TOSHIBA TB6548F_06

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-37Pb 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
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TB6548F/FG
Block Diagram
VDD
FG_OUT
13
6
14 OUT_UP
PWM 3
PWM Control
17 OUT_VP
SEL_LAP 8
CW_CCW 4
Turn-on Signal
Forming Circuit
Rotation
Instruction
Circuit
Timing
Control
21 OUT_WP
15 OUT_UN
19 OUT_VN
22 OUT_WN
LA0 1
LA1 2
Lead Angle
Setting Circuit
Overcurrent
Protection
Circuit
Clock
Generator
Circuit
Position
Detection
Circuit
10
11
12
XT
XTin
GND
23 OC
24 WAVE
Pin Assignment
LA0
1
24
WAVE
LA1
2
23
OC
PWM
3
22
OUT_WN
CW_CCW
4
21
OUT_WP
NC
5
20
NC
FG_OUT
6
19
OUT_VN
NC
7
18
NC
SEL_LAP
8
17
OUT_VP
NC
9
16
NC
XT
10
15
OUT_UN
XTin
11
14
OUT_UP
GND
12
13
VDD
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TB6548F/FG
Pin Description
Pin No.
Symbol
I/O
Description
Lead angle setting signal input pin
1
2
LA0
LA1
I
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
PWM signal input pin
3
PWM
I
•
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.
Rotational direction signal input pin
4
CW_CCW
I
5
NC
⎯
6
FG_OUT
O
7
NC
⎯
•
High: Reverse (U → W → V)
•
Low, Open: Forward (U → V → W)
•
Built-in pull-down resistor
Not connected
Rotational frequency detection signal output pin
•
Equivalent to U-phase signal (except PWM)
Not connected
Lap turn-on select pin
•
Low: Lap turn-on
•
High: 120 degrees turn-on
•
Built-in pull-up resistor
8
SEL_LAP
I
9
NC
⎯
Not connected
10
XT
⎯
Resonator connecting pin
11
XTin
⎯
12
GND
⎯
13
VDD
⎯
•
Selects starting commutation frequency.
17
Starting commutation frequency fst = Resonator frequency fxt/(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
16
NC
⎯
17
OUT_VP
O
•
U-phase winding wire negative ON/OFF switching pin
•
ON: High, OFF: Low
Not connected
V-phase upper turn-on signal output pin
18
NC
⎯
•
V-phase winding wire positive ON/OFF switching pin
•
ON: Low, OFF: High
Not connected
V-phase lower turn-on signal output pin
19
20
OUT_VN
NC
O
⎯
•
V-phase winding wire negative ON/OFF switching pin
•
ON: High, OFF: Low
Not connected
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TB6548F/FG
Pin No.
Symbol
I/O
21
OUT_WP
O
Description
W-phase upper turn-on signal output pin
•
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 fst = Resonator frequency fxt/(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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TB6548F/FG
5. Positional Variation
Since positional detection is performed in synchronization with the PWM signal, positional variation
occurs in connection with the frequency of the PWM signal. Take particular care if using the IC for
high-speed motors.
Variation is calculated by detecting at two consecutive rising edges of the PWM signal.
1/fp < Detection time variation < 2/fp
fp: PWM frequency
PWM signal
Output voltage
of the
TA84005F/FG
Reference voltage
Pin voltage
Positional signal
Ideal detection timing
Actual detection timing
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TB6548F/FG
6. Lead Angle Control
The lead angle is 0 degrees during the starting forcible commutation and, when normal commutation is
started, automatically changes to the lead angle that has been set using LA0 and LA1. However, if both
LA0 and LA1 are set for High, the lead angle is 30 degrees in the starting forcible commutation as well as
in normal commutation.
Induced voltage
Turn-on signal
(1) Lead angle: 0 degrees
U
V
W
30 degrees
OUT_UP
OUT_UN
PWM control
OUT_VP
OUT_VN
OUT_WP
OUT_WN
(2) Lead angle: 7.5 degrees
PWM control
22.5 degrees
OUT_UP
OUT_UN
PWM control
OUT_VP
OUT_VN
PWM control
OUT_WP
OUT_WN
(3) Lead angle: 15 degrees
PWM control
15 degrees
OUT_UP
OUT_UN
OUT_VP
OUT_VN
PWM control
OUT_WP
OUT_WN
PWM control
(4) Lead angle: 30 degrees
OUT_UP
OUT_UN
PWM control
OUT_VP
OUT_VN
OUT_WP
OUT_WN
PWM control
PWM control
7. Lap Turn-on Control
When SEL_LAP = High, the turn-on electrical angle is 120 degrees. When SEL_LAP = Low, Lap Turn-on
Mode starts.
In Lap Turn-on Mode, the time between zero-cross point and the 120-degree turn-on timing becomes
longer (shaded area in the below chart) so as to create some overlap when switching turn-on signals. The
lap time varies depending on the lead angle setting.
Induced voltage
Turn-on signal
U
V
W
(1) Lead angle: 0 degrees
OUT_UP
OUT_UN
PWM control
OUT_VP
OUT_VN
OUT_WP
OUT_WN
PWM control
(2) Lead angle: 7.5 degrees
OUT_UP
OUT_UN
PWM control
OUT_VP
OUT_VN
PWM control
OUT_WP
OUT_WN
PWM control
(3) Lead angle: 15 degrees
OUT_UP
OUT_UN
OUT_VP
OUT_VN
PWM control
OUT_WP
OUT_WN
PWM control
(4) Lead angle: 30 degrees
OUT_UP
OUT_UN
PWM control
OUT_VP
OUT_VN
OUT_WP
OUT_WN
PWM control
PWM control
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TB6548F/FG
8. Start/Stop Control
Start/Stop is controlled using the PWM signal input pin.
A stop is acknowledged when the PWM signal duty is 0, and a start is acknowledged when the ON-signal
of a frequency four times higher than the resonator frequency or greater is input continuously.
Timing chart
PWM signal
Detection
timing
Start
512 periods at the resonator frequency
First detection
Second detection
Start
PWM signal
Detection
timing
Stop
512 periods at the resonator frequency
First detection
Second detection
and stop
Note: Take sufficient care regarding noise on the PWM signal input pin.
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TB6548F/FG
Absolute Maximum Ratings (Ta = 25°C)
Characteristic
Symbol
Rating
Unit
VDD
5.5
V
Vin
−0.3 to VDD + 0.3
V
Power supply voltage
Input voltage
Turn-on signal output current
IOUT
20
mA
Power dissipation
PD
590
mW
Operating temperature
Topr
−30 to 85
°C
Storage temperature
Tstg
−55 to 150
°C
Recommended Operating Conditions (Ta = −30 to 85°C)
Characteristic
Power supply voltage
Input voltage
PWM frequency
Oscillation frequency
Symbol
Test Condition
Min
Typ.
Max
Unit
VDD
⎯
4.5
5.0
5.5
V
Vin
⎯
−0.3
⎯
VDD
+ 0.3
V
fPWM
⎯
⎯
16
⎯
kHz
fosc
⎯
1.0
⎯
10
MHz
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TB6548F/FG
Electrical Characteristics (Ta = 25°C, VDD = 5 V)
Characteristic
Static power supply current
Dynamic power supply current
Input current
Symbol
Test
Circui
t
Min
Typ.
Max
Unit
IDD
⎯
PWM = H, XTin = H
⎯
0.1
0.3
mA
IDD (opr)
⎯
PWM = 50% Duty, XTin = 4 MHz
⎯
1
3
mA
IIN-1 (H)
⎯
VIN = 5 V, PWM, OC, WAVE_U,
SEL_LAP
⎯
0
1
IIN-1 (L)
⎯
VIN = 0 V, PWM, OC, WAVE_U,
SEL_LAP
−75
−50
⎯
IIN-2 (H)
⎯
VIN = 5 V, CW_CCW, LA0, LA1
⎯
50
75
IIN-2 (L)
⎯
VIN = 0 V, CW_CCW, LA0, LA1
−1
0
⎯
VIN (H)
⎯
3.5
⎯
5
Input voltage
Input hysteresis voltage
Test Condition
VIN (L)
⎯
VH
⎯
VO-1 (H)
⎯
VO-1 (L)
⎯
VO-2 (H)
⎯
VO-2 (L)
⎯
VO-3 (H)
⎯
VO-3 (L)
⎯
Output voltage
PWM, OC, SEL_LAP, CW_CCW
WAVE_U, LA0, LA1
PWM, OC, SEL_LAP, CW_CCW
V
GND
⎯
1.5
⎯
0.6
⎯
4.3
⎯
VDD
GND
⎯
0.5
4.0
⎯
VDD
GND
⎯
0.5
4.0
⎯
VDD
GND
⎯
0.5
⎯
0
10
WAVE_U, LA0, LA1
PWM, OC, SEL_LAP, CW_CCW
WAVE_U, LA0, LA1
IOH = −1 mA
OUT_UP, OUT_VP, OUT_WP
IOL = 20 mA
OUT_UP, OUT_VP, OUT_WP
IOH = −20 mA
OUT_UN, OUT_VN, OUT_WN
IOL = 1 mA
µA
V
V
OUT_UN, OUT_VN, OUT_WN
IOH = −0.5 mA
FG_OUT
IOL = 0.5 mA
FG_OUT
VDD = 5.5 V, VOUT = 0 V
IL (H)
⎯
OUT_UP, OUT_VP, OUT_WP
OUT_UN, OUT_VN, OUT_WN
FG_OUT
Output leak current
µA
VDD = 5.5 V, VOUT = 5.5 V
IL (L)
⎯
OUT_UP, OUT_VP, OUT_WP
⎯
0
10
OUT_UN, OUT_VN, OUT_WN
FG_OUT
Output delay time
tpLH
⎯
PWM-Output
tpHL
10
⎯
0.5
1
⎯
0.5
1
µs
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TB6548F/FG
Application Circuit Example
VDD = 5 V
VM = 20 V
VDD
Positional detection signal
WAVE
COMP
OUT_UP
IN_UP
OUT_UN
IN_UN
OUT_VP
IN_VP
OUT_VN
IN_VN
OUT_WP
IN_WP
OUT_WN
IN_WN
PWM signal
PWM
OUT_U
OUT_V
OUT_W
M
FG signal
FG_OUT
RF
VISD1
<TB6548F/FG>
VISD2
GND
1Ω
GND
ISD
Overcurrent detection
signal
0.01 µF
OC
<TA84005F/FG>
Note 1: Utmost care is necessary in the design of the output, VCC, VM, and GND lines since the IC may be destroyed by
short-circuiting between outputs, air contamination faults, or faults due to improper grounding, or by
short-circuiting between contiguous pins.
Note 2: The above application circuit and values mentioned are intended only as an example for reference. Since the
values may vary depending on the motor to be used, appropriate values must be determined through experiment
before use of the device.
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TB6548F/FG
Package Dimensions
Weight: 0.32 g (typ.)
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TB6548F/FG
Notes on Contents
1. Block Diagrams
Some of the functional blocks, circuits, or constants in the block diagram may be omitted or simplified
for explanatory purposes.
2. Equivalent Circuits
The equivalent circuit diagrams may be simplified or some parts of them may be omitted for
explanatory purposes.
3. Timing Charts
Timing charts may be simplified for explanatory purposes.
4. Application Circuits
The application circuits shown in this document are provided for reference purposes only. Thorough
evaluation is required, especially at the mass production design stage.
Toshiba does not grant any license to any industrial property rights by providing these examples of
application circuits.
5. Test Circuits
Components in the test circuits are used only to obtain and confirm the device characteristics. These
components and circuits are not guaranteed to prevent malfunction or failure from occurring in the
application equipment.
IC Usage Considerations
Notes on handling of ICs
[1] The absolute maximum ratings of a semiconductor device are a set of ratings that must not be
exceeded, even for a moment. Do not exceed any of these ratings.
Exceeding the rating(s) may cause the device breakdown, damage or deterioration, and may result
injury by explosion or combustion.
[2] Do not insert devices in the wrong orientation or incorrectly.
Make sure that the positive and negative terminals of power supplies are connected properly.
Otherwise, the current or power consumption may exceed the absolute maximum rating, and
exceeding the rating(s) may cause the device breakdown, damage or deterioration, and may result
injury by explosion or combustion.
In addition, do not use any device that is applied the current with inserting in the wrong orientation
or incorrectly even just one time.
Points to remember on handling of ICs
(1) Back-EMF
When a motor rotates in the reverse direction, stops or slows down abruptly, a current flow back to the motor’s
power supply due to the effect of back-EMF. If the current sink capability of the power supply is small, the
device’s motor power supply and output pins might be exposed to conditions beyond maximum ratings. To avoid
this problem, take the effect of back-EMF into consideration in system design.
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TB6548F/FG
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