NJW4302 Ver la hoja de datos (PDF) - Japan Radio Corporation

Número de pieza

componentes Descripción

Fabricante

NJW4302

THREE-PHASE DC BRUSHLESS MOTOR CONTROL IC

Japan Radio Corporation  

NJW4302

Preliminary

• FG interfac for logic output device

The circuit below is a FG interface for logic output device (i.e. Hall IC and optical encoder). Two external

resistors are required to adjust the input voltage within the common mode input voltage range,0 to Vcc-1.5V.

FG interface for logic level input

5V

1.5k

logic

FG -

FG +

3.5k

0.1u

FGO

FG

for Internal logic

NJW4302

• Power supply generating from Vref

To supply for NJM4302, Hall sensor and Power stage, QR1 should have 100mA current capacity. It needs 47

microfarad capacitor on V+ of NJW4302 for ripple filtering.

• Hall sensor biasing

Hall biasing is determined by Hall signal amplitude. Hall signal amplitude must be larger than input sensitivity

of NJW4302.

• FG Input

Internal FG Amplifier is a differential amplifier which inputs and output are pin-outed. The DC gain of this

amplifier, AFG, is:

AFG

=

R7

R8

C8 is for noise reduction, C9 is for DC cut. Typical value of C10 is 0.1 microfarad. The inductor symbol

connected FGIN is FG sensing copper pattern on PC board.

• Power supply generating from Vref

To supply for NJM4302, Hall sensor and Power stage, QR1 should have 100mA current capacity. It needs 47

microfarad capacitor on V+ of NJW4302 for ripple filtering.

• Hall sensor biasing

Hall biasing is determined by Hall signal amplitude. Hall signal amplitude must be larger than input sensitivity

of NJW4302.

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