tb62201afg TOSHIBA Semiconductor CORPORATION, tb62201afg Datasheet - Page 24

• Manufacturer Part Number: tb62201afg
• Description: Dual-stepping Motor Driver Ic For Oa Equipment Using Pwm Chopper Type
• Manufacturer: TOSHIBA Semiconductor CORPORATION

CR Circuit Constants
The OSC circuit generates the chopping reference signal by charging and discharging the external capacitor Cosc
through current supplied from the external resistor Rosc in the OSC block.
Voltages E1 and E2 in the diagram are set by dividing the V
The actual current chopping time is 1/8 the CR frequency.
[Important: Setting the cr circuit constants]
The CR oscillation waveform is converted in the IC to the CLK waveform (CR-CLK signal) and used for control.
If the CR waveform discharge time is set outside the range shown below, the operation of the IC is not guaranteed.
Be sure to set the CR waveform discharge time within the following range.
OSC circuit oscillation waveform
600 ns > t (CR discharge) > 400 ns
E1
E2
t = 0
t (CR − charge)
24
DD
by approximately 3/5 (E1) and 2/5 (E2).
t = 1
t (CR − dis-charge)
t = 2
TB62201AFG
2005-04-04