BD8203EFV データシートの表示（PDF） - ROHM Semiconductor

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BD8203EFV

5ch System Motor Driver

ROHM Semiconductor 

BD8203EFV

 Noise Measures

The cause of PWM driver's noise is the following.

A. Noise from VCC and GND line

B. Radiation noise

Measures of A

① Because a high current is generated by the PWM, Lower wiring impedance at driver's power supply

(PVCC) and GND line (PGND) is recommended. This can be achieved by separating the power supply

line of other devices from the main supply to eliminate the common impedance, and connecting it to

another line.

② Use electrolytic capacitor with low ESR to power supply pin (PVCC1, PVCC2, PREVCC) of drivers and

GND pin (PGND) to make it stable. Please connect the ceramic capacitor with a high frequency

characteristic directly to the pin (or as close as possible to the IC).

PVCC1

PGND

PVCC2

Please separate as

much as possible in

the root of the power

supply.

47µF

47µF

IC except Driver

0.1µF

0.1µF

Driver IC

(BD8203EFV)

③ There is a method of inserting LC filter in the power supply line or GND line, when the first two measures

are not sufficient to solve the noise problem.

(Example)

VVCcCc

GND

120µH

47µF

0.1µF

PWM

DRIVER

IC

VVCcCc

GND

VVCcCc

GND

47µF

120µH

120µH

47µF

120µH

0.1µF

0.1µF

PWM

DRIVER

IC

PWM

DRIVER

IC

Figure 1. LC Filter Chart

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TSZ22111・15・001

11/22

TSZ02201-0H5H0BK01520-1-2

04.Nov.2015 Rev.001

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