HA13609ANT 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HA13609ANT

Three-Phase Brushless Motor Driver

Hitachi -> Renesas Electronics 

HA13609ANT

5. The PWM carrier frequency fPWM is determined by the following formula:

1

fPWM = 0.0489 C106 · R1 [Hz]

6. The relationships between the crystal oscillator frequency fOSC and the speed command clock

fCLK, the speed detection signal fMR, and the discriminator resolution (number of counts) C are

shown below.

fCLK = fMR·D1

fOSC = fCLK·1 / D2·C [Hz]

However, C must be in the range 1024 ≤ C ≤ 4095

Here, D1 : The MR signal divisor determined by D1 select

D2 : The crystal oscillator frequency divisor determined by D2 select.

Configuration of the speed control and phase control blocks when @MD9 = 0

Buffer amplifier

Speed signal

D1

fMR

SPEED CLK

fCLK

X’tal

D2

fOSC

fMR’

CLK counter

Discriminator

counter setting

Discriminator

(1024 to 4095)

Charge

pump

16

C3

R3

–+

15

R7

19

R1

4Icp

PLL

PLL SEL

Discrimi-

nator

Vp

Discriminator

output

4% pulse

14

R4 R6

PLL output

C4

13

R5

Note: If possible, Tr and Tf for the SPEED CLK signal should be under 20 ns when using this circuit.

17

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