TB6588FG [TOSHIBA]

3-Phase Full-Wave PWM Driver for Sensorless DC Motors; 3相全波PWM驱动器，用于无传感器直流电动机


型号：	TB6588FG
厂家：	TOSHIBA
描述：	3-Phase Full-Wave PWM Driver for Sensorless DC Motors 3相全波PWM驱动器，用于无传感器直流电动机驱动器运动控制电子器件传感器信号电路光电二极管电动机控制 CD PC
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中文：	中文翻译
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TB6588FG

TOSHIBA BiCD Integrated Circuit Silicon Monolithic

TB6588FG

3-Phase Full-Wave PWM Driver for Sensorless DC Motors

The TB6588FG is a three-phase full-wave PWM driver for

sensorless brushless DC (BLDC) motors. It controls rotation speed

by changing the PWM duty cycle, based on the voltage of an

analog control input.

Features

•

Sensorless drive in three-phase full-wave mode

PWM chopper control

Controls the PWM duty cycle, based on an analog input

(7-bit ADC)

Weight: 0.79 g (typ.)

•

Output current: I

= 1.5 A typ. (2.5 A max)

OUT

Power supply: V = 7 to 42 V (50 V max)

Overcurrent protection

Forward and reverse rotation

Lead angle control (0°, 7.5°, 15°, 30°)

Overlapping commutation

Rotation speed detecting signal

DC excitation mode to improve starting characteristics

Adjustable DC excitation time and forced commutation time for a startup operation

Forced commutation frequency control: f /(6 × 2¹⁶), f /(6 × 2¹⁷), f /(6 × 2¹⁸), f /(6 × 2¹⁹)

osc

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TB6588FG

Pin Assignment

VM1

VM3

N.C.

LA1

CW_CCW

LA2

FPWM

FST1

FST2

FG_OUT

IR3

N.C.

FMAX

SEL_LAP

IR1

Fin

IR2

OSC_R

OSC_C

N.C.

PGND

START

WAVEP

WAVEM

VM2

VSP

VREF

WAVE

SGND2

SGND1

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TB6588FG

Pin Description

Pin No.

Symbol

VM1

I/O

Description

Motor power supply pin (V = 7 to 42 V). VM1, VM2 and VM3 are connected together inside the

⎯

IC.

U-phase output

V-phase output

Rotation direction select input (This pin has a pull-up resistor.)

CW_CCW

H or open: Clockwise (U → V → W)

Counterclockwise (U → W → V)

Protection enable input (This pin has a pull-up resistor.)

This input determines whether or not to enable the protection functionality when either of the

following conditions is true:

a) the maximum commutation frequency is exceeded.

b) the rotation speed falls below the forced commutation frequency.

H or open: Protection functionality enabled

Protection functionality disabled

N.C.

⎯

No-connect

Selects the upper limit of the maximum commutation frequency. (This pin has a pull-up resistor.)

Maximum commutation frequency (f

H or open: f

): cycles per second equivalent to an electrical degree

MAX

FMAX

/3 × 2¹¹

/3 × 2¹²

Example: f

0.8 kHz @ f

0.4 kHz @ f

= 5 MHz

∼

−

MAX

osc

MAX

osc

∼

−

∼

−

Overlapping commutation select pin (This pin has a pull-up resistor.)

H or open: 120°commutation

SEL_LAP

Overlapping commutation

IR1

IR2

Connection pins for an output shunt resistor

(IR1 and IR2 are connected together inside the IC. However, IR3 is not connected to IR1 or IR2

inside the IC; these three pins must be connected together externally.)

N.C.

⎯

No connect

W-phase output

Power ground pin

PGND

⎯

Overcurrent detection input (This pin has a pull-down resistor.)

All PWM output signals are stopped when OC ≥ 0.5 V (typ).

WAVEP

WAVEM

Positive (+) position signal input

Negative (−) position signal input

Motor power supply pin (V = 7 to 42 V). VM1, VM2 and VM3 are connected together inside the

VM2

⎯

IC.

SGND1

SGND2

Signal ground pin (SGND1 and SGND2 are connected together inside the IC.)

Position signal output

Provides a majority of the voltages of the three phase signals.

WAVE

VREF

Reference voltage output; V

= 5 V (typ.)

REF

Duty cycle/motor speed control input (This pin has a pull-down resistor.)

0 ≤ V < V (L):

Duty = 0%

VSP

(L) ≤ V ≤ V (H):

Sets the PWM duty cycle, based on the analog input.

≈100% duty cycle (127/128)

(H) < V ≤ V

REF

Connection pin for a capacitor to set the startup commutation time and the ramp-up time for the

on state.

DC excitation time setting pins

START

When V ≥ 1 V (typ.), START is driven low, starting DC excitation. When the IP voltage has

reached V

/2, the TB6588FG switches to forced commutation mode.

REF

OSC_C:

OSC_R:

Connection pins for the oscillator capacitor

Connection pins for the oscillator resistor

OSC_C

OSC_R

⎯

∼

5.25 MHz (typ.) when OSC_C = 100 pF and

Example: Internal oscillating frequency (f

)

osc

OSC_R = 20 kΩ

Connection pin for an output shunt resistor

IR3

(IR1 and IR2 are connected together inside the IC. However, IR3 is not connected to IR1 or IR2

inside the IC; these three pins must be connected together externally.)

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TB6588FG

Pin No.

Symbol

I/O

Description

Rotation speed output pin (open-drain)

This output is held low at startup and when an abnormality is detected. In sensorless mode,

pulses are generated at 3 ppr according to the back-EMF.

FG_OUT

Note: 3 ppr = 3 pulses per electrical degree (With a four-pole motor, six pulses are generated

per revolution.)

Forced commutation frequency select inputs (These pins have a pull-down resistor.)

FST2

FST1

Forced commutation frequency: cycles per second equivalent to an electrical degree

FST2: FST1 = H:

/(6 × 2¹⁶) → 12.7 Hz @ f

/(6 × 2¹⁷) → 6.4 Hz @ f

= 5 MHz

∼

−

osc

∼

FST2: FST1 = H:

L or Open: f

= 5 MHz

−

/(6 × 2¹⁸) → 3.2 Hz @ f

/(6 × 2¹⁹) → 1.6 Hz @ f

∼

FST2: FST1 = L or Open: H:

FST2: FST1 = L or Open: L or Open: f

osc

∼

−

PWM frequency (f ) select input (This pin has a pull-down resistor.)

PWM

∼

FPWM

LA2

/128) → f

/256) → f

39 kHz @ f

osc

= 5 MHz

PWM

osc

PWM

∼

−

∼

−

L or Open: f

19.5 kHz @ f

osc

Lead angle select input (These pins have a pull-up resistor.)

LA2: LA1 H or Open : H or Open : 30° lead angleI

LA2: LA1 H or Open : L

∼

−

∼

: 15° lead angle

: H or Open : 7.5° lead angle

−

∼

LA2: LA1

−

LA1

N.C.

VM3

∼

−

: L

: 0° lead angle

⎯

No connect

Motor power supply pin (V = 7 to 42 V). VM1, VM2 and VM3 are connected together inside the

IC.

Fin

This pin provides for thermal dissipation. Board traces should be designed, considering thermal

dissipation from the IC. (Since the fin and the package bottom are electrically connected, the Fin

pin should be connected to insulation or ground.)

Fin

⎯

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TB6588FG

Functional Description

1. Sensorless Drive Mode

Based on the analog voltage input for a startup operation, the rotor is aligned to a known position in DC

excitation mode. Then the forced commutation signal is generated to start the motor rotation. As the motor

rotates, the back-EMF occurs in each phase of the coil.

When a signal indicating the polarity of three phase voltage of the motor, including the back-EMF, is

detected at the position signal inputs (WAVEP, WAVEM), the motor driving signal is automatically switched

from the forced commutation PWM signal to the normal commutation PWM signal that is based on the

position signal input (back-EMF). Then, a BLDC motor starts running in sensorless commutation mode.

2. Startup Operation

At startup, no induced voltage is generated due to the stationary motor, and the rotor position cannot be

detected in sensorless mode. Therefore, the TB6588FG rotor is first aligned to a known position in DC

excitation mode for an appropriate period of time, and then the motor is started in forced commutation mode.

The DC excitation and forced commutation times are determined by external capacitors. These time settings

vary depending on the motor type and load, so that they should be adjusted experimentally.

≥ 1.0 (V)

VSP

AD (L)

(typ.) = C × V /4.5 µA (s)

1 SP

START

REF

VSP

(a) (b)

GND

TB6588FG

FIX

START

(a): DC excitation time: T

(typ.) = 0.69 × C × R (s)

2 1

FIX

(b): Forced commutation time

The rotor is aligned to a known position specified in DC excitation mode for the period of (a), during which

the IP pin voltage decreases from V to V /2. The time constant for the period is determined by C and

REF

R . Then, operation mode is switched to forced commutation mode for the period of (b) as shown above. The

duty cycles for DC excitation and forced commutation modes are determined according to the SC pin voltage.

When the motor rotation frequency exceeds the forced commutation frequency specified by FST1 and FST2,

the operation mode is switched to the sensorless mode. The duty cycle for sensorless mode is determined by

SP.

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TB6588FG

3. SC Signal Delay in Rotational Speed Control (V follow-up property of SC)

The rotational speed and the starting and stopping of the motor are controlled based on an analog voltage at

the V input. However, the actual operation of the IC is determined by the voltage applied to the SC pin.

The voltage at the SC pin equals the charging voltage of the capacitor C , which is determined by the

charging/discharging time of C . This causes a delay in the SC voltage level relative to the V input. When

the voltage at the V pin rises from 1 to 4 V, the SC signal delay occurs as shown below.

SPU

SPL

SPU

SPL

VSP

DOWN

•

Charging time of C (when accelerating): T

(typ.) = C × (V

SPU

− V

)/4.5 µA (s)

SPL

Discharging time of C (when decelerating): T

(typ.) = C × (V

SPU

− V )/37 µA (s)

SPL

DOWN

Note: When the motor is stopped (V < 1 V), the capacitor C at the SC pin is instantly discharged.

(The C is discharged through 2 kΩ (typ.) to GND.)

4. Forced Commutation Frequency

The forced commutation frequency at startup is determined as follows.

Since the optimal frequency varies depending on the motor type and load, it must be adjusted

experimentally.

The forced commutation frequency is determined by the value of external capacitor and resistor, and the

logic level of the FST1 and FST2 pins (These pins have a pull-down resistor).

/(6 × 2¹⁶)

/(6 × 2¹⁷)

/(6 × 2¹⁸)

/(6 × 2¹⁹)

∼

FST2: FST1 = H

FST2: FST1 = L or Open : H

: H

: Forced commutation frequency f

−

osc

∼

: L or Open : Forced commutation frequency f

−

osc

∼

: Forced commutation frequency f

−

osc

∼

FST2: FST1 = L or Open : L or Open : Forced commutation frequency f

−

osc

5. PWM Frequency

The PWM frequency is determined by the value of the external capacitor and resistor, and the logic level of

the FPWM pin (which has a pull-down resistor).

FPWM: H or Open: f

FPWM: L or Open: f

= f /128

osc

= f /256

osc

PWM

The PWM frequency must be sufficiently high relative to the electrical frequency of the motor and within

the range permitted by the driver circuit.

The PWM turn the high-side output transistors off.

PWM signal

driving high-side

transistors

PWM signal

driving low-side

transistors

Motor terminal

voltage

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TB6588FG

6. Motor Speed Control Pin (VSP)

An analog voltage applied to the VSP pin is converted by a 7-bit AD converter and used to control the duty

cycle of the PWM.

0 ≤ V < V

(L) → Duty cycle = 0%

(L) ≤ V ≤ V

(H) < V ≤ V

(H) → Figure on the right (1/128 to 127/128)

→ Duty cycle ≈ 100% (127/128)

REF

Duty Cycle

100%

(L)

(H)

7. Fault Protection Operation

The logic level of the EN pin determines whether to enable the protection functionality.

(The EN pin has a pull-up resistor.)

H or Open : Protection functionality enabled

: Protection functionality disabled

When a behavior as shown below is detected via the WAVEP and WAVEM pins, as the motor is deemed to be

in an abnormal state and the output transistors are turned off. About one second later, the motor is

restarted. The device begins cycling into and out of the protection mode if the abnormality persists.

•

The maximum commutation frequency is exceeded.

•

The rotation speed falls below the forced commutation frequency.

= 1 V or higher

VSP

When the SC pin capacitor = 0.47 µF and

Output pin

START

OFF

= 4 V

C_SC×(VSP−1)

(a): T

OFF

0.47μF ×(4 −1)

1.6μA

= 880 ms (typ.)

(a)

1 V

Fault detected

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TB6588FG

8. Motor Position Detection Error

The position detection is performed synchronizing with the PWM signal generated in the IC. Thus, a

position detection error related to the PWM signal frequency is induced. Care should be taken when the

TB6588FG is used in high-speed motor applications.

The detection is performed on the falling edge of the PWM signal. An error is recognized when the terminal

voltage exceeds the reference voltage.

Detection lag < 1/f

f : PWM frequency = f /256, f /128

p osc osc

: Internal oscillating frequency

osc

Output: ON

Internal PWM signal

Terminal voltage

Reference voltage

Position detection

Ideal detection timing

Actual detection timing

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TB6588FG

9. Lead Angle Control

The TB6588FG runs in forced commutation mode with a lead angle of 0° at startup. After switching to

normal commutation mode, the lead angle is automatically changed to the value set by the LA1 and LA2

pins.

Induced voltage

PWM signal

30°

22.5°

15°

(1) Lead angle of 0°

(2) Lead angle of 7.5°

(3) Lead angle of 15°

0°

(4) Lead angle of 30°

10. Overlapping Commutation Control

When SEL_LAP = High, the TB6588FG runs in 120° commutation mode; When SEL_LAP = Low, it runs in

overlapping commutation mode. In overlapping commutation mode, there occurs an overlapping period due

to the lengthened commutation time between the zero cross point and the 120° commutation timing upon

PWM signal switching as shown in the shaded areas. These periods vary depending on the lead angle

setting.

Induced voltage

PWM signal

30°

22.5°

15°

(1) Lead angle of 0°

(2) Lead angle of 7.5°

(3) Lead angle of 15°

0°

(4) Lead angle of 30°

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TB6588FG

11. Thermal Shutdown (TSD) Circuit (Note)

When the die temperature exceeds the rated TSD temperature, the TSD circuit detects it as the abnormal

state of the motor and the output transistors are turned off.

At the same time, START and SC are set High and Low respectively.

After the TSD circuit is disabled, the TB6588FG restarts its operation following the startup sequence.

= 1 V or higher

VSP

Output pin

START

OFF

1 V

GND

TSD

165°C

TSD Return

150°C

(Reference value) (Reference value)

Note: The TSD circuit is not intended to provide protection against all abnormal conditions. Therefore, the

TB6588FG should exit the abnormal state immediately after the TSD circuit is enabled.

If the device is used beyond the maximum ratings, the TSD circuit may not operate properly, or the device

may break down before the protection circuit is activated.

Also, if the motor keeps running due to inertia after the TSD circuit is activated, the startup sequence may

lose synchronization with the motor rotation, which may prevent the motor from restarting after the TSD

circuit is disabled.

Thus, for a restart operation after the TSD circuit operation, it should be ensured that the motor be stopped

once before being restarted.

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TB6588FG

12. Overcurrent Protection Circuit (Note)

The overcurrent protection circuit limits the current by turning the high-side output transistors off. The

output current is monitored as a voltage across R . If it exceeds the rated V

voltage (0.5 V (typ.)), the

protection functionality is enabled.

The current value that trips the overcurrent protection circuit is calculated as:

= Overcurrent detection voltage V /Resistor value R

OUT

R and C used as an RC filter should be adjusted properly to prevent the malfunction of the overcurrent

protection circuit due to the PWM switching noise.

∼

−

Example: When R = 0.33 [Ω], I (typ.) = 0.5 [V] (typ.)/0.33 [Ω] 1.5 [A]

OUT

VM1 VM2

VM3

TB6588FG

200 kΩ

= 0.5 V

OC IR3

IR1

IR2

OUT

Note: The overcurrent protection circuit (normally a current limiter) is not intended to provide protection against

all abnormal conditions. Therefore, the TB6588FG should exit the abnormal state immediately after the

overcurrent protection circuit is enabled.

If the device is used beyond the maximum ratings, the overcurrent protection circuit may not operate

properly, or the device may break down before the protection circuit is activated.

Also, if the overcurrent still persists after the protection circuit is activated, the device may be destroyed

due to overheating.

If the overcurrent protection circuit remains active, the timing of the position detection that is performed

synchronously with the PWM signal changes. Thus, the motor may lose synchronization. Therefore, the

overcurrent protection circuit must be configured not to operate under normal operation.

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TB6588FG

Input Equivalent Circuits

Some parts are omitted from the equivalent circuit diagrams or simplified for the sake of simplicity.

1. VSP

2. SC

REF

VSP

4. CW_CCW, LA1, LA2, FMAX, SEL_LAP,

3. FPWM, FST1, FST2

REF

Input

5. WAVE, WAVEM, WAVEP

6. OC

REF

200 kΩ

WAVEM

WAVEP

WAVE

7. FG_OUT

8. U, V, W

V ,V ,V

M1 M2 M3

REF

100 Ω

FG_OUT

IR3

IR2

IR1

9. IP

10. START

REF

100 Ω

START

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TB6588FG

11. OSC_R,OSC_C

12. VREF

REF

REF REF REF

REF

VREF

OSC_R

OSC_C

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TB6588FG

Absolute Maximum Ratings (Ta = 25°C)

Characteristics

Power supply voltage

Symbol

Rating

Unit

(Note 1) −0.3 to V

+ 0.3

REF

IN1

Input voltage

(Note 2)

OUT

−0.3 to 30

2.5 (Note 3)

1.3 (Note 4)

3.2 (Note 5)

−30 to 105

−55 to 150

IN2

PWM signal output current

Power dissipation

Operating temperature

Storage temperature

opr

°C

stg

Note 1:

is applicable to the voltage at the following pins: FPWN, FMAX, VSP, CW_CCW, LA1, LA2, OC,

IN1

SEL_LAP, FST1, FST2 and EN

Note 2:

IN2

is applicable to the voltage at the following pins: WAVEP, WAVEM

Note 3: Output current may be limited by the ambient temperature or a heatsink.

The maximum junction temperature should not exceed T

= 150°C.

jmax

Note 4: Measured for the IC only. (Ta = 25°C)

Note 5: Measured when mounted on the board. (140 mm × 70 mm × 1.6 mm, Cu 50%, R

: 39°C/W)

th (j-a)

Operating Ranges (Ta = −30 to 105°C)

Characteristics

Power supply voltage

Symbol

Min

Typ.

Max

Unit

Input voltage

(Note 1) GND

⎯

REF

IN1

Package Power Dissipation

– Ta

3.5

(3)

2.5

(2)

(1)

1.5

0.5

100

125

150

Ambient Temperature Ta (°C)

(1)

only (96°C/W)

th (j-a)

(2) When mounted on the board (114 mm × 75 mm × 1.6 mm, Cu 20% , R

(3) When mounted on the board (140 mm × 70 mm × 1.6 mm, Cu 50% , R

: 65°C/W)

: 39°C/W)

th (j-a)

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TB6588FG

Electrical Characteristics (Ta = 25 °C, V = 24 V, unless otherwise specified)

Characteristics

Symbol

Test Conditions

= 0 V, OSC_C = 0 V

Min

⎯

Typ.

3.5

Max

Unit

Static power supply current at V

Dynamic power supply current at

= 2.5 V, Output: Open

(OSC_C = 100 pF,OSC_R = 20 kΩ)

⎯

4.5

(opr)

= V , SEL_LAP,FMAX

REF

(H)

(L)

⎯

IN-1

CW_CCW, LA1, LA2, EN

= 0 V, SEL_LAP,FMAX

−75

−50

⎯

IN-1

CW_CCW, LA1, LA2, EN

(H)

(L)

(H)

(L)

= V

, OC,FST1, FST2, FPWM

⎯

−1

⎯

−1

⎯

IN-2

REF

= 0 V, OC, FST1, FST2, FPWM

= V , V

IN-2

Input current

µA

150

⎯

IN-3

REF SP

= 0 V, V

IN-3

WAVEM; WAVEM = V /2,WAVEP= 0V

(H)

(L)

⎯

0.25

IN-4

WAVEP; WAVEM = V /2,WAVEP = V

WAVEM; WAVEM= V /2,WAVEP = V

-0.25

−6

-0.1

⎯

IN-4

WAVEP; WAVEM = V /2,WAVEP = 0V

Input offset voltage

Input voltage

WAVE; WAVEP-WAVEM

INO

SEL_LAP, CW_CCW, LA1, LA2, FMAX,

FST1, FST2, EN, FPWM

(H)

(L)

3.5

⎯

IN-1

REF

SEL_LAP, CW_CCW, LA1, LA2, FMAX,

FST1, FST2, EN, FPWM

GND

⎯

1.5

IN-1

Input voltage hysteresis

⎯

GND

⎯

0.45

⎯

0.5

Low-level FG_OUT output voltage

FG_OUT leakage current

=1 mA

= 5.5 V

FG_OUT

µA

FG_OUT

(H)

(L)

= 1.5 A

U, V, W

⎯

0.3

0.35

OUT

Output ON-resistance

Output leakage current

Ω

= −1.5 A

⎯

(H)

= 0 V

⎯

OUT

µA

(L)

= 50 V

⎯

FPWM = L

(L)

1.0

1.2

1.4

(OSC_C = 100 pF, OSC_R = 20 kΩ)

PWM input voltage

(H)

3.9

3.0

⎯

4.1

4.5

880

0.5

4.3

6.5

⎯

charge current

V = 2.5 V

µA

Fault recovery time

= 4 V, SC pin = 0.47 µF

OFF

Overcurrent detection voltage

0.46

0.54

FPWM = H

(OSC_C = 100 pF, OSC_R = 20 kΩ)

PWM frequency

kHz

FPWM = L

(OSC_C = 100 pF, OSC_R = 20 kΩ)

Thermal shutdown temperature

(Design target only.)

TSD

150

165

180

Thermal shutdown

°C

Thermal shutdown hysteresis

(Design target only.)

TSDhys

⎯

REF

output voltage

REF

IV = −1 mA

REF

4.5

5.5

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TB6588FG

Application Circuit Example

MCU

10 kΩ

VREF

Reference voltage circuit

FG_OUT

FPWM

VM1 VM2 VM3

VSP

Speed control

input (analog

voltage)

Startup time

setting

7-bit AD

converter

PWM

control

START

PWM

signal

generator

1-phase excitation

control circuit

REF

FST1

FST2

FMAX

Startup commutation

frequency setting

Timing

setting

SBD

IR3

IR2

Maximum commutation

frequency setting

IR1

LA1

LA2

Overcurrent

protection

circuit

TSD

Lead angle setting

CW_CCW

SEL_LAP

WAVEP

WAVEM

Clock

generation

Position

detection circuit

SGND2 SGND1 PGND Fin

OSC_C OSC_R

WAVE

Note 1: Utmost care is necessary in the design of the output, V , and GND lines since the IC may be destroyed in case of a short-circuit across outputs, a short-circuit to power supply, or a short-circuit to

ground.

Note 2: The above application circuit including constant values is provided only as a guide. Since each value may vary depending on the motor type, the optimal values must be determined experimentally.

Note 3: C , C and R should be connected, if necessary, to prevent malfunction due to noise.

Note 4: A Schottky barrier diode (SBD; Toshiba CMS15) must be connected externally between W and GND to ensure smooth current recovery upon output switching.

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TB6588FG

Package Dimensions

Weight: 0.79 g (typ.)

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TB6588FG

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) Use an appropriate power supply fuse to ensure that a large current does not continuously flow in case

of over current and/or IC failure. The IC will fully break down when used under conditions that exceed

its absolute maximum ratings, when the wiring is routed improperly or when an abnormal pulse noise

occurs from the wiring or load, causing a large current to continuously flow and the breakdown can

lead smoke or ignition. To minimize the effects of the flow of a large current in case of breakdown,

appropriate settings, such as fuse capacity, fusing time and insertion circuit location, are required.

(3) If your design includes an inductive load such as a motor coil, incorporate a protection circuit into the

design to prevent device malfunction or breakdown caused by the current resulting from the inrush

current at power ON or the negative current resulting from the back electromotive force at power OFF.

IC breakdown may cause injury, smoke or ignition.

Use a stable power supply with ICs with built-in protection functions. If the power supply is unstable,

the protection function may not operate, causing IC breakdown. IC breakdown may cause injury,

smoke or ignition.

(4) 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.

2008-4-25

TB6588FG

Points to Remember on Handling of ICs

(1) Over current protection circuit

Over current protection circuits (referred to as current limiter circuits) do not necessarily protect ICs

under all circumstances. If the Over current protection circuits operate against the over current, clear

the over current status immediately.

Depending on the method of use and usage conditions, such as exceeding absolute maximum ratings

can cause the over current protection circuit to not operate properly or IC breakdown before operation.

In addition, depending on the method of use and usage conditions, if over current continues to flow for

a long time after operation, the IC may generate heat resulting in breakdown.

(2) Thermal shutdown circuit

Thermal shutdown circuits do not necessarily protect ICs under all circumstances. If the thermal

shutdown circuits operate against the over temperature, clear the heat generation status immediately.

Depending on the method of use and usage conditions, such as exceeding absolute maximum ratings

can cause the thermal shutdown circuit to not operate properly or IC breakdown before operation.

(3) Heat radiation design

In using an IC with large current flow such as power amp, regulator or driver, please design the device

so that heat is appropriately radiated, not to exceed the specified junction temperature (TJ) at any

time and condition. These ICs generate heat even during normal use. An inadequate IC heat radiation

design can lead to decrease in IC life, deterioration of IC characteristics or IC breakdown. In addition,

please design the device taking into considerate the effect of IC heat radiation with peripheral

components.

(4) 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.

(5) Damage due to Short-Circuits Between Neighboring Pin

Short-circuits between pins 1 and 2, pins 3 and 4 and pins 12 and 13 cause permanent damage to the

TB6588FG. As a result, a large current continuously flow into the device, leading to smoke and

possibly fire. To avoid this, the device application should be designed and adjusted properly, including

the external fail-safe mechanism, such as power supply fuses and overcurrent protection circuitry for

power supply. To minimize the effect of such a current flow in case of damage, ensure that the fuse

capacity, fusing time and overcurrent protection circuitry are properly adjusted.

2008-4-25

TB6588FG

RESTRICTIONS ON PRODUCT USE

070122EBA_R6

• The information contained herein is subject to change without notice. 021023_D

• TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor

devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical

stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety

in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such

TOSHIBA products could cause loss of human life, bodily injury or damage to property.

In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as

set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and

conditions set forth in the “Handling Guide for Semiconductor Devices,” or “TOSHIBA Semiconductor Reliability

Handbook” etc. 021023_A

• The TOSHIBA products listed in this document are intended for usage in general electronics applications

(computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances,

etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires

extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or

bodily injury (“Unintended Usage”). Unintended Usage include atomic energy control instruments, airplane or

spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments,

medical instruments, all types of safety devices, etc. Unintended Usage of TOSHIBA products listed in this

document shall be made at the customer’s own risk. 021023_B

• The products described in this document shall not be used or embedded to any downstream products of which

manufacture, use and/or sale are prohibited under any applicable laws and regulations. 060106_Q

• The information contained herein is presented only as a guide for the applications of our products. No responsibility

is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which may result from

its use. No license is granted by implication or otherwise under any patents or other rights of TOSHIBA or the third

parties. 070122_C

• Please use this product in compliance with all applicable laws and regulations that regulate the inclusion or use of

controlled substances.

Toshiba assumes no liability for damage or losses occurring as a result of noncompliance with applicable laws and

regulations. 060819_AF

• The products described in this document are subject to foreign exchange and foreign trade control laws. 060925_E

2008-4-25

TB6588FG [TOSHIBA]

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