NJW4302FA1 NJR, NJW4302FA1 Datasheet - Page 17

• 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

FG Input
PWM Frequency
Variable range of VCO frequency
Detecting time of rock protection
Upper power transistor
Lower power transistor
Integration Amplifier
of this amplifier, A
inductor symbol connected FGIN is FG sensing copper pattern on PC board.
Integration Amplifier. Mixing resistor, Timing resistors and capacitors are necessary for good system operation.
C6 is need for non-polar type capacitor for good stability.
Minimum output current is 12mA, it is able to drive 1A class transistor. If more current is needed, change the
output transistor to Darlington type. Re-circulating diodes is needed on between collector and emitter of output
transistor.
the output transistor to Darlington type. The resistor connected between base and emitter of power transistor is
necessary on PWM operation for sharp cut-off of power transistor. When your system have any noise, attach a
capacitor in parallel the resistor.
resistor and settled by following:
In fig.x*, t
Detecting time is settled by C2 as follow:
Internal FG Amplifier is a differential amplifier and both inputs and output are connected to the pin. The DC gain
C8 is for compensation or noise reduction, C9 is for DC cut. Typical value of C10 is 0.1 microfarad.
In fig.x*, f
VCO frequency in typical value is recommend 160kHz to 1MHz. External constants is:
If it can not be settled into this range, change the division of speed discriminator.
Both speed discriminator output and PLL output should be mixed via two resistors before input to INTIN of
To reduce ripple of power line, Upper output transistor is connect NJM4302 via common-base NPN transistors.
When VRF is sensing voltage, Io is sensing current. Take care of power dissipation of R11, also.
PWM clock generates by CR oscillator. The frequency is:
Lower output could drive external power transistor directly to about 1.5A. If more current is needed, change
Re-circulating diodes is needed on between collector and emitter of output transistor. R11 is a current sensing
R2 = 20k ohm, C3 = 100pF, R3 = 27k ohm, C4 = 0.47 uF
rock
PWM
is about 3.1 sec.
is about 19kHz.
t
R11
A
f
ROCK
FG
PWM
FG
, is:
V
R
I
R
RE
66 C
O
. 0
7
8
48
2
1
R
1
If f
C
PWM
1
is about 20kHz, it could reduce audible noise.
NJW4302
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