TB6548F_06 TOSHIBA | Alldatasheet
Document overview
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- PDF pages: 14
Technical content
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
CW_CCW NC FG_OUT NC SEL_LAP NC X T XTin GND WAVE OC OUT_WN OUT_WP NC OUT_VN NC OUT_VP NC OUT_UN OUT_UP V DD 1211 10 PWM Control Rotation Instruction Circuit Lead Angle Setting Circuit Clock Generator Circuit Timing Control Turn-on Signal Forming CircuitOvercurrent Protection Circuit Position Detection Circuit PWM SEL_LAP CW_CCW LA0 LA1 OUT_UP OUT_VP OUT_WP OUT_UN OUT_VN OUT_WN OC WAVE GND XTin XT VDD FG_OUT
Pin No. Symbol I/O Description
1 LA0 I
2 LA1 I
Lead angle setting signal input pin
- 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
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.
4 CW_CCW I
Rotational direction signal input pin
- High: Reverse (U → W → V)
- Low, Open: Forward (U → V → W)
- Built-in pull-down resistor
5 NC ⎯ Not connected
6 FG_OUT O
Rotational frequency detection signal output pin
- Equivalent to U-phase signal (except PWM)
7 NC ⎯ Not connected
8 SEL_LAP I
- Low: Lap turn-on
- High: 120 degrees turn-on
- Built-in pull-up resistor
9 NC ⎯ Not connected
10 X T ⎯
11 X Tin ⎯
- Selects starting commutation frequency. Starting commutation frequency fst = Resonator frequency fxt/(6 × 217) 12 GND ⎯ Connected to GND. 13 V DD ⎯ Connected to 5 V power supply.
14 OUT_UP O
U-phase upper turn-on signal output pin
- U-phase winding wire positive ON/OFF switching pin
- ON: Low, OFF: High
15 OUT_UN O
U-phase lower turn-on signal output pin
- U-phase winding wire negative ON/OFF switching pin
- ON: High, OFF: Low
16 NC ⎯ Not connected
17 OUT_VP O
V-phase upper turn-on signal output pin
- V-phase winding wire positive ON/OFF switching pin
- ON: Low, OFF: High
18 NC ⎯ Not connected
19 OUT_VN O
V-phase lower turn-on signal output pin
- V-phase winding wire negative ON/OFF switching pin
- ON: High, OFF: Low
20 NC ⎯ Not connected
Pin No. Symbol I/O Description
21 OUT_WP O
W-phase upper turn-on signal output pin
- W-phase winding wire positive ON/OFF switching pin
- ON: Low, OFF: High
22 OUT_WN O
W-phase lower turn-on signal output pin
- W-phase winding wire negative ON/OFF switching pin
- ON: High, OFF: Low
23 OC I
Overcurrent signal input pin
- High on this pin can put constraints on the turn-on signal performing PWM control.
- Built-in pull-up resistor
24 WAVE I
Positional signal input pin
- 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. 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. Duty (max) Duty (min) 250 ns 250 ns
- PWM Control Upper turn-on signal (OUT-P) Lower turn-on signal (OUT-N) Output voltage of the TA84005F/FG
- 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/f p < Detection time variation < 2/fp fp: PWM frequency PWM signal Output voltage of the TA84005F/FG Pin voltage Positional signal Ideal detection timing Actual detection timing Reference voltage
- 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. 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. (3) Lead angle: 15 degrees OUT_WN OUT_VN OUT_WP Induced voltage Turn-on signal (1) Lead angle: 0 degrees OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN (2) Lead angle: 7.5 degrees OUT_UP OUT_UN OUT_VP OUT_UP OUT_UN OUT _VP OUT_VN OUT_WP OUT_WN (4) Lead angle: 30 degrees OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN UV W 30 degrees 22.5 degrees 15 degrees PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control (3) Lead angle: 15 degrees OUT_WN OUT_VN OUT_WP Induced voltage Turn-on signal (1) Lead angle: 0 degrees OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN (2) Lead angle: 7.5 degrees OUT_UP OUT_UN OUT_VP OUT_UP OUT_UN OUT _VP OUT_VN OUT_WP OUT_WN (4) Lead angle: 30 degrees OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN UV W PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control
- 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 Note: Take sufficient care regarding noise on the PWM signal input pin. 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
Absolute Maximum Ratings (Ta = 25°C) Characteristic Symbol Rating Unit Power supply voltage V DD 5.5 V Input voltage V in −0.3 to VDD + 0.3 V Turn-on signal output current I OUT 20 mA Power dissipation P D 590 mW Operating temperature T opr −30 to 85 °C Storage temperature T stg −55 to 150 °C Recommended Operating Conditions (Ta = −30 to 85°C) Characteristic Symbol Test Condition Min Typ. Max Unit Power supply voltage V DD ⎯ 4.5 5.0 5.5 V Input voltage V in ⎯ −0.3 ⎯ VDD + 0.3 V PWM frequency f PWM ⎯ ⎯ 16 ⎯ kHz Oscillation frequency f osc ⎯ 1.0 ⎯ 10 MHz
Electrical Characteristics (Ta = 25°C, VDD = 5 V) Characteristic Symbol Test Circui t Test Condition Min Typ. Max Unit Static power supply current I DD ⎯ PWM = H, XTin = H ⎯ 0.1 0.3 mA Dynamic power supply current I DD (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) ⎯ V IN = 5 V, CW_CCW, LA0, LA1 ⎯ 50 75 Input current IIN-2 (L) ⎯ V IN = 0 V, CW_CCW, LA0, LA1 −1 0 ⎯ µA VIN (H) ⎯ PWM, OC, SEL_LAP, CW_CCW WAVE_U, LA0, LA1 3.5 ⎯ 5 Input voltage VIN (L) ⎯ PWM, OC, SEL_LAP, CW_CCW WAVE_U, LA0, LA1 GND ⎯ 1.5 V Input hysteresis voltage V H ⎯ PWM, OC, SEL_LAP, CW_CCW WAVE_U, LA0, LA1 ⎯ 0.6 ⎯ V VO-1 (H) ⎯ IOH = −1 mA OUT_UP, OUT_VP, OUT_WP 4.3 ⎯ V DD VO-1 (L) ⎯ IOL = 20 mA OUT_UP, OUT_VP, OUT_WP GND ⎯ 0.5 VO-2 (H) ⎯ IOH = −20 mA OUT_UN, OUT_VN, OUT_WN 4.0 ⎯ V DD VO-2 (L) ⎯ IOL = 1 mA OUT_UN, OUT_VN, OUT_WN GND ⎯ 0.5 VO-3 (H) ⎯ IOH = −0.5 mA FG_OUT 4.0 ⎯ V DD Output voltage VO-3 (L) ⎯ IOL = 0.5 mA FG_OUT GND ⎯ 0.5 V IL (H) ⎯ VDD = 5.5 V, VOUT = 0 V OUT_UP, OUT_VP, OUT_WP OUT_UN, OUT_VN, OUT_WN FG_OUT ⎯ 0 10 Output leak current IL (L) ⎯ VDD = 5.5 V, VOUT = 5.5 V OUT_UP, OUT_VP, OUT_WP OUT_UN, OUT_VN, OUT_WN FG_OUT ⎯ 0 10 µA tpLH ⎯ 0.5 1 Output delay time tpHL ⎯ PWM-Output ⎯ 0.5 1 µs
Application Circuit Example Note 1: Utmost care is necessary in the design of the output, V CC, 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. VDD = 5 V FG_OUT PWM OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN OC VDD GND WAVE Overcurrent detection signal Positional detection signal PWM signal FG signal IN_UP IN_UN IN_VP IN_VN IN_WP IN_WN ISD COMP GND VM = 20 V OUT_U OUT_V OUT_W M RF VISD1 VISD2 <TB6548F/FG> <TA84005F/FG> 0.01 µF 1 Ω
Weight: 0.32 g (typ.)
- Block Diagrams Some of the functional blocks, circuits, or constant s 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.