TB6575FNG Toshiba, TB6575FNG Datasheet - Page 8

• Manufacturer Part Number: TB6575FNG
• Manufacturer: Toshiba

Specifications of TB6575FNG

• Function: Controller
• Vopmax (vm*): 5.0V (5.5V)
• Io (lpeak): 20mA
• Sinusoidal Current Wave: no
• Sensor-less: yes
• Speed Feedback Loop: no
• Package: SSOP24
• Rohs Compatible†: yes

8. Motor position detection error
Position sensing input
error relative to the PWM signal frequency may occur. Keep this in mind especially when the TB6575FNG
is used for a high-speed motor.
voltage exceeds the reference voltage.
Internal PWM signal
A position detection is synchronized with the PWM signal generated in the IC. Thus, a position detection
A detection is performed on the falling edge of the PWM signal. An error is recognized when the pin
(WAVE)
Detection error time < 1/f
Pin voltage
TB6575FNG
(Negative terminal of Comparator)
Reference voltage
23
WAVE
Ideal detection timing
p
Output ON
f
V
p
TA75393P
(Comparator)
: PWM frequency = f
DD
(Positive terminal of Comparator)
8
Pin voltage
V
M
100 kΩ
100 kΩ
Rf
Actual detection timing
XT
/256
motor
f
XT
: Ceramic oscillator frequency
TB6575FNG
2008-9-11