NJU7356 New Japan Radio Co.,Ltd, NJU7356 Datasheet - Page 7

• Manufacturer Part Number: NJU7356
• Description: Nju7356 Single-phase Dc Brushless Motor Driver Ic
• Manufacturer: New Japan Radio Co.,Ltd

2) Hall bias used application circuit
[Design Notes]
components:
1. Selection of C1 and D1:
2. Position Detection Circuit Hall Device
Above application example is designed for 5V operation with motor current of 400mA. It uses the following
Hall elements: HW101A (AKE)
Optimize the value in actual operating conditions if necessary. D1 is a diode for protection against reverse voltage
supply. Silicon rectifier diode (WO3C, 10D1 and equivalent) is appropriate.
2-1. When using V
C1 is used for a noise reduction purpose. A typical value is 0.1uF.
Hall amplifier is a differential amplifier.
The common-mode input voltage is between 0.4V and VDD-1V and the input signal must be within the range.
Non-excitation hall bias voltage is to be set at a half of VDD for effective use of common-mode input voltage range.
Therefore the same value of hall bias resistors is selected for R1 and R2.
Given that the bias current is set to be 5mA by HW101A datasheet, R1 and R2 can be determined as follows:
R
R
1
1
R
R
2
2
GND
V+
Rin
300
DD
(R1 and R2)
D1
Ihbias
VDD
element
C1
Hall
5
R3
10
5
3
1
0 .
k
HB
IN+
IN-
NJU7356
VDD
OUTA
OUTB
FG
FG
R
L
NJU7356
Motor
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