an44070a Panasonic Corporation of North America, an44070a Datasheet - Page 18

• Manufacturer Part Number: an44070a
• Description: Driver Ic For Dc Motor
• Manufacturer: Panasonic Corporation of North America

AN44070A
11. A high current flows into the IC. Therefore, the common impedance of the PCB pattern cannot be ignored. Take the following
12. In the case of measuring the chip temperature of the IC, measure the voltage of TJMON(Pin1) and presume chip temperature from
Usage Notes (continued)
GND
VM
points into consideration and design the PCB pattern of the motor.
A high current flows into the line between the VM1 (Pin16) and VM2 (Pin3) pins. Therefore, noise is generated with ease at the
time of switching due to the inductance (L) of the line, which may result in the malfunctioning or destruction of the IC (see the
circuit diagram on the left-hand side). As shown in the circuit diagram on the right-hand side, the escape way of the noise is
secured by connecting a capacitor to the connector close to the VM pin of the IC. This makes it possible to suppress the direct VM
pin voltage of the IC. Make the settings as shown in the circuit diagram on the right-hand side as much as possible.
following data. Use the following data as reference data. Before applying the IC to a product, conduct a sufficient reliability test of
the IC along with the evaluation of the product with the IC incorporated.
Noise is generated with ease
C
L
VBE[V]
0
IC
The temperature characteristic of TJMON
ΔVBE / Δtemp = –1.82 [mV/°C]
Ver. AEB
GND
VM
Recommended PCB
150
L
C
Temp[°C]
IC
the VM pin and ground pin
Low spike amplitude
the capacitance
between
due to
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