STK6103 datasheet(7/11 Pages) SANYO

7 / 11 page

STK6103

No. 4290-7/11

(2)

Other functions

CW/CCW

The direction of motor revolution can be selected by setting the input level to H or L. CW is H level and

CCW is L level. The CW timing chart is indicated in Fig. 3, and the CCW timing chart in Fig. 5.

Current limiter function

The current limiter converts the GND driver transistor source current into V

RS through the external RS, and

controls GND driver transistor conduction based on a comparison of this voltage to Vref

Vref

2 generates a

0.1 V

CC2 voltage in pin open state.

Vref

2 is generated by the voltage division between 27 kΩ and 3 kΩ

resistances, and so the Vref

2 level can be readily reduced by attaching an external resistor.

To prevent HIC

destruction in the event of motor lock, a current limiter can be enabled by setting Vref

2 at or below Io ave.

no such protection is required, set Vref

2 between Io max and Io ave to limit rush current.

FG OUT

This pin outputs a square wave pulse proportional to one motor revolution, which can be used as the motor

servo-control PLL IC FG input signal. The square wave L level time t

1 is set by the time constant of CF and

F connected to the TFG pin (Fig. 4).

Fig. 4

In general, when the n-pole 3-phase brushless motor fixed-speed rpm is expressed as N(rpm), the setting for t

so that t

1 = 0.5 t2 is given by expression x.

t1 =

1000

x 0.5

[ms]···································· x

x 6 x

The relation between C

F, RF and t1 is given by expression y.

1 ≈ a·RF ·CF ································································· y

However, a = 1

(

s ), R

F = 3 kΩ to 30 kΩ, t1>50 µs

Ω·F

Expression x is designed to be half that of fixed speed t

2, but when an FV conversion circuit is connected to

the FG OUT pin, it is necessary to reduce the duty to under 50%. In this case, adjust R

F or CF as needed.

(3)

Precautions in drive

Start current (rush current)

The motor start Rs current waveform is shown in Fig. 6. Current peak I

OH must not exceed Io max.

Position detect signal

Because signal input sensitivity V

H is ±500 mV max, the level of the output signal (open collector) from the

Hall IC must be reduced through conversion. A sample of this circuit is shown in Fig. 7. The position detect

signal must be compatible with the motor phase winding even in the time chart state shown in Fig. 3, or the

motor may not revolve smoothly.

Motor phase winding current during braking

The motor phase winding current during braking must not exceed Io max even during peak, although several

times set current levels are input.

STK6103 Datasheet(PDF) 7 Page - Sanyo Semicon Device

STK6103 Datasheet(HTML) 7 Page - Sanyo Semicon Device

Html Pages

1 2 3 4 5 6 7 8 9 10 11

Datasheet Download

Link URL