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PDF TB6575FNG Data sheet ( Hoja de datos )
| Número de pieza | TB6575FNG | |
| Descripción | PWM Sensorless Controller | |
| Fabricantes | Toshiba Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TB6575FNG (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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Preliminary TOSHIBA CMOS Integrated Circuit Silicon Monolithic
TB6575FNG
PWM Sensorless Controller for 3-Phase Full-Wave BLDC Motors
TB6575FNG
The TB6575FNG provides sensorless commutation and PWM
current control for 3-phase full-wave BLDC motors. It controls
rotation speed by changing a PWM duty cycle by analog voltage.
Features
www.DataSheet4U.com
• 3-phase full-wave sensorless drive
• PWM chopper drive
• PWM duty cycle control by analog input
• 20-mA current sink capability on PWM output pins
• Overcurrent protection
• Forward/reverse rotation
Weight: 0.14 g (typ.)
• Lead angle control (7.5° and 15°)
• Overlap commutation
• Rotation speed sensing signal
• DC excitation mode to improve startup characteristic
• DC excitation time and forced commutation time for startup operation can be changed.
• Forced commutation frequency can be selected. (fXT/(6 × 216), fXT/(6 × 217), fXT/(6 × 218) )
• Output polarity switching (P-channel + N-channel, N-channel + N-channel)
1 2004/03/15
1 page  
TB6575FNG
and forced commutation modes are determined according to the SC pin voltage. When a measurable
back-EMF is detected, the motor switches to sensorless mode. The duty cycle for sensorless mode is
determined by the VSP value.
3. Forced commutation frequency
The forced commutation frequency for startup operation is set as follows.
The optimal frequency varies depending on the motor type and motor loading. Thus, It must be adjusted
experimentally.
FST = High or Open : Forced commutation frequency fST = fXT/(6 × 216)
FST = Middle
: Forced commutation frequency fST = fXT/(6 × 217)
FST = Low
: Forced commutation frequency fST = fXT/(6 × 218)
* fXT: Crystal oscillator frequency
www.DataSheet4U.c4o.m PWM frequency
The PWM frequency is determined by an external oscillator.
PWM frequency (fPWM) = fXT/256
* fXT: Crystal oscillator frequency
The PWM frequency must be sufficiently high, compared with the electrical frequency of the motor and
within the switching performance of the transistors.
OS = High or Open
PWM signal driving
high-side transistors
PWM signal driving
low-side transistors
Motor pin voltage
5. Speed control VSP pin
An analog voltage applied to the VSP pin is converted by the 6-bit AD converter to control the duty cycle
of the PWM.
0 ≤ VDUTY ≤ VAD (L)
→ Duty cycle = 0%
VAD (L) ≤ VDUTY ≤ VAD (H)
→ Figure at the right (1/64 to 63/64)
VAD (H) ≤ VDUTY ≤ VDD
→ Duty cycle = 100% (63/64)
Duty cycle
100%
0%
VAD (L)
1 V (typ.)
VAD (H)
4 V (typ.)
VSP
5 2004/03/15
5 Page 
Application Circuit Example
Speed command
(analog voltage) VSP
5
SC
2
START
8
IP
VDD
9
2 FST
24
Startup time
setting
6-bit AD
converter
1-phase excitation
control circuit
Startup commutation
frequency setting
FMAX
5
Maximum commutation
frequency setting
VDD
LA
12
Lead angle setting
CW_CCW
6
SEL_LAP
20
Duty
19
PWM
control
Clock
generation
XTout XTin
10 11
5V
21
VDD
Timing
setting
MCU
24 7
OS FG_OUT
PWM
generator
OUT_UP
13
OUT_VP
15
OUT_WP
17
OUT_UN
14
OUT_VN
16
OUT_WN
18
Overcurrent
protection
OC
22
GND
1
Position
recognition
WAVE
23
4-MHz crystal oscillator
TB6575FNG
VM
M
(*1)
1 kΩ
TA75393P
Note 1: Because there may be short circuits between outputs, to supply, or to ground, be careful when designing output lines, VDD lines, and ground lines.
Note 2: The above application circuit including component values is reference only. Because the values may vary depending on the motor type, the optimal values must be
determined experimentally.
*1: Connect a resistor, if necessary, to prevent malfunction due to noise.
11 2004/03/15
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet TB6575FNG.PDF ] | |
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