LB11946(2004) データシートの表示（PDF） - SANYO -> Panasonic

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LB11946
(Rev.:2004)

PWM Current Control Stepping Motor Driver

SANYO -> Panasonic 

LB11946

Switching Off Time and Noise Canceller Time Calculations

Notes on the CR Pin Setting (switching off time and noise canceller time)

The noise canceller time (Tn) and the switching off time (Toff) are set using the following formulas.

• When VCC is 5 V

Noise canceller time (Tn)

Tn ≈ C⋅R⋅ln{(1.5-RI)/(4.0-RI)}[s]

CR pin charge current: 1.25 mA

Switching off time (Toff)

Toff ≈ −C⋅R⋅ln (1.5/4.8)[s]

Component value ranges

R: 5.6 kΩ to 100 kΩ

C: 470 pF to 2000 pF

• When VCC is 3.3 V

Noise canceller time (Tn)

Tn≈C⋅R⋅ln {(1.06-RI)/(2.66-RI)}[s]

CR pin charge current: 0.7 mA

Switching off time (Toff)

Toff ≈ −C⋅R⋅ln (1.06/3.1)[s]

VCC line

One-shot mult-

vibrator blanking time

circuit

CR pin

E1

C: 680pF

R: 30 kΩ

CR Pin Internal Circuit Structure

Notes on the MD Pin

• If slow decay mode is set up by setting the D4 and D10 bits in the input serial data to 1, the MD pin must be shorted to

ground.

• If fast decay mode is set up by setting the D4 and D10 bits in the input serial data to 0, mixed decay mode can be set

with the MD pin.

When the VCC = 5 V specifications are used the setting voltage range for mixed decay mode is 1.6 to 3.9 V.

When the VCC = 3.3 V specifications are used the setting voltage range for mixed decay mode is 1.2 to 2.5 V.

If mixed decay mode will not be used with the fast decay mode setting, either:

(a) Short the MD pin to ground to select fast decay mode, or

(b) Short the MD pin to VCC to select slow decay mode.

No.7946-11/12

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