage is not apply to IC, do not apply voltage to PWM terminal.

5) Quick Start, Stand-by Function

The function can start motor at once regardless of the detection time of lock protection function when the PWM signal

is input. Lock protection function is turned off when the time of PWM = L has elapsed more than 66.5 ms in order to

disable lock protection function when the motor is stopped by PWM signal.

When H level duty of PWM input signal is close to 0%, lock protection function does not work at an input frequency

slower than 15Hz, therefore enter a frequency faster than 20Hz.

H+

PWM

OUT1

OUT2

Bias Current

= Vcc / (R1 + RH)

C2

Hall element

H-

H+

VCC

R1

RH

C1

BD6964FVM-TR

BD6964FVM-TR

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