NJW4302FA1 NJR, NJW4302FA1 Datasheet - Page 5

• Manufacturer Part Number: NJW4302FA1
• Description: Motor / Motion / Ignition Controllers & Drivers 3-Input Video Switch
• Manufacturer: NJR
• Type: 3 Phase Brushless DC Motor Controllerr

Specifications of NJW4302FA1

• Supply Current: 55 mA
• Package / Case: QRF-44-A1
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

7. Brake Switch
8. VREG pin/VSH pin
9. Frequency Generator (FG) Amplifier
10. Integration Amplifier
11. Speed Control Circuit
time, all lower side transistors are turned off.
is designed with a single power supply. The VREG pin and V+ pin compose a shunt regulator for 5V±5%
application. Circuit for noise rejection. The output voltage of the amplifier must be at least 250mA p-p since it feature
Schmitt comparator.
stabilization and initial reset pulse generation for the internal logic. The reset pulse is generated when the
FGIN+ pin goes from 0 to approximately 1.25V.
comparison circuit. The FG pulse frequency is controlled to be the same frequency with a clock frequency input to the CLK
pin. Therefore, the motor speed can be controlled by changing the clock frequency.
clock frequency is 156H
output with a external resistor and a transistor. To use the regulator, the VSH pin must be either “H”, or Open.
Otherwise, the VSH pin must be “L” and the VREG pin is to be opened.
time, it also sets the control loop gain and frequency characteristics using external components.
The internal FG amplifier with few passive components composes a filter amplifier shown in the
NJW4302 uses a short brake method that turns on all phase of upper side transistors for braking. During the
NJW4302 includes a regulator to generate for +5V regulated IC supply when the motor drive circuit
The capacitor connected between the FGIN+ pin and the ground is necessary for bias voltage
The integration amplifier integrates the D-out and P-out and converts them to speed command voltage. During the
NJW4302 features two speed control method; speed discriminator
The motor speed (N) can be expressed as:
Given that the oscillation frequency range is 160kHz~1.0MH
N=CLK (Hz)×(60/FGP)[RPM] ( FGP: Number of FG pulse per one rotation)
Z
~960H
Z ,
and therefore the motor speed can be changed from 260rpm to 1600rpm.
Z
and the number of counts is 1024,the range of
circuit with PLL circuit and phase
NJW4302
- 5 -