KA8328 查看數據表（PDF） - Fairchild Semiconductor

零件编号

产品描述 (功能)

生产厂家

KA8328

2-PHASE DRUM MOTOR DRIVER

Fairchild Semiconductor 

VCR PRODUCTS

KA8328D

5.The constant voltage source (VREG) has the function of keeping the output voltage always constant, with having

the VCC voltage as its input, as in the following diagram. VREG always keeps constant voltage even though the

VCC or internal temperature changes because the band-gap referenced biasing circuit is used as the reference

voltage source of the constant voltage source. VREG becomes the supply voltage source of each internal block

and the external hall sensors.

VCC

4

Band-gap-referenced

Biasing circuit

B

VB +

AMP

−

VREG 10

Hall sensor

Each block

<Constant Voltage Source Diagram>

The following is the simplified circuit of the constant voltage source (VREG). The output voltage (VB) of the band-

gap reference biasing circuit is the reference voltage, and always maintains constant voltage.

The other input voltage (VR) changes according to the state of the output voltage. So the output voltage always

maintains constant voltage with the voltage difference of the input voltage VB and VR.

4

Band gap referenced

Biasing circuit

VB Q6

Q7

Q8

10

VREG

VR

<Constant voltage source circuit>

MIC-99D001

9

January 1999

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