NJW4302 New Japan Radio Co.,Ltd, NJW4302 Datasheet - Page 16

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

NJW4302
FG interfac for logic output device
Power supply generating from Vref
Hall sensor biasing
FG Input
Power supply generating from Vref
Hall sensor biasing
- 16 -
FG interface for logic level input
resistors are required to adjust the input voltage within the common mode input voltage range,0 to Vcc-1.5V.
microfarad capacitor on V+ of NJW4302 for ripple filtering.
of NJW4302.
amplifier, A
connected FGIN is FG sensing copper pattern on PC board.
microfarad capacitor on V+ of NJW4302 for ripple filtering.
of NJW4302.
The circuit below is a FG interface for logic output device (i.e. Hall IC and optical encoder). Two external
To supply for NJM4302, Hall sensor and Power stage, QR1 should have 100mA current capacity. It needs 47
Hall biasing is determined by Hall signal amplitude. Hall signal amplitude must be larger than input sensitivity
Internal FG Amplifier is a differential amplifier which inputs and output are pin-outed. The DC gain of this
C8 is for noise reduction, C9 is for DC cut. Typical value of C10 is 0.1 microfarad.
To supply for NJM4302, Hall sensor and Power stage, QR1 should have 100mA current capacity. It needs 47
Hall biasing is determined by Hall signal amplitude. Hall signal amplitude must be larger than input sensitivity
FG
, is:
logic
A
FG
R
R
7
8
1.5k
3.5k
5 V
0.1u
FG +
FG -
NJW4302
for Internal logic
FGO
FG
The inductor symbol