KA3080BD datasheet(11/20 Pages) FAIRCHILD

No de pièce	KA3080BD

Description	3-Phase BLDC Motor Driver

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Fabricant	FAIRCHILD [Fairchild Semiconductor]

Site Internet	http://www.fairchildsemi.com

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11 / 20 page

KA3080/KA3080D/KA3080DM

11

Application Information (32-SDIPH:

Ο

Ο , 28-SSOPH: (#))

1. Hall Input

The input signal of the hall sensor requires larger amplitude than 100mVo-p. The operating voltage level of the hall sensor is

from 1.2V ~ VCC1-0.8V.

2. Output Current Detection

The RS (Output current sensing resistor ) is connected to GOUT and Approx. 0.5Ω, It converts motor current to a voltage

which is feedback amplifier.

3. Motor Speed Control (Input Current Limitation)

The maxmum output current is limitted by the ILIM (Current limiting) voltage.

If current limitation is not in use then connect it to VCC1.

The control gain is approx. 0.67A/V as follows.

GML =

∆IO / ∆VLIM = (IO2 − IO1) / (VLIM2 − VLIM1), where VLIM1 = 1.45V → Output current=IO1

VLIM2 = 1.55V

→ Output current=IO2

2

4

6

1

3

5

More than 1.7V

More than 100mVo-p

More than 1.3V

VCC1

(15)

(17)

(19)

(16)

(18)

(20)

16

13

14

15

11

12

(1) VCC2

(26) UOUT

(27) VOUT

(28) WOUT

RS (0.5

Ω)

(25 Pin)

(22 Pin)

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