TB6548F/FG
TOSHIBA CMOS Integrated Circuit Silicon Monolithic
TB6548F/FG
Three-Phase Full-Wave PWM Sensorless Controller for Brushless DC Motors
The TB6548F/FG is a three-phase full-wave sensorless controller
for brushless DC motors. The device supports voltage control by
PWM signal input and is capable of PWM type sensorless driving
when used in conjunction with the TA84005F/FG.
Features
•
•
•
•
•
•
•
Three-phase full-wave sensorless drive
PWM control (PWM signal is supplied from external sources)
Turn-on signal output current: 20 mA
Built-in protection against overcurrent
Forward/reverse modes
Built-in lead angle control function (0, 7.5, 15 and 30 degrees)
Built-in lap turn-on function
Weight: 0.32 g (typ.)
TB6548FG:
The TB6548FG is a Pb-free product.
The following conditions apply to solderability:
*Solderability
1. Use of Sn-63Pb solder bath
*solder bath temperature = 230ºC
*dipping time = 5 seconds
*number of times = once
*use of R-type flux
2. Use of Sn-3.0Ag-0.5Cu solder bath
*solder bath temperature=245ºC
*dipping time = 5 seconds
*number of times = once
*use of R-type flux
Company Headquarters
3 Northway Lane North
Latham,
New York
12110
Toll Free: 800.984.5337
Fax:
518.785.4725
Web: www.marktechopto.com | Email: info@marktechopto.com
California Sales Office:
950 South Coast Drive, Suite 265
Costa Mesa, California 92626
Toll Free: 800.984.5337
Fax: 714.850.9314
TB6548F/FG
Block Diagram
V
DD
13
FG_OUT
6
14 OUT_UP
PWM 3
PWM Control
17 OUT_VP
SEL_LAP 8
Rotation
Instruction
Circuit
Timing
Control
Turn-on Signal
Forming Circuit
21 OUT_WP
15 OUT_UN
19 OUT_VN
22 OUT_WN
LA0 1
LA1 2
Lead Angle
Setting Circuit
CW_CCW 4
Overcurrent
Protection
Circuit
23 OC
Clock
Generator
Circuit
Position
Detection
Circuit
12
GND
24 WAVE
10
X
T
11
X
Tin
Pin Assignment
LA0
LA1
PWM
CW_CCW
NC
FG_OUT
NC
SEL_LAP
NC
X
T
X
Tin
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
WAVE
OC
OUT_WN
OUT_WP
NC
OUT_VN
NC
OUT_VP
NC
OUT_UN
OUT_UP
V
DD
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2004-08-09
TB6548F/FG
Pin Description
Pin No.
Symbol
I/O
Lead angle setting signal input pin
1
LA0
I
•
•
•
2
LA1
I
•
•
•
3
PWM
I
•
•
LA0
=
Low, LA1
=
Low: Lead angle of 0 degrees
LA0
=
High, LA1
=
Low: Lead angle of 7.5 degrees
LA0
=
Low, LA1
=
High: Lead angle of 15 degrees
LA0
=
High, LA1
=
High: Lead angle of 30 degrees
Built-in pull-down resistor
Description
PWM signal input pin
Inputs Low-active PWM signal
Built-in pull-up resistor
Disables input of duty-100% (Low) signal
High for 250 ns or longer is required.
High: Reverse (U
→
W
→
V)
Low, Open: Forward (U
→
V
→
W)
Built-in pull-down resistor
Rotational direction signal input pin
4
CW_CCW
I
•
•
•
5
6
7
NC
FG_OUT
NC
⎯
O
⎯
Not connected
Rotational frequency detection signal output pin
•
Equivalent to U-phase signal (except PWM)
Not connected
Lap turn-on select pin
8
SEL_LAP
I
•
•
•
Low: Lap turn-on
High: 120 degrees turn-on
Built-in pull-up resistor
9
10
11
12
13
NC
X
T
X
Tin
GND
V
DD
⎯
⎯
⎯
⎯
⎯
Not connected
Resonator connecting pin
•
Selects starting commutation frequency.
17
Starting commutation frequency f
st
=
Resonator frequency f
xt
/(6
×
2 )
Connected to GND.
Connected to 5 V power supply.
U-phase upper turn-on signal output pin
14
OUT_UP
O
•
•
•
•
U-phase winding wire positive ON/OFF switching pin
ON: Low, OFF: High
U-phase lower turn-on signal output pin
15
OUT_UN
O
⎯
U-phase winding wire negative ON/OFF switching pin
ON: High, OFF: Low
16
NC
Not connected
V-phase upper turn-on signal output pin
17
OUT_VP
O
⎯
•
•
V-phase winding wire positive ON/OFF switching pin
ON: Low, OFF: High
18
NC
Not connected
V-phase lower turn-on signal output pin
19
OUT_VN
O
⎯
•
•
V-phase winding wire negative ON/OFF switching pin
ON: High, OFF: Low
20
NC
Not connected
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2004-08-09
TB6548F/FG
Pin No.
Symbol
I/O
Description
W-phase upper turn-on signal output pin
21
OUT_WP
O
•
•
•
•
•
•
•
•
W-phase winding wire positive ON/OFF switching pin
ON: Low, OFF: High
W-phase lower turn-on signal output pin
22
OUT_WN
O
W-phase winding wire negative ON/OFF switching pin
ON: High, OFF: Low
Overcurrent signal input pin
23
OC
I
High on this pin can put constraints on the turn-on signal performing PWM control.
Built-in pull-up resistor
Positional signal input pin
24
WAVE
I
Inputs majority logic synthesis signal of three-phase pin voltage.
Built-in pull-up resistor
Functional Description
1. Sensorless Drive
On receipt of the start instruction by PWM signal, the turn-in signal for forcible commutation
(commutation irrespective of the rotor position of the motor) is output and the motor starts to rotate. The
rotation of the motor causes induced voltage on the wirewound pin for each phase.
When signals indicating positive or negative for pin voltage (including induced voltage) for each phase
are input through their respective positional signal input pins, the turn-on signal for forcible commutation
is automatically switched to the turn-on signal for the positional signal (induced voltage).
Thereafter, the turn-on signal is formed according to the induced voltage contained in the pin voltage so
as to drive the brushless DC motor.
2. Starting Commutation Frequency
(resonator pin and counter bit select pin)
The forcible commutation frequency at the time of start is determined by the resonator’s frequency and
the number of counter bits (within the IC).
+
Starting commutation frequency f
st
=
Resonator frequency f
xt
/(6
×
2
(bit 3)
)
bits
=
14
The forcible commutation frequency at the time of start can be adjusted using the inertia of the motor
and the load.
•
The forcible commutation frequency should be set higher as the number of magnetic poles increases.
•
The forcible commutation frequency should be set lower as the inertia of the load increases.
3. PWM Control
The PWM signal can be reflected in the turn-on signal by supplying the PWM signal from external
sources.
The frequency of the PWM signal should be set adequately high with regard to the electrical frequency of
the motor and in accordance with the switching characteristics of the drive circuit.
Because positional detection is performed in synchronization with the falling edges of the PWM signal,
positional detection cannot be performed with 0% duty or 100% duty.
Duty (max)
250 ns
Duty (min)
250 ns
Even if the duty is 99%, the duty of the voltage applied to the motor is 100% owing to the storage time of
the drive circuit.
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TB6548F/FG
4. PWM Control
Upper turn-on
signal (OUT-P)
Lower turn-on
signal (OUT-N)
Output voltage of
the TA84005F/FG
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2004-08-09
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