TB6548FG资料

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 12006-03-02

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TB6548F/FG Block Diagram

VDD 13 PWM 3 PWM Control Timing ControlFG_OUT

6 Turn-on SignalForming Circuit14 OUT_UP 17 OUT_VP 21 OUT_WP 15 OUT_UN 19 OUT_VN 22 OUT_WN

SEL_LAP 8 Rotation Instruction Circuit CW_CCW 4 LA0 1 LA1 2 Lead Angle Setting Circuit Overcurrent Protection Circuit 23 OC

Clock Generator Circuit Position Detection Circuit 12GND

24 WAVE

10 XT

11 XTin

Pin Assignment

LA0LA1PWMCW_CCW

NCFG_OUT

NCSEL_LAP

NCXTXTinGND

1234567101112242322212019181716151413WAVE OC OUT_WNOUT_WPNC OUT_VN NC OUT_VP NC OUT_UN OUT_UP VDD

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TB6548F/FG Pin Description

Pin No.

Symbol

I/O

Lead angle setting signal input pin

1 LA0 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

2 LA1 I • LA0 = High, LA1 = High: Lead angle of 30 degrees

•

Built-in pull-down resistor

Description

PWM signal input pin • •

Inputs Low-active PWM signal

Disables input of duty-100% (Low) signal

High for 250 ns or longer is required.

3 PWM I • Built-in pull-up resistor

Rotational direction signal input pin

• High: Reverse (U → W → V) 4 CW_CCW I • Low, Open: Forward (U → V → W)

•

Built-in pull-down resistor

5 NC ⎯ Not connected

Rotational frequency detection signal output pin 6 FG_OUT O • Equivalent to U-phase signal (except PWM) 7 NC ⎯ Not connected

Lap turn-on select pin

• Low: Lap turn-on 8 SEL_LAP I • High: 120 degrees turn-on

•

Built-in pull-up resistor

9 NC ⎯ Not connected 10 XT 11 XTin

⎯ ⎯

Resonator connecting pin •

Selects starting commutation frequency.

17

Starting commutation frequency fst = Resonator frequency fxt/(6 × 2)

12 GND ⎯ 13 VDD

⎯

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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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 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 nsDuty (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 voltagePositional signal

Ideal detection timingActual 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

OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN

UVW 30 degrees PWM controlPWM control22.5 degrees PWM controlPWM control PWM control15 degrees (2) Lead angle: 7.5 degrees OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN

(3) Lead angle: 15 degrees OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN

PWM control PWM control(4) Lead angle: 30 degrees OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN

PWM controlPWM controlPWM 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

(1) Lead angle: 0 degrees

OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN

UVW PWM controlPWM control(2) Lead angle: 7.5 degrees OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN

PWM controlPWM control PWM control(3) Lead angle: 15 degrees OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN

PWM control PWM control(4) Lead angle: 30 degrees OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN

PWM controlPWM controlPWM 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 PWM signal Detection timing First detection Second detection Start 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 Power supply voltage Input voltage

Turn-on signal output current Power dissipation Operating temperature Storage temperature

VDD Vin IOUT

5.5 V −0.3 to VDD + 0.3

V

20 mA PD 590 mW Topr Tstg

−30 to 85 −55 to 150

°C °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 UnitVDD Vin fPWM fosc

⎯ ⎯ ⎯

4.5 5.0 5.5 V −0.3

⎯

VDD

+ 0.3

V

⎯ 16 ⎯ kHz⎯ 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

Symbol IDD IDD (opr) IIN-1 (H)

Input current

IIN-1 (L) IIN-2 (H) IIN-2 (L) VIN (H)

Input voltage

VIN (L)

⎯ Test Circuit

Test Condition

Min

Typ.

Max

Unit

⎯ PWM = H, XTin = H

⎯ PWM = 50% Duty, XTin = 4 MHz ⎯ ⎯ ⎯ ⎯ ⎯

VIN = 5 V, PWM, OC, WAVE_U,

SEL_LAP

VIN = 0 V, PWM, OC, WAVE_U, SEL_LAP

VIN = 5 V, CW_CCW, LA0, LA1 VIN = 0 V, CW_CCW, LA0, LA1 PWM, OC, SEL_LAP, CW_CCW WAVE_U, LA0, LA1

PWM, OC, SEL_LAP, CW_CCW 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

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

⎯ 0.1 0.3 mA ⎯ 1 3 mA ⎯ 0 1 −75

−50

⎯

µA

⎯ 50 75 −1 0 ⎯ 3.5

⎯ 5 V

GND

⎯ 1.5 Input hysteresis voltage

VH VO-1 (H)

⎯ ⎯ 0.6 ⎯ V ⎯ 4.3 ⎯

VDD

VO-1 (L)

⎯ GND ⎯ 0.5 VO-2 (H)

Output voltage

VO-2 (L)

⎯ 4.0 ⎯

VDD

V

⎯ GND ⎯ 0.5 VO-3 (H)

⎯ 4.0 ⎯

VDD

VO-3 (L)

⎯ GND ⎯ 0.5 IL (H)

⎯

OUT_UP, OUT_VP, OUT_WP OUT_UN, OUT_VN, OUT_WN FG_OUT

VDD = 5.5 V, VOUT = 5.5 V

⎯ 0 10 Output leak current µA

IL (L)

⎯

OUT_UP, OUT_VP, OUT_WP OUT_UN, OUT_VN, OUT_WN FG_OUT

⎯ 0 10 Output delay time

tpLH tpHL

⎯ PWM-Output ⎯ 0.5 1 ⎯ 0.5 1 µs

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TB6548F/FG Application Circuit Example

VDD = 5 V VM = 20 VVDD WAVE PWM signal PWM OUT_UP OUT_UN OUT_VP FG signal FG_OUT OUT_VN OUT_WP OUT_WN IN_UP IN_UN IN_VP IN_VN IN_WP RFIN_WN VISD1OC GND ISD GND VISD20.01 µF 1 Ω OUT_UOUT_VOUT_WPositional detection signalCOMP M Overcurrent detection signal

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.

The equivalent circuit diagrams may be simplified or some parts of them may be omitted for explanatory purposes.

Timing charts may be simplified for explanatory purposes.

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.

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.

2. Equivalent Circuits

3. Timing Charts

4. Application Circuits

5. Test Circuits

IC Usage Considerations

[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.

Notes on handling of ICs

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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