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NJW4302

THREE-PHASE DC BRUSHLESS MOTOR CONTROL IC

Japan Radio Corporation  

NJW4302

Preliminary

s APPLICATION NOTE

•FG Amplifier

FG Amplifier consists of input differential amplifier and output Schmitt-trigger comparator. Input amplifier is

constructed as low-pass filter with external resistors and capacitors to reduce noise. The amplifier output level

should be over 250mVp-p to adjust gain by external resistors, due to hysteresis of Schmitt-trigger comparator.

FG+ input is biased internally to the half level of Vcc. This DC bias voltage is also used to RESET the internal logic

circuit. For stable RESET operation, It a capacitor, requires a 0.1 uF capacitor connected to FG+ terminal. RESET is

enable a during 0V to 1.25V of the voltage at the FG+.

FG Sensor Amplifier Application Circuit

1000p

100k

0.47u 2k

FG-

FGO

FG+

0.1u

for Internal logic

FGS

NJW4302

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