NJW4302 New Japan Radio Co.,Ltd, NJW4302 Datasheet - Page 15

• Manufacturer Part Number: NJW4302
• Description: Three-phase Dc Brushless Motor Control Ic
• Manufacturer: New Japan Radio Co.,Ltd

FG Amplifier
APPLICATION NOTE
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.
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 Amplifier consists of input differential amplifier and output Schmitt-trigger comparator. Input amplifier is
FG+ input is biased internally to the half level of Vcc. This DC bias voltage is also used to RESET the internal logic
FG Sensor Amplifier Application Circuit
0.47u
2k
0.1u
FG-
FG+
NJW4302
1000p
100k
for Internal logic
FGO
FGS
NJW4302
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