ROHM BD64550EFV Technical data

A

Motor Drivers for Printers

System Driver for Ink Jet Printers

BD64550EFV

No.10016EAT03

●Description

This is 1-chip system motor driver integrating 2-channel H-bridge driver, step-down switching regulator with built-in power DMOS, series regulator and reset output.

●Features

1) Low-on resistance output H-bridge driver (2-channel)

2) Constant-current chopping drive H-bridge driver

3) Switching regulator with built-in P-channel power DMOS FET

4) Soft start function: 23.6 ms (Typ.)

5) Reset release timer: 80 ms (Typ.)

6) 16 bit serial interface

7) Logic input interface (serial/parallel changeable)

8) Ultra thin type high heat dissipation HTSSOP-B40 package

9) Overcurrent protection in H-bridge driver block

10) Input voltage low voltage protection in H-bridge driver block

11) Overcurrent protection in switching regulator block

12) Output overvoltage protection in switching regulator block

13) Output low voltage protection in switching regulator block

14) Thermal shutdown

●Applications

Inkjet printer, photo printer, etc.

●Absolute Maximum Ratings (Ta=25℃)

Parameter Symbol Ratings Unit

VM applied voltage

Logic input voltage

RIN applied voltage

RNF voltage

Power dissipation

Operating temperature range

Storage temperature range

Junction temperature

Motor driver output current (peak 500 ns)

Motor driver output current (DC)

Switching regulator output current (DC)

Series regulator output current (DC)

* Reduced by 12.8 mW/℃ over 25 ℃, when mounted on a glass epoxy board (70 mm x 70 mm x 1.6 mm). ** Must not exceed Pd or ASO.

I

omax

I

VM

V

Pd

T

(peak)

omax

I

omax

I

omax

V

L

RIN

RNF

OPR

STG

jmax

(DC)

40 V

-0.4 ~ 5.5 V

5.5 V

0.5 V

1600* mW

-25 ~ +85 ℃

-55 ~ +150 ℃ 150 ℃

8.0 A

2.5** A

0.5 A

0.25 A

●Operating Conditions

Parameter Symbol Limit Unit

VM operating power supply voltage range VM 7 ~ 36 V

SCLK max. operating frequency F

Switching regulator output voltage range V

20 MHz

SCLK

3 ~ 5 V

swreg

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Technical Note

●Electrical Characteristics (Unless otherwise specified,Ta=25℃,VM=24V)

Parameter Symbol

Min. Typ. Max.

Limit

Unit Conditions

Overall

VM current 1 I

VM current 2 I

- - 8 mA VM=7V

VM1

- - 12 mA VM=24V

VM2

H-bridge 1

Output on resistance (source side)) R

Output on resistance (sinking side) R

Output leak current I

Built-in diode forward direction voltage (source side)

Built-in diode forward direction voltage (sinking side)

- 0.6 0.78 Ω Io=1A

ONH1

- 0.4 0.52 Ω Io=1A

ONL1

0 - 10 µA VM=36V

LEAK1

V

FH1

V

0.6 0.9 1.2 V Io=1A

FL1

0.6 0.9 1.2 V Io=1A

H-bridge 2

Output on resistance (source side) R

Output on resistance (sinking side) R

Output leak current I

Built-in diode forward direction voltage (source side)

Built-in diode forward direction voltage (sinking side)

- 0.7 0.91 Ω Io=1A

ONH2

- 0.5 0.65 Ω Io=1A

ONL2

0 - 10 µA VM=36V

LEAK2

V

FH2

V

0.6 0.9 1.2 V Io=1A

FL2

0.6 0.9 1.2 V Io=1A

Current control

VREF voltage range V

VREF pin outflow current I

RNF pin outflow current I

RNFS pin outflow current I

VREF-RNFS offset voltage V

0.8 - 3.5 V

REF

- 0 1 µA

REF

5 15 30 µA

RNF

- 0 1 µA

RNFS

OFFSET

-15 0 15 mV VREF=2V

Control logic

High input voltage V

Low input voltage V

2.0 - 5.5 V

INH

0 - 0.8 V

INL

Input current IIN 21 33 45 µA Input voltage=3.3V

Switching power source

DSEN threshold voltage V

Output on resistance R

Leak current I

DUTY_MAX value D

SWBIAS

SWON

SWLEAK

MAX

0.873 0.9 0.927 V

- 0.8 1.04 Ω At Io=250mA

0 - 10 µA VM=36V

- 92 - %

Clock frequency FSW 130 200 270 kHz

DSEN pin outflow current I

- 0 1 µA

DSEN

Series power source

Output voltage V

Leak current I

1.425 1.5 1.575 V At Io=70mA

SOUT

0 - 10 µA

SLEAK

RESET pin

Output voltage V

Leak current I

High VM threshold voltage V

Low VM threshold voltage V

High motor UVLO voltage V

Low motor UVLO voltage V

Reset delay time T

0 - 0.2 V I

RSTL

RSTLEAK

MPORH

MPORL

13.5 15 16.5 V Off motor only

MMTH

12.5 14 15.5 V

MMTL

50 80 110 ms

POR

0 - 10 µA

6.3 6.5 6.7 V VM at power on

5.9 6.1 6.3 V VM at power off

DRAIN

=1mA

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Technical Note

●Reference Data

6

25℃

85℃

8.00

1.2

4

2

Ci rcui t current :Ic c[m A]

-25℃

6.00

4.00

CLK8M [MHz]

2.00

0.8

Vref [V]

0.4

0

0 8 16 24 32

Supply voltag e :VM[ V]

0.00

-25 0 25 50 75

Temper ature [℃ ]

0.0

-25 0 25 50 75 Temper atur e (℃)

Fig.1 VM Current Fig.2 Internal Reference Clock

1.4

1.2

1.0

0.8

85

℃

25

℃

0.6

0.4

Output H voltage :VO H[V ]

0.2

0.0 0 400 800 1200 1600 2000

Supply curr ent :Io[mA]

-25

Fig.4 OUT1 High Output Voltage

(source side)

(VM=24V)

0.9

0.8

0.7

0.6

0.5

℃

0.4

0.3

Output L v oltage :VOL[V]

0.2

0.1

0.0 0 400 800 1200 1600 2000

25

℃

Supply cur rent :Io[mA]

85

℃

-25

℃

Fig.5 OUT1 Low Output Voltage

(sinking side)

Fig.3 Temperature dependence of

Internal Standard Voltage (VM=24V)

1.6

1.4

1.2

1.0

0.8

0.6

0.4

Output H voltage :VOH[ V]

0.2

0.0 0 400 800 1200 1600 2000

Supply curr ent :Io[mA]

85

℃

25

℃

-25

℃

Fig.6 OUT2 High Output Voltage

(source side)

1.4

1.2

1.0

0.8

0.6

0.4

Output L v olt age :VOL[V]

0.2

0.0 0 400 800 1200 1600 2000

Supply cur rent :Io[ mA]

85

25

℃

Fig.7 OUT2 Low Output Voltage

(sinking side)

-25

500

400

85

℃

300

200

Swout vol tage :R sw[m V

100

0

0 100 200 300 400 500

Supply cur rent :Io[ mA]

℃

2

℃

-25

℃

Fig.8 Switching Regulator High Output

Voltage

100

80

60

40

Output effect:[%]

20

0

0 100 200 300 400 500

Output current :[mA]

VM= 7V

VM =24V

Fig.9 Switching Regulator Efficiency

(Ta=25℃)

2.0

1.8

1.6

1.4

Rout v oltage:[V]

1.2

1.0 0 50 100 150 200 250

Supply cur rent :[mA]

Fig.10 Series Regulator Load Regulation

(VM=24V, Ta=25℃)

4

3

2

1

Swout vol tage :SV[ mV]

0

02468

Supply v oltage :VM[V]

-25

25

℃

85

℃

Fig.11 Reset Output

(Pull up to switching regulator at 10kΩ)

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Technical Note

●Block Diagram, Application Circuit Diagram, and Pin Function

0.2Ω

(0.04~0.35Ω)

Same as RNF1

STROBE(DC1E

From VDCDCOUT

(0.1µF~2.2µF)

VM2

OUT2P

OUT2M

RNF2

RNF2S VREF2

SELECT

DC2P

SCLK(DC1P)

DC2E

SDAT

GND

RIN

ROUT

1µF

VM1

1/10

8

9

7

2

3

4 5

20

31

28

40

21

10

12

18

VM1

OUT1P

OUT1M

RNF1

RNF1S VREF1

VM3

RESET

PGND

DGND

VM4

SWOUT

220µH

100µF

DSEN

0.2Ω (0.04Ω~0.35Ω)

300µF (220µF~470µF)

VDCDCOUT

2.7kΩ

4700pF

1kΩ

32

33

39

34

37

38

36

1/10

19

22

24

27

Selector

23

25

)

26

29

16

14

Pre

driver

CONTROL LOGIC

Serial

Control

BG BG

Pre

driver

POWER

MONITOR

RESET

BGTSD UVLOOSC

DRIVER REG

Be sure to use VM1,VM2.VM3 and VM4 by short-circuit.

0.2Ω(0.04Ω~0.35Ω) Io1=(VREF1/10)・(1/RNF1S) See P.9.

N.C.

1

OUT1M

2

RNF1

3

RNF1

4

RNF1S

5

N.C.

6

OUT1P

7

8

VM1

9

VM4

10

N.C.

11

SWOUT

12

N.C.

13

ROUT

14

N.C.

15

RIN

16

N.C.

17

DSEN

18

VREF2

19

VREF1

20

The figure on the left-hand side shows optimum recommended values. See P.10 for setting.

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

Fig.12 Block Diagram and Application Circuit Diagram Fig.13 Pin Assignment Diagram

No.

name

Function No.

name

Function

1 NC Non Connection 21 DGND Digital GND

2 OUT1M H-bridge output pin 1M 22 SELECT Input pin select pin

3 RNF1 Output current detection pin 1 23 DC2E H-bridge 2 side enable input pin

4 RNF1 Output current detection pin 1 24 DC2P H-bridge 2 side phase pin

5 RNF1S Output current detection input pin

6 NC Non Connection

25 STROBE

Serial port strobe input pin / H-bridge 1 side enable pin

7 OUT1P H-bridge output pin 1P 26 SDATA Serial port data input pin

8 VM1 Motor power supply pin

9 VM1 Motor power supply pin

27 SCLK

Serial port clock input pin / H-bridge 1 side phase input pin

10 VM4 Switching regulator power supply pin 28 RESET Reset signal output pin

11 NC Non Connection 29 AGND ANALOG GND

12 SWOUT Switching regulator output pin 30 NC Non Connection

13 NC Non Connection 31 VM3 Power supply pin

14 ROUT Series regulator output pin 32 VM2 Motor power supply pin

15 NC Non Connection 33 VM2 Motor power supply pin

16 RIN Series regulator power supply pin 34 OUT2M H-bridge output pin 2M

17 NC Non Connection 35 NC Non Connection

18 DSEN Switching regulator voltage sense pin 36 RNF2S Output current detection input pin

19 VREF2 Reference voltage input pin 37 RNF2 Output current detection pin 2

20 VREF1 Reference voltage input pin 38 RNF2 Output current detection pin 2

39 OUT2P H-bridge output pin 2P

40 PGND POWER GND

* Precaution regarding VM pin If you use VM1, VM2, VM3 and VM4 not by short-circuit, they may be destroyed. Be sure to use them by short-circuit. And be sure to set up a bypass capacitor (220µF to 470µF) closer to VM3 pin as much as possible.

PGND

OUT2P

RNF2

RNF2S

N.C.

OUT2M

VM2

VM3

N.C.

AGND

RESET

SCLK

SDATA

STROBE

DC2P

DC2E

SELECT

DGND

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●Pin selection function

Either serial control or external PWM control can be selected for motor control type with SELECT pin (pin 22).

SELECT Output state

L Serial input mode

H External PWM control mode

STROBE/DC1E(25pin)

SDATA(26pin)

SCLK/DC1P(27pin)

DC2P(24pin)

DC2E(23pin)

ENA PHA

Internal shift register

SEL

Serial

SEL

Serial

SEL

Serial

SELECT(22pin)

Fig.14 Serial Input Block Diagram

The input/output logic at SELECT = H is as follows.

DC1E/DC2E Output state

L Open

H ACTIVE

DC1P/DC2P OUTP OUTM

L SINK SOURCE

H SOURCE SINK

○Procedure of DC motor drive by external PWM control

1) Serial setting Set the serial by SELECT pin = L. (WORD_S and WORD_D setting)

・WORD_S (see P.7) is a drive parameter for setting OFF_TIME, BLANK TIME etc. ・WORD_D (see P.7) is for drive setting to set drive mode of each H-bridge.

When setting WORD_D (see P.7), make sure that ENABLE signal (ENABLE_1､ENABLE_2) of serial bit is L. If ENABLE signal is H, the motor may operate. Input of DC2P pin can be either H or L.

2) External PWM drive mode switch Set external PWM drive mode by SELECT pin = H. Switch by DC1E (STROBE)/CD2E pin = L when switching SELECT pin.

3) Drive PHASE, ENABLE pin input signal (DC1E/DC1P/DC2E/DC2P) drives in external PWM mode.

Technical Note

OUTPUT

Control

Logic

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Technical Note

●Serial interface

16-bit 3-linear type serial interface (SDATA (pin 26), SCLK (pin 27), STROBE (pin 25)) is provided to set the operation and the value of current limit. Data are sent to the internal shift register by falling edge of SCLK pin in the area L of STROBE pin. Data of shift register are written in an appropriate address of internal memory of 2*15 bits by rising edge of STROBE pin according to address data of D15.The input order of serial data is from D0 to D15.

Address data

D15 Word select

0 WORD_S

1 WORD_D

Memory data allocation

BIT WORD_S Default WORD_D Default

D0 Rohm_Reserve[2] 0 Rohm_Reserve[11] 0

D1 Rohm_Reserve[1] 0 Rohm_Reserve[10] 0

D2 Rohm_Reserve[0] 0 Rohm_Reserve[9] 0

D3 OFF TIME_2[2] 0 Rohm_Reserve[8] 0

D4 OFF TIME_2[1] 0 Rohm_Reserve[7] 0

D5 OFF TIME_2[0] 0 Rohm_Reserve[6] 0

D6 BLANK TIME_2[1] 0 Rohm_Reserve[5] 0

D7 BLANK TIME_2[0] 0 Rohm_Reserve[4] 0

D8 OFF TIME_1[2] 0 Rohm_Reserve[3] 0

D9 OFF TIME_1[1] 0 PWM_MODE_2 0

D10 OFF TIME_1[0] 0 S_PHASE_2 0

D11 BLANK TIME_1[1] 0 S_ENABLE_2 0

D12 BLANK TIME_1[0] 0 PWM_MODE_1 0

D13 MASK SELECT 0 S_PHASE_1 0

D14 SWOFF 0 S_ENABLE_1 0

The timing of serial report writing is shown in the right figure. And the minimum timing of each is as follows:

A：SDATA setup time･･･････････････････ 10nsec B：SDATA hold time････････････････････ 10nsec C：Setup STROBE to SCLK falling edge･･ 50nsec D：SCLK low pulse width････････････････ 25nsec E：SCLK High pulse width･･･････････････ 25nsec F：Setup SCLK falling edge to STROBE･･･ 25nsec G：STROBE pulse width････････････････ 50nsec H：Setup RESET to SCLK Rising･････････ 50µsec

H

RESET

STROBE

SCLK

B

D0

D1

D15

CGF E D

○RESET signal is an internal RESET signal and generated inside IC at the same timing of external RESET output. ○STROBE, SCLK and SDATA signals are input signals through external ASIC.

Fig.15 Serial Signal Input Timing

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