BD63922EFV-E2_技术文档

TECHNICAL NOTE

Stepping Motor Driver Series

Constant Current 2ch

36V Simple Series

BD63922EFV/BD63942EFV/BD63962EFV

ver.1

●Outline

BD63922EFV,BD63942EFV,BD63962EFV are the ultra simple type that provides the minimum function for driving stepping

motor and various protection circuits.

As for its basic function, it is a low power consumption bipolar PWM constant current-drive driver with power supply’s rated

voltage of 36V and rated output current of 0.8A, 1.2A, 1.5A, and each driver is pin-compatible so that replacement can be done

easily. Also it makes μ-STEP drive possible by inputting external DAC signal so that it provides wider application area. There

are excitation modes of FULL STEP & HALF STEP mode. This series contributes to reduction of mounting area, cost down,

safety design.

●Feature

1) Power supply: one system drive (rated voltage of 36V)

2) Rated output current: 0.8A, 1.2A, 1.5A

3) Low ON resistance DMOS output

4) Parallel IN drive mode

5) 2ch drive DC motor

6) PWM constant current control (self oscillation)

7) Built-in spike noise cancel function (external noise filter is unnecessary)

8) FULL STEP applicable to HALF STEP

9) Applicable to μstep drive

10) Forward/reverse break mode for DC motor

11) Power save function

12) Built-in logic input pull-down resistor

13) Power-on reset function

14) Thermal shutdown circuit (TSD)

15) Over current protection circuit (OCP)

16) Under voltage lock out circuit (UVLO)

17) Over voltage lock out circuit (OVLO)

18) Malfunction prevention at the time of no applied power supply (Ghost Supply Prevention)

19) Electrostatic discharge: 4kV (HBM specification)

20) Microminiature, ultra-thin and high heat-radiation (exposed metal type) HTSSOP package

21) Pin-compatible line-up

●Application

Laser beam printer, Scanner, Photo printer, FAX, Ink jet printer, Mini printer, Sewing machine, Toy, and Robot etc.

DEC. 2008

●Absolute maximum ratings(Ta=25℃)

Item

Symbol

V_CC1,2

BD63922EFV

BD63942EFV

-0.2～+36.0

1.1^※1

BD63962EFV

Unit

V

Supply voltage

Power dissipation

Pd

W

4.0^※2

Input voltage for control pin

RNF maximum voltage

Maximum output current

V_IN

V_RNF

I_OUT

-0.2～+5.5

0.5

V

0.8^※3

1.0^※3

1.2^※3

1.5^※3

2.0^※3

A/phase

℃

※4

Maximum output current(peak)

Operating temperature range

Storage temperature range

I_OUTpeak

T_opr

1.5^※3

-25～+85

-55～+150

+150

T_stg

℃

Junction temperature

T_jmax

℃

※1

70mm×70mm×1.6mm glass epoxy board. Derating in done at 8.8mW/℃ for operating above Ta=25℃.

4-layer recommended board. Derating in done at 32.0mW/℃ for operating above Ta=25℃.

Do not, however exceed Pd, ASO and T_jmax=150℃.

※2

※3

※4

Pulse width tw≦1ms, duty 20%.

●Operating conditions(Ta= -25～+85℃)

Item

Symbol

V_CC1,2

I_OUT

BD63922EFV

0.5^※5

BD63942EFV

19～28

BD63962EFV

1.2^※5

Unit

V

Supply voltage

Output current (DC)

0.9^※5

A/phase

※5

Do not however exceed Pd, ASO.

●Electrical characteristics

Applicable to all the series (Unless otherwise specified Ta=25℃, V_cc1,2=24V)

Limit

Item

Symbol

Unit

Condition

Min.

Typ.

Max.

Whole

Circuit current at standby

Circuit current

I_CCST

I_CC

-

0.6

2.7

2.0

7.0

mA

PS=L

PS=H, VREF=0.4V

Control input (IN1A, IN1B, IN2A, IN2B, PS)

H level input voltage

L level input voltage

V_INH

V_INL

2.0

-

V

0.8

Output (OUT1A, OUT1B, OUT2A, OUT2B)

Output ON resistance

R_ON

I_OUT=0.3A

-

2.8

1.4

3.6

1.8

Ω

(BD63920EFV)

Sum of upper and lower

I_OUT=0.7A

Output ON resistance

R_ON

(BD63940EFV)

Sum of upper and lower

Output ON resistance

R_ON

I_OUT=1.0A

-

1.1

-

1.4

10

Ω

(BD63960EFV)

Sum of upper and lower

Output leak current

Current control

I_LEAK

μA

RNFX input current

VREFX input current

VREFX input voltage range

Comparator offset

I_RNFX

I_VREF

-40

-2.0

0

-20

-0.1

-

μA

V

RNFX=0V

-

VREFX=0V

V_REF

0.4

20

1.2

V_COFS

T_ONMIN

-20

0.3

0

mV

μs

VREFX=0.4V

Minimum on time

0.7

R=39kΩ, C=1000pF

2/16

●Characteristics reference data (Unless otherwise specified V_cc1,2=24V)

1.2

0

-0.4

-0.8

-1.2

-1.6

-2

1

85℃

0.8

0.6

0.4

0.2

0

25℃

-25℃

25℃

85℃

-2.4

0

200

400

600

800

0

200

400

600

800

Output Current : I_OUT[mA]

Fig.1 Output H voltage (BD63922EFV)

Fig.2 Output L voltage (BD63922EFV)

0.8

0.7

0

-0.2

-0.4

-0.6

-0.8

85℃

0.6

25℃

0.5

0.4

0.3

0.2

0.1

0

-25℃

-1

-1.2

-1.4

-1.6

-25℃

25℃

85℃

0

200 400 600 800 1000 1200

Output Current : I_OUT[mA]

0

200 400 600 800 1000 1200

Output Current : I_OUT[mA]

Fig.3 Output H voltage (BD63942EFV)

Fig.4 Output L voltage (BD63942EFV)

0.8

0

-0.2

-0.4

-0.6

85℃

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

25℃

-25℃

-0.8

-25℃

-1

25℃

-1.2

85℃

-1.4

0

250 500 750 1000 1250 1500

Output Current : I_OUT[mA]

0

250 500 750 1000 1250 1500

Output Current : I_OUT[mA]

Fig.5 Output H voltage (BD63962EFV)

Fig.6 Output L voltage (BD63962EFV)

3/16

●Terminal function

1) BD63922EFV/BD63942EFV/BD63962EFV

No.

Pin name

Function

Pin name

Function

No.

1

PGND

IN2B

Ground terminal

13

14

15

IN1A

PGND

VCC1

Logic input terminal

2

Ground terminal

Logic input terminal

3

VREF2

Output current value setting terminal

Power supply terminal

Connection terminal of CR for setting PWM

frequency

H bridge output terminal

4

5

CR2

NC

16

17

OUT1A

RNF1

Connection terminal of resistor for output

current detection

Non connection

Terminal for testing

H bridge output terminal

6

7

8

TEST

GND

PS

18

19

20

OUT1B

OUT2B

RNF2

(used by connecting with GND)

Ground terminal

H bridge output terminal

Connection terminal of resistor for output

current detection

Power save terminal

Connection terminal of CR for setting PWM

frequency

H bridge output terminal

9

CR1

21

OUT2A

10

11

12

VREF1

IN1B

NC

Output current value setting terminal

Logic input terminal

22

23

24

VCC2

NC

Power supply terminal

Non connection

IN2A

Logic input terminal

●Block diagram･Application circuit diagram･Input output equivalent circuit diagram

Set the PWM frequency.

Setting range is

Resistor for current detection.

Setting range is

C:470pF～4700pF

R:10kΩ～100kΩ

0.2Ω～0.9Ω(BD63922EFV)

0.2Ω～0.5Ω(BD63942EFV)

0.2Ω～0.4Ω(BD63962EFV)

Refer to P.6 for detail.

VCC1

Refer to P.8,13 for detail.

15

13

IN1A

OUT1A

16

18

IN1B 11

LOGIC

Predriver

CR1

9

ONE

OUT1B

RNF1

17

SHOT

39kΩ

1000pF

0.3Ω

OCP

Be sure to short VCC1 & VCC2.

VREF1 10

Current

Limit

Comp.

VCC2

22

24

2

IN2A

OUT2A

21

19

0.1uF

100uF

IN2B

CR2

LOGIC

Predriver

4

ONE

OUT2B

RNF2

Bypass capacitor.

Setting range is

SHOT

20

39kΩ

1000pF

0.3Ω

100uF～470uF(electrolytic)

0.01uF～0.1uF(multilayer ceramic etc.)

Refer to P.6 for detail.

OCP

VREF2

3

Current

Limit

Comp.

Set the PWM frequency.

Setting range is

C:470pF～4700pF

R:10kΩ～100kΩ

TEST

PS

6

8

PGND

GND

1

14

7

RESET

Regulator

Refer to P.8,13 for detail.

Resistor for current detection.

Setting range is

0.2Ω～0.9Ω(BD63922EFV)

0.2Ω～0.5Ω(BD63942EFV)

0.2Ω～0.4Ω(BD63962EFV)

Refer to P6 for detail.

TSD

UVLO

OVLO

Terminal for testing.

Please connect to GND.

Fig.7 Block diagram & Application circuit diagram

4/16

VCC

circuit

VCC

IN1A

IN1B

IN2A

IN2B

circuit

VREF1

VREF2

5kΩ

10kΩ

100kΩ

VCC

VREG

(internal regulator)

VCC

5kΩ

CR1

CR2

OUT1A, OUT2A

OUT1B, OUT2B

RNF1, RNF2

5kΩ

circuit

Fig.8 Input output equivalent circuit diagram

●Points to notice for terminal description and PCB layout

○PS／Power save terminal

PS can make circuit standby state and make motor output OPEN. Please be careful because there is a delay of 40µs(max.)

before it is returned from standby state to normal state and the motor output becomes ACTIVE.

PS

L

State

Standby state (RESET)

ACTIVE

H

○IN1A, IN1B, IN2A, IN2B／Control logic input terminal

These terminals decide output state.

Input

Output

IN1A

IN2A

IN1B

IN2B

OUT1A

OUT2A

OUT1B

OUT2B

PS

L

Stand by

X

OPEN

(All circuits)

H

L

H

L

OPEN

Stand by

Forward

Reverse

Brake

H

L

H

L

H

X: H or L

5/16

○TEST Terminal／Terminal for testing

This is the terminal used at the time of shipping test. Please connect to GND. Be aware that there is a possibility of

malfunction depending on conditions when GND is unconnected.

○VCC1,VCC2／Power supply terminal

Motor’s drive current is flowing in it, so please wire in such a way that the wire is thick & short and has low impedance.

Voltage VCC may have great fluctuation, so please arrange the bypass capacitor of about 100μF～470μF as close to the

terminal as possible and adjust in such a way that the voltage VCC is stable. Please increase the capacity if needed

especially when a large current is used or those motors that have great back electromotive force are used. In addition, for the

purpose of reducing of power supply’s impedance in wide frequency bandwidth, parallel connection of multi-layered ceramic

capacitor of 0.01μF～0.1μF etc is recommended. Extreme care must be used to make sure that the voltage VCC does not

exceed the rating even for a moment. VCC1 & VCC2 are shorted inside IC, so please be sure to short externally VCC1 &

VCC2 when using. If used without shorting, malfunction or destruction may occur because of concentration of current routes

etc., so please make sure that they are shorted when in use. Still more, in the power supply terminal, there is built-in clamp

component for preventing of electrostatic destruction. If steep pulse or voltage of surge more that maximum absolute rating

is applied, this clamp component operates, as a result there is the danger of destruction, so please be sure that the

maximum absolute rating must not be exceeded. It is effective to mount a Zener diode of about the maximum absolute rating.

Moreover, the diode for preventing of electrostatic destruction is inserted between Vcc terminal and GND terminal, as a

result there is the danger of IC destruction if reverse voltage is applied between Vcc terminal and GND terminal, so please

be careful.

○GND,PGND／Ground terminal

In order to reduce the noise caused by switching current and to stabilize the internal reference voltage of IC, please wire in

such a way that the wiring impedance from this terminal is made as low as possible to achieve the lowest electrical potential

no matter what operating state it may be.

○OUT1A,OUT1B,OUT2A,OUT2B／H Bridge output terminal

Motor’s drive current is flowing in it, so please wire in such a way that the wire is thick & short and has low impedance. It is

also effective to add a Schottky diode if output has positive or negative great fluctuation when large current is used etc, for

example, if counter electromotive voltage etc. is great. Moreover, in the output terminal, there is built-in clamp component for

preventing of electrostatic destruction. If surge or voltage more that maximum absolute voltage is applied, this clamp

component operates, as a result there is the danger of even destruction, so please be sure that the maximum absolute rating

must not be exceeded.

○RNF1,RNF2／Connection terminal of resistor for detecting of output current

Connect the current detection resistors of the values that correspond to each product (IC) between the terminal and GND.

(see page 4) In view of the power consumption of the current-detecting resistor, please determine the resistor in such a way

that W=I_OUT²･R[W] does not exceed the power dissipation of the resistor. In addition, please wire in such a way that it has a

low impedance and does not have a impedance in common with other GND patterns because motor’s drive current flows in

the pattern through RNF terminal～current-detecting resistor～GND. Please do not exceed the rating because there is the

possibility of circuits’ malfunction etc. if RNF voltage has exceeded the maximum rating (0.5V). Moreover, please be careful

because if RNF terminal is shorted to GND, large current flows without normal PWM constant current control, then there is

the danger that OCP or TSD will operate. If RNF terminal is open, then there is the possibility of such malfunction as output

current does not flow either, so please do not let it open.

○VREF／Output current value-setting terminal

This is the terminal to set the output current value. The output current value can be set by VREF voltage and

current-detecting resistor (RNF resistor).

BD63922EFV: Output current I_OUT[A] = VREF [V] / {RNF [Ω] + 0.046}

BD63942EFV: Output current I_OUT[A] = VREF [V] / {RNF [Ω] + 0.043}

BD63962EFV: Output current I_OUT[A] = VREF [V] / {RNF [Ω] + 0.035}

Please avoid using it with VREF terminal open because if VREF terminal is open, the input is unsettled, and the VREF

voltage increases, and then there is the possibility of such malfunctions as the setting current increases and a large current

flows etc. Please keep to the input voltage range because if the voltage of over 0.5V is applied on VREF terminal, then there

is also the danger that a large current flows in the output and so OCP or TSD will operate. Besides, please take into

consideration the outflow current (max.2µA) if inputted by resistance division when selecting the resistance value. The

minimum current, which can be controlled by VREF voltage, is determined by motor coil’s L & R values and minimum ON

time because there is a minimum ON time in PWM drive. It is also effective to bias from exterior at the condition of VREF1

and VREF2 are shorted except when μSTEP drive that is described on page 10 is performed.

6/16

○CR1,CR2／Connection terminal of CR for setting PWM frequency

This is the terminal to set the minimum ON time and OFF time. Please connect the external C(470pF～4700pF) and R(10k

Ω～100kΩ) between this terminal and GND.

The OFF time is determined by Toff[s]≒C･R･0.81. Please interconnect from external components to GND in such a way that

the interconnection does not have impedance in common with other GND patterns. In addition, please carry out the pattern

design in such ways as keeps such steep pulses as square wave etc. away and that there is no noise plunging. Please

mount the two components of C and R if being used by PWM constant current control because normal PWM constant

current control becomes impossible if CR terminal is open or it is biased externally. If the PWM frequency is low, there is a

possibility that it will cause noise by being in the human auditory range, therefore pay attention to OFF time not to become

longer than 50μsec.

○NC terminal

This terminal is unconnected electrically with IC internal circuit. Have this terminal open or GND connected.

○IC back side metal／Metal for heat-radiation

For HTSSOP-B24 package, the heat-radiating metal is mounted on IC’s back side, and on the metal the heat-radiating

treatment is performed when in use, which becomes the precondition to use, so please secure sufficiently the heat-radiating

area by surely connecting by solder with the GND plane on the board and getting as wide GND pattern as possible. Please

be careful because the allowable loss as shown in page 12 can not be secured if not connected by solder. Moreover, the

back side metal is shorted with IC chip’s back side and becomes the GND potential, so there is the danger of malfunction

and destruction if shorted with potentials other than GND, therefore please absolutely do not design patterns other than GND

through the IC’s back side.

●PWM Constant current control

1) Current control operation

Output transistor is turned on and so the output current increases, and when the RNF voltage (the voltage is converted into

by output current due to external resistor of RNF terminal) reaches the voltage value, which is VREF input voltage, the

current limit comparator operates and enters the current decay mode. After that, the OFF time, which is caused by CR timer,

has passed before the output is again turned on. The above-mentioned process is repeated.

2) Noise cancel function

In order to avoid the incorrect detection of current-detecting comparator’s caused by RNF spike noise that occurs at the time

of output ON, the noise cancel time Tn is set up, so the current detection within the noise cancel time immediately after the

output transistor is turned on is invalid. Therefore, the constant current drive is possible without external filter. And the noise

cancel time becomes the minimum ON time of the motor output transistor.

7/16

3) CR Timer

CR voltage is clamped at 0.9V (Typ.) during output ON, and as soon as the output current reaches the current limit value and

enters the current decay mode, the discharge begins and goes on till 0.4V(Typ.), then the output is turned on again and the

charge begins simultaneously. The time taken to discharge from 0.9V (Typ.) to 0.4V (Typ.) is the OFF time Toff. In addition,

CR terminal starts charging, and the time taken to charge from 0.4V (Typ.) to 0.8V (Typ.) is the noise cancel time Tn. Then,

Toff and Tn can be set by CR terminal’s external constant according to the following formula (Typ.).

T_off[s]≒C･R･0.81

T_n[s]≒C･R'･ln[(VCR-0.4)/(VCR-0.8)]

In the formula: VCR=V･R/(R'+R)

V : internal regulator voltage 5V(Typ.)

R': CR terminal’s internal impedance of 5kΩ(Typ.)

Spike noise

Current limit value

Output current

0mA

Current limit value

RNF voltage

GND

0.9V

0.8V

CR voltage

0.4V

Noise cancel time T_n

Discharge time：OFF time T_off

GND

Fig.9 Timing chart of CR voltage, RNF voltage, and output current

Please use the resistor of over 10kΩ(10kΩ～100kΩ recommended) because if the resistance value is low, the clamp

voltage 0.9V(Typ.) can not be reached. If a capacitor with a value of a few thousand pico farad is used (470pF～4700pF

recommended), the noise cancel time Tn becomes longer, and there is the danger that the output current, which is flowing, is

greater than the current limit value because of L and R values of motor coil. Moreover, it is necessary to be careful because if

the OFF time Toff is set longer than normal, the output current’s ripple becomes larger, the average current is decreased,

and then the rotating efficiency may be reduced. Please choose the optimal value in order to reduce the motor drive noise

and the distortion of output current’s waveform etc. to a minimum.

●Current decay mode

For the PWM constant current drive of this IC, the current decay mode is SLOW DECAY mode. Moreover, in order to reduce

the power consumption of IC to a minimum, SLOW DECAY adopts the current decay based on the synchronous rectification

mode, so low-power-consumption and high-efficiency drive is realized. The state of output transistor and the route of motor’s

regenerative current during current attenuating for SLOW DECAY mode are as follows.

When the current attenuates, the voltage between motor

coils is small and the regenerative current decreases slowly,

OFF→OFF

ON→OFF

OFF→ON

so the current ripple becomes smaller, which is favorable for

motor torque. But the output current increases due to

deterioration of current control characteristic in small

current region, or it is easily affected by motor's BEMF at

the time of high pulse rate drive related to the modes of

HALF STEP and QUARTER STEP*, so change of current

limit value cannot be followed, current waveform distorts

and motor vibration may increase. It is most suitable to the

FULL STEP mode and the modes of the HALF STEP and

QUARTER STEP* of low pulse rate drive.

M

ON→ON

output on

current decay

Fig.10 Route of regenerative current during current decay

*There is a necessity of external DAC in order to realize the

QUARTER STEP mode with this series.

8/16

●Example of control sequence and torque vector

You can drive a stepping motor with FULL step mode and HALF step mode and quarter step mode by the following logic input

(IN1A, IN1B, IN2A, IN2B) sequence. See page 6 for current value set.

FULL STEP

①

②

③

④

OUT1A

100%

IN1A

IN1B

IN2A

IN2B

4

3

1

2

OUT2A

OUT2B

100%

IOUT(CH1)

IOUT(CH2)

-100%

100%

-100%

OUT1B

IN1A

IN1B

IN2A

IN2B

OUT1A OUT1B OUT2A OUT2B

①

②

③

④

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

H

L

Fig.11 Control Sequence at FULL STEP

HALF STEP

①

②

③

④

⑤

⑥

⑦

⑧

OUT1A

1

IN1A

IN1B

IN2A

IN2B

100%

2

8

6

7

3

OUT2B

OUT2A

100%

IOUT(CH1)

IOUT(CH2)

4

-100%

100%

5

-100%

OUT1B

IN1A

IN1B

IN2A

IN2B

OUT1A OUT1B OUT2A OUT2B

①

②

③

④

⑤

⑥

⑦

⑧

H

L

H

L

H

L

OPEN

H

L

H

L

OPEN

H

L

H

L

H

L

OPEN

H

L

H

OPEN

L

H

L

OPEN

H

OPEN

L

H

L

H

Fig.12 Control Sequence at HALF STEP

9/16

●μSTEP mode

This IC makes it possible to set output current value of CH1, CH2 by VREF1, VREF2 terminal, and output logic of CH1,

CH2 by IN1A, IN1B, IN2A, IN2B respectively. Therefore μSTEP drive can be realized by inputting linear voltage into

VREF with external DAC and controlling IN1A, IN1B, IN2A, IN2B terminal

IN1A

IN1B

IN2A

IN2B

VREF1

VREF2

Iout(CH1)

Iout(CH2)

Fig.13 Input signal and motor drive current at μSTEP drive

●Protection Circuits

○Thermal Shutdown (TSD)

This IC has a built-in thermal shutdown circuit for thermal protection. When the IC’s chip temperature rises above 175℃

(Typ.), the motor output becomes OPEN. Also, when the temperature returns to under 150℃ (Typ.), it automatically returns

to normal operation. However, even when TSD is in operation, if heat is continued to be added externally, heat overdrive can

lead to destruction.

○Over Current Protection (OCP)

This IC has a built in over current protection circuit as a provision against destruction when the motor outputs are shorted

each other or Vcc-motor output or motor output-GND is shorted. This circuit latches the motor output to OPEN condition

when the regulated threshold current flows for 4µs (Typ.). It returns with power reactivation or a reset of the PS terminal. The

over current protection circuit’s only aim is to prevent the destruction of the IC from irregular situations such as motor output

shorts, and is not meant to be used as protection or security for the set. Therefore, sets should not be designed to take into

account this circuit’s functions. After OCP operating, if irregular situations continues and the return by power reactivation or a

reset of the PS terminal is carried out repeatedly, then OCP operates repeatedly and the IC may generate heat or otherwise

deteriorate. When the L value of the wiring is great due to the wiring being long, after the over current has flowed and the

output terminal voltage jumps up and the absolute maximum values may be exceeded and as a result, there is a possibility

of destruction. Also, when current which is over the output current rating and under the OCP detection current flows, the IC

can heat up to over T_jmax=150℃ and can deteriorate, so current which exceeds the output rating should not be applied.

○Under Voltage Lock Out (UVLO)

This IC has a built-in under voltage lock out function to prevent false operation such as IC output during power supply under

voltage. When the applied voltage to the Vcc terminal goes under 15V (Typ.), the motor output is set to OPEN. This

switching voltage has a 1V (Typ.) hysteresis to prevent false operation by noise etc. Please be aware that this circuit does

not operate during power save mode.

○Over Voltage Lock Out (OVLO)

This IC has a built-in over voltage lock out function to protect the IC output and the motor during power supply over voltage.

When the applied voltage to the VCC terminal goes over 32V (Typ.), the motor output is set to OPEN. This switching voltage

has a 1V (Typ.) hysteresis and a 4µs (Typ.) mask time to prevent false operation by noise etc. Although this over voltage

locked out circuit is built-in, there is a possibility of destruction if the absolute maximum value for power supply voltage is

exceeded, therefore the absolute maximum value should not be exceeded. Please be aware that this circuit does not

operate during power save mode.

10/16

○False operation prevention function in no power supply (Ghost Supply Prevention)

If a logic control signal is input when there is no power supplied to this IC, there is a function which prevents the false

operation by voltage supplied via the electrostatic destruction prevention diode from the logic control input terminal to the

Vcc, to this IC or to another IC’s power supply. Therefore, there is no malfunction of the circuit even when voltage is supplied

to the logic control input terminal while there is no power supply.

●Thermal design

Please confirm that the IC’s chip temperature Tj is not over 150℃, while considering the IC’s power consumption (W), package

power (Pd) and ambient temperature (Ta). When Tj=150℃ is exceeded the functions as a semiconductor do not operate and

problems such as parasitism and leaks occur. Constant use under these circumstances leads to deterioration and eventually

destruction of the IC. T_jmax=150℃ must be strictly obeyed under all circumstances.

○Thermal Calculation

The IC’s consumed power can be estimated roughly with the power supply voltage (V_CC), circuit current (I_CC), output ON

resistance (R_ONH,R_ONL) and motor output current value (I_OUT).

The calculation method during FULL STEP drive, SLOW DECAY mode is shown here:

Consumed power of the Vcc [W] = V_CC[V]･I_CC[A] ･･･････①

Consumed power of the output DMOS [W] = (R_ONH[Ω] + R_ONL[Ω])･I_OUT[A]²･2[ch]･on_duty

During output ON

+ (2･R_ONL[Ω])･I_OUT[A]²･2[ch]･(1 - on_duty) ･･･････②

During current decay (recovery)

However, on_duty: PWM on duty = Ton / (Ton+Toff)

Ton varies depending on the L and R values of the motor coil and the current set value. Please confirm by actual

measurement, or make an approximate calculation.

Toff is the OFF time which depends on the external CR. See page 8 for details.

Upper PchDMOS ON Resistance

Lower NchDMOS ON Resistance

Model Number

R_ONH[Ω] (Typ.)

R_ONL[Ω] (Typ.)

BD63922EFV

BD63942EFV

BD63962EFV

2.0

1.0

0.7

0.8

0.4

Consumed power of total IC W_total [W] = ① + ②

Junction temperature Tj = Ta[℃] + θ_ja[℃/W]･W_total [W]

However, the thermal resistance valueθ_ja[℃/W] differs greatly depending on circuit board conditions. Refer to the derating

curve on page 12. Also, we are taking measurements of thermal resistance valueθ_jaof boards actually in use. Please feel

free to contact our salesman.

The calculated values above are only theoretical. For actual thermal design, please perform sufficient thermal evaluation for

the application board used, and create the thermal design with enough margin to not exceed T_jmax=150℃.

Although unnecessary with normal use, if the IC is to be used under especially strict heat conditions, please consider

externally attaching a Schottky diode between the motor output terminal and GND to abate heat from the IC.

11/16

●Temperature Monitoring

There is a way to directly measure the approximate chip temperature by using the TEST terminal. However, temperature

monitor using this TEST terminal is only for evaluation and experimenting, and must not be used in actual usage conditions.

TEST terminal has a protection diode for prevention from electrostatic discharge. The temperature may be monitored using

this protection diode.

(1) Measure the terminal voltage when a current of Idiode=50μA flows from the TEST terminal to the GND, without

supplying V_CCto the IC. This measurement is of the V_Fvoltage inside the diode.

(2) Measure the temperature characteristics of this terminal voltage. (V_Fhas a linear negative temperature factor

against the temperature.) With the results of these temperature characteristics, chip temperature may be

calibrated from the TEST terminal voltage.

(3) Supply V_CC, confirm the TEST terminal voltage while running the motor, and the chip temperature can be

approximated from the results of (2).

VCC

circuit

-Vf[mV]

TEST

circuit

100kΩ

Idiode

V

25

150

Chip temperature T_j[℃]

Fig.14 Model diagram for measuring chip temperature

Fig.15 Tj and terminal voltage

●Power dissipation

○HTSSOP-B24 Package (BD63922EFV/BD63942EFV/BD63962EFV))

HTSSOP-B24 has exposed metal on the back, and it is possible to dissipate heat from a through hole in the back. Also, the

back of board as well as the surfaces has large areas of copper foil heat dissipation patterns, greatly increasing power

dissipation. The back metal is shorted with the back side of the IC chip, being a GND potential, therefore there is a possibility

for malfunction if it is shorted with any potential other than GND, which should be avoided. Also, it is recommended that the

back metal is soldered onto the GND to short. Please note that it has been assumed that this product will be used in the

condition of this back metal performed heat dissipation treatment for increasing heat dissipation efficiency.

Measurement machine：TH156（Kuwano Electric）

Measurement condition：ROHM board

Board size：70*70*1.6mm³

(With through holes on the board)

4.0W

4

3

4.0

3.0

The exposed metal of the backside is connected to the board with

solder.

Board①：1-layer board(Copper foil on the back 0mm²)

Board②：2-layer board(Copper foil on the back 15*15mm²)

Board③：2-layer board(Copper foil on the back 70*70mm²)

Board④：4-layer board(Copper foil on the back 70*70mm²)

2.8W

Board①：θ_ja=113.6℃/W

Board②：θ_ja=73.5℃/W

Board③：θ_ja=44.6℃/W

Board④：θ_ja=31.3℃/W

1.7W

1.1W

2.0

2

1

1.0

0

50

100

Ambient Temperature : Ta[℃]

Fig.16 HTSSOP-B24 Derating curve

125

25

75

150

12/16

●Example of application [For BD63922EFV (see page 6)]

○Setting the Current Control Value (VREF and RNF terminals)

We will consider a situation where the RNF terminal’s resistance value is the recommended 0.5Ω and the output current is

set to 0.288A. Because I_OUT=VREF[V] / {RNF[Ω] + 46[mΩ]}

the VREF voltage necessary for I_OUT=0.288A is 0.157V.

This means that when the RNF terminal’s resistance value is 0.5Ω, VREF voltage=(0.5+0.046)×Output current.

VREF terminal voltage is set to 0.157V due to resistance division.

The VREF terminal’s outflow current is max. 2μA when considering the maximum value of the electrical characteristics, yet

here, current is max. 4μA at double the current by assuming VREF1 and VREF2 are shorted. As for the bias current of the

resistance division, it is necessary to set a sufficient current value that does not fluctuate the reference potential of the

resistance division with this current of 4μA.

As an example, we will consider that a current 40 times of 4μA (160μA) is set to be applied.

If the voltage applied to the resistance division is 3.3V,

3.3V

3.3[V] / 160[μA]=20.6[kΩ]

becomes the sum of R₁and R₂’s resistance values. (R₁+R₂=20.6[kΩ])

Therefore, to make the VREF terminal voltage 0.157V

3.3[V]･R₂/ (R₁+R₂) =0.157[V]

VREF 1

VREF 2

R₁

R₂

Settings of R₁=20kΩ and R₂=1kΩ is one of good condition.

Fig.17 Example of VREF voltage setting

○Setting the PWM Frequency (CR terminal)

The setting method decides the optimal value with respect to the output current ripple, consumed power and noise cancel

time T_n(minimum ON time).

The OFF time T_offand noise cancel time T_n(minimum ON time t_ONMIN) can be set with an external CR constant values.

Please see page 8 for details.

[To adjust output current ripple]

The output current ripple depends on the L and R values of the motor coil as well as the current decay mode, so first the

current ripple should be confirmed by driving the motor under actual application conditions with the recommended

values of C=1000[pF], R=39[kΩ] and OFF time T_off=32[μs]. If there are any problems with the ripple, the optimal OFF

time should be set by adjusting R values.

At this time, if the OFF time T_offneeds to be shortened, it is recommended that the R value is adjusted. If the C value is

made smaller the noise cancel time T_nis shortened and there is a possibility of malfunction caused by the RNF spike

noise, which is generated at output ON.

[To adjust noise cancel time]

Because the noise level of the RNF spike noise varies depending on the capacity or inductance components etc of the

board and pattern, if there is any malfunction caused by the RNF spike noise at the recommended value of C=1000[pF],

the noise cancel time T_nshould be lengthened by making the C value greater. Be aware that if the C value is doubled, the

OFF time T_offis also doubled and the R value needs to be halved.

There are various combinations of C and R values, but they must be set within the ranges of the recommended values

(C:470pF~4700pF, R:10kΩ~100kΩ)(see page 8). Also, if the PWM frequency is low, there is a possibility that it will cause

noise by being in the human auditory range, therefore OFF time should not exceed 50μsec. On the other hand, if the

frequency is too high, there is a possibility with the relative electrical time constant that the set current is not applied to the

motor, depending on the L and R values of the motor coil.

13/16

●Usage Notes

(1) Absolute maximum ratings

An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can

break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit. If any

over rated values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices, such as

fuses.

(2) Connecting the power supply connector backward

Connecting of the power supply in reverse polarity can damage IC. Take precautions when connecting the power supply

lines. An external direction diode can be added.

(3) Power supply Lines

Design PCB layout pattern to provide low impedance GND and supply lines. To obtain a low noise ground and supply line,

separate the ground section and supply lines of the digital and analog blocks. Furthermore, for all power supply terminals

to ICs, connect a capacitor between the power supply and the GND terminal. When applying electrolytic capacitors in the

circuit, not that capacitance characteristic values are reduced at low temperatures.

(4) GND Potential

The potential of GND pin must be minimum potential in all operating conditions.

(5) Metal on the backside (Define the side where product markings are printed as front)

The metal on the backside is shorted with the backside of IC chip therefore it should be connected to GND. Be aware that

there is a possibility of malfunction or destruction if it is shorted with any potential other than GND.

(6) Thermal design

Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions.

Users should be aware that this series has been designed to expose their frames at the back of the package, and should

be used with suitable heat dissipation treatment in this area to improve dissipation. As large a dissipation pattern should be

taken as possible, not only on the front of the baseboard but also on the back surface.

(7) Mounting errors and inter-pin shorts

When attaching to a printed circuit board, pay close attention to the direction of the IC and displacement. Improper

attachment may lead to destruction of the IC. There is also possibility of destruction from short circuits which can be

caused by foreign matter entering between outputs or an output and the power supply or GND.

(8) Operation in a strong electric field

Use caution when using the IC in the presence of a strong electromagnetic field as doing so may cause the IC to

malfunction.

(9) ASO

When using the IC, set the output transistor so that it does not exceed absolute maximum ratings or ASO.

(10) Thermal shutdown circuit

The IC has a built-in thermal shutdown circuit (TSD circuit). If the chip temperature becomes T_jmax=150℃, and higher, coil

output to the motor will be open. The TSD circuit is designed only to shut the IC off to prevent runaway thermal operation.

It is not designed to protect or indemnify peripheral equipment. Do not use the TSD function to protect peripheral

equipment.

TSD on temperature [℃] (Typ.)

Hysteresis Temperature [℃] (Typ.)

175

25

(11) Inspection of the application board

During inspection of the application board, if a capacitor is connected to a pin with low impedance there is a possibility that

it could cause stress to the IC, therefore an electrical discharge should be performed after each process. Also, as a

measure again electrostatic discharge, it should be earthed during the assembly process and special care should be taken

during transport or storage. Furthermore, when connecting to the jig during the inspection process, the power supply

should first be turned off and then removed before the inspection.

14/16

(12) Input terminal of IC

This IC is a monolithic IC, and between each element there is a P+ isolation for element partition and a P substrate.

This P layer and each element’s N layer make up the P-N junction, and various parasitic elements are made up.

For example, when the resistance and transistor are connected to the terminal as shown in figure 18,

○When GND＞(Terminal A) at the resistance and GND＞(Terminal B) at the transistor (NPN),

the P-N junction operates as a parasitic diode.

○Also, when GND＞(Terminal B) at the transistor (NPN)

The parasitic NPN transistor operates with the N layers of other elements close to the aforementioned

parasitic diode.

Because of the IC’s structure, the creation of parasitic elements is inevitable from the electrical potential relationship. The

operation of parasitic elements causes interference in circuit operation, and can lead to malfunction and destruction.

Therefore, be careful not to use it in a way which causes the parasitic elements to operate, such as by applying voltage

that is lower than the GND (P substrate) to the input terminal.

Resistor

Transistor (NPN)

B

Pin A

Pin B

C

E

Pin A

B

C

E

N

P⁺

N

P

Parasitic

element

N

Parasitic

element

P substrate

GND

Parasitic element

Other adjacent elements

Fig.18 Pattern Diagram of Parasitic Element

(13) Ground Wiring Patterns

When using both small signal and large current GND patterns, it is recommended to isolate the two ground patterns,

placing a single ground point at the application's reference point so that the pattern wiring resistance and voltage

variations caused by large currents do not cause variations in the small signal ground voltage. Be careful not to change the

GND wiring pattern potential of any external components, either.

(14) TEST Terminal

Be sure to connect TEST pin to GND.

15/16

●Selecting a model name when ordering

－

B

D

6

3

9

X

2

E

F

V

E

2

ROHM model

Part number

Package type

EFV=HTSSOP-B24

E2 = Reel-wound embossed taping

HTSSOP-B24

Tape

Embossed carrier tape

2000pcs

Quantity

7.8 0.1

+6

4

−4

E2

Direction

of feed

24

13

(The direction is the 1pin of product is at the upper left when you hold

reel on the left hand and you pull out the tape on the right hand)

+0.05

−0.03

1

12

0.17

0.08

0.325

S

0.65

+0.05

−0.04

0.2

M

0.08

Direction of feed

1pin

Reel

※When you order , please order in times the amount of package quantity.

(Unit:mm)


型号：	BD63922EFV-E2
厂家：	ROHM
描述：	Motion Control Electronic, BIPolar, PDSO24 光电二极管
文件：	总16页 (文件大小：1596K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

BD63922EFV-E2 [ROHM]

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