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Número de pieza | BD64550EFV | |
Descripción | System Driver | |
Fabricantes | ROHM Semiconductor | |
Logotipo | ||
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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
VM 40
Logic input voltage
VL -0.4 ~ 5.5
RIN applied voltage
VRIN
5.5
RNF voltage
VRNF
0.5
Power dissipation
Pd 1600*
Operating temperature range
Storage temperature range
Junction temperature
TOPR
TSTG
Tjmax
-25 ~ +85
-55 ~ +150
150
Motor driver output current (peak 500 ns)
Iomax (peak)
8.0
Motor driver output current (DC)
Iomax (DC)
2.5**
Switching regulator output current (DC)
Iomax
0.5
Series regulator output current (DC)
Iomax
0.25
* 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.
V
V
V
V
mW
℃
℃
℃
A
A
A
A
●Operating Conditions
Parameter
Symbol
Limit
Unit
VM operating power supply voltage range
SCLK max. operating frequency
Switching regulator output voltage range
VM
FSCLK
Vswreg
7 ~ 36
20
3~5
V
MHz
V
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© 2010 ROHM Co., Ltd. All rights reserved.
1/16
2010.06 - Rev.A
1 page BD64550EFV
Technical Note
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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)
SELECT(22pin)
ENA PHA
Internal shift register
SEL
SEL
Serial
SEL
Serial
SEL
Serial
Fig.14 Serial Input Block Diagram
The input/output logic at SELECT = H is as follows.
DC1E/DC2E
L
H
Output state
Open
ACTIVE
DC1P/DC2P
L
H
OUTP
SINK
SOURCE
OUTM
SOURCE
SINK
Control
Logic
OUTPUT
○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.
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© 2010 ROHM Co., Ltd. All rights reserved.
5/16
2010.06 - Rev.A
5 Page BD64550EFV
●Protection function
○Protection circuit function
Overall
DC motor drive circuit
Switching regulator circuit
Series regulator circuit
Technical Note
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Overheating protection
Overcurrent protection
Overcurrent protection, output overvoltage protection, output low voltage protection
None
○Operation at protection circuit operation
①Overheating protection・・・All functions are shutout along with junction temperature rise
Thermal shutdown temperature
175℃(typ.)
Switching regulator
At protection operation
OFF
Series regulator
OFF
DC motor
OFF
RESET
L
Re-start
Again power-on
②Overcurrent protection (Switching regulator)
Set current
ISWOC
2.6(A)
Operating
Switching regulator
OFF
Mask time
0.5µsec(※)
Series regulator
OFF
State after operation
All function shutout
DC motor
OFF
RESET
L
Re-start
Again power-on
③Overcurrent protection (DC motor)
Set current
IDCOC
3.8(A)
Operating
Switching regulator
ON
Mask time
1.5µsec
Series regulator
ON
State after operation
Shown below
DC motor RESET
OFF
L_PULSE
Re-start
Serial re-input
Motor current
RESET signal
IDCOC setting value
L
Serial data
Data default
1.5μsec 40msec
Fig.26 Timing Chart of Motor Overcurrent Protection
(※) If the output pulse of switching regulator is 0.5µs or below, the overcurrent function does not operate even at the time of overcurrent outflow.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/16
2010.06 - Rev.A
11 Page |
Páginas | Total 17 Páginas | |
PDF Descargar | [ Datasheet BD64550EFV.PDF ] |
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