Motor Drivers for Printers
Three-phase Brushless Motor Driver
for Polygonal Mirrors [For LBP, PPC]
BD67929EFV
No.10016EAT05
●Description
BD67929EFV is a 3-phase brushless motor driver for polygon mirror motors of direct PWM drive type built-in PLL ensuring.
As for its basic function, it is a 3-phase 120°energization direct PWM drive type with power supply rated voltage of 36V
and rated output current 2.3A. It is useful for high speed drive. It has the P-MOS and D-MOS on the output block, and the
output ON Resistance is very low 1.35Ω(Typ.). It is very useful for low power consumption. And this IC is high reliability due
to built-in each protection functions (thermal protection, over current protection, restricted protection circuit).
●Features
1) 3-Phase MOS120°energization, direct PWM drive type
2) High output current: 2.5A
3) Low ON resistance DMOS output
4) PLL control circuit
5) Phase lock detection circuit
6) Current limiting circuit
7) 5V regulator output
8) Power-saving function (SS)
9) Short brake function (SB)
10) Built-in logic input pull-up resistor
11) Restricted protection circuit
12) CLK un-input protection circuit
13) CLK input baffler chattering circuit
14) Over current protection circuit (OCP)
15) Thermal shutdown circuit (TSD)
16) Over voltage lock out circuit (OVLO)
17) Under voltage lock out circuit (UVLO)
18) Electrostatic discharge: 8kV (HBM standard)
●Applications
Laser beam printer, PPC, etc.
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1/14
2010.12 - Rev.A
Technical Note
BD67929EFV
●Absolute maximum ratings (Ta=25℃)
Parameter
Symbol
Ratings
Unit
VCC
-0.2～+36.0
V
VLD, FG
-0.2～+6.5
V
VHB
-0.2～+6.5
V
Input voltage of Hall signal
VHALL
-0.2～+6.5
V
Input voltage of CLK
VCLK
-0.2～+6.5
V
VIN
-0.2～+6.5
V
Supply voltage
Applied voltage of LD, FG terminal
Applied voltage of HB terminal
Input voltage of control pin (SS, SBE)
Power dissipation
*1
W
*2
W
*3
mA
1.45
Pd
4.70
Output current
IOUT
Operating temperature range
Topr
-25～+85
℃
Storage temperature range
Tstr
-55～+150
℃
Tjmax
150
℃
Junction temperature
*1
*2
*3
2500
70mm×70mm×1.6mm glass epoxy board. Derating in done at 11.6mW/℃ for operating above Ta=25℃
Mounting on 4-layer board. Derating in done at 37.6mW/℃ for operating above Ta=25℃.
Do not, however exceed Pd, ASO and Tlmax=150℃.
●Operating conditions (Ta=-25～85℃)
Parameter
Symbol
Ratings
Min.
Typ.
Max.
Unit
Supply voltage
VCC
19
24
28
V
Output current of 5V regulator
IREG
-20
-
0
mA
Input current of HB terminal
IHB
0
-
20
mA
Applied voltage of LD, FG terminal
VLD, FG
0
-
5.5
V
Output current of LD, FG terminal
ILD, FG
0
-
15
mA
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2/14
2010.12 - Rev.A
Technical Note
BD67929EFV
●Electrical characteristics (Unless otherwise specified, Ta=25℃, VCC=24V)
Parameter
Symbol
Limits
Min.
Typ.
Max.
Unit
Conditions
Whole
Circuit current 1
ICC1
-
4.0
9.0
mA
SS=L, Output is ON
Circuit current 2
ICC2
-
1.0
2.3
mA
SS=H, Output is OFF
VREG
4.65
5.00
5.35
V
Output ON resistance
RON
-
1.35
1.76
Ω
IOUT =1.0A on high and low side
Forward voltage of Diode on low side
VD1
0.70
1.10
1.55
V
IOUT =-1.0A
Forward voltage of Diode on high side
VD2
0.70
1.10
1.55
V
IOUT =1.0A
Output leak current
ILEAK
-
-
10
µA
VREG output
Output voltage
Driver block (U, V, W)
in total
Hall comparator (HUP, HUN, HVP, HVN, HWP, HWN)
In-phase input voltage range
VICM
1.5
-
3.5
V
Hysteresis voltage
ΔVIN
15
24
42
mV
High and low side in total
VOD
-
0.15
0.50
V
High output voltage
VPDH
4.5
4.9
-
V
IPD =-100µA
Low output voltage
VPDL
-
0.2
0.3
V
IPD =100µA
High output voltage of EO
VERH
3.5
4.1
-
V
IEO =-500µA
Low output voltage of EO
VERL
-
0.9
1.5
V
IEO =500µA
IEi
-2.0
-0.1
-
µA
VEi =0V
GH
1.2
1.5
1.8
times
LD, FG output
Low output voltage
ILD,FG =10mA
PD output
Integral Amplifier
Input current of EI
Current limiting circuit
Gain at start up
Gain at steady state
GL
0.4
0.5
0.6
times
VRNF
0.45
0.50
0.55
V
External input frequency
FCLK
-
-
10
kHz
High level input voltage
VCLKH
3.0
-
-
V
Low level input voltage
VCLKL
-
-
1.5
V
Low level input current
ICLKL
-75
-50
-25
µA
High level input voltage
VINH
3.0
-
-
V
Low level input voltage
VINL
-
-
1.5
V
Low level input current
IINL
-75
-50
-25
µA
VIN =0V
Oscillating frequency
FOSC
130
200
270
kHz
COSC =220pF
High triangular waveform voltage
VOSCH
1.6
2.0
2.4
V
Low triangular waveform voltage
VOSCL
1.2
1.5
1.8
V
TPCLK
13
20
27
msec
VHB
0.65
0.80
0.95
V
Limit voltage
CLK input
VCLK =0V
Control input(SS, SB)
Oscillator
PROCLK
CLK cycle for protection circuit
CPCLK =0.1µF
Hall bias
Hall bias voltage
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3/14
IHB =10mA
2010.12 - Rev.A
Technical Note
BD67929EFV
●Pin function
Pin No Pin name
Function
Pin No Pin name
Function
1
GND
Ground
15
HUP
2
VCC
Power supply terminal
16
VREG
3
FG
FG output terminal
17
PD
4
CS
18
TEST
5
RNF
19
EI
Error amplifier input terminal
6
W
Output terminal
20
EO
Error amplifier output terminal
7
V
Output terminal
21
PROCLK
Connection terminal of a capacitor
to set the clock cycle for protection
8
U
Output terminal
22
CLK
Speed control clock input terminal
9
HB
Bias terminal for Hall element
23
SS
10
HWN
Hall signal input terminal
24
11
HWP
Hall signal input terminal
25
12
HVN
Hall signal input terminal
26
13
HVP
Hall signal input terminal
27
14
HUN
Hall signal input terminal
28
Current detection comparator
input terminal
Connection terminal of resistor
for output current detection
Hall signal input terminal
5V regulator output terminal
Phase comparison output terminal
Testing terminal
Start/stop signal input terminal
Phase locked detection
output terminal
Connection terminal of capacitor
OSC
to set PWM oscillating frequency
Switch terminal of deceleration
BRMODE
mode in servo
Connection terminal of
CNF
capacitor for current sense amp
LD
SB
Short brake signal input terminal
●Block diagram & Application circuit diagram
Capacitor for noise to
Hall signal.
Setting range is
0.01～0.1µF.
HUP
10nF
HUN
HVP
10nF
HVN
HWP
10nF
Resistor and capacitor
for PLL control.
HWN
15
2
HALL
HYS
COMP
13
12
0.01µF 100µF
LOGIC
8
7
11
6
10
5
EI
EO
33pF
OSC
V
Ｍ
W
Resistor to detect the
Motor current.
Setting range is
0.25Ω～1.00Ω.
RNF
0.33
19
24
20
3
HALL BIAS
9
LD
FG
Resistor to set output
signal level of Hall
element.
HB
27
25
4
PWM
Capacitor to set
the PWM frequency.
U
Bypass capacitor.
Setting range is
47µF～470µF
(electrolytic)
0.01µF～0.1µF
(multilayer ceramic etc.)
17
Capacitor for
compensation of
current feedback roop.
CNF
VCC
14
CLK 22
PD
VCC
BRMODE 26
18
TSD
Regulator
16
PRO_OSC
21
CS
1K
330pF
TEST
Resistor and Capacitor
is to reduce the noise
of CR terminal.
VREG
0.1µF
SB 28
OCP
OVLO
SS 23
RESET
UVLO
1
PROCLK
0.1µF
GND
Capacitor for
internal Regulator and
regulator for Hall element.
Capacitor to set the detection time for
protection circuit. Setting range is
0.01µF～0.47µF.
Block diagram & Application circuit diagram
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4/14
2010.12 - Rev.A
Technical Note
BD67929EFV
●Terminal function
○HWP, HVP, HUP, HWN, HVN, HUN/Hall signal input terminal
These terminals are the input terminals of the output signals from Hall elements. This has the comparator with hysteresis.
The width of hysteresis voltage is ±12mV(Typ.). The output of this comparator will be high if the voltage of HxP terminal
is greater than the voltage of HxN terminal by 12mV, and the level will be low if the voltage of HxP terminal is less than
the voltage of HxN terminal by 12mV. For the countermeasures against noise interface with Hall inputs, the connection of
a capacitor with a capacitance of approximately 0.01 - 0.1µF between HxP terminal and HxN terminal.
○PD/Phase comparison output terminal
This terminal outputs the signal that is the comparison of FG signal and CLK signal.
○EI/Error amplifier input terminal
This terminal is the input terminal of the error amplifier.
○EO/Error amplifier output terminal
This terminal is the output terminal of the error amplifier. It is connected to the input terminal of motor torque command
signal inside the IC.
○CLK/Speed control clock input terminal
This terminal is the CLK signal input terminal to control the speed. This terminal has the 100kΩ resistor which is
pulled-up to the internal regulator. This block detect the falling edge. In case that there is the noise on the CLK signal, it
makes the miscount of the CLK signal. Be sure to design the pattern without the influence of the noise.
○SS/Start/Stop signal input terminal
This terminal makes the motor start or stop.
This terminal has the 100kΩ resistor which is pulled-up to the internal regulator.
SS
LO
HI
start
stop
When SS=HI, IC becomes stop condition. Stop condition is Free Run or Short Brake that decided by SB terminal.
Moreover, it makes the HB terminal off, and shut down the current to the Hall element. It is very useful to low power
consumption.
○LD/Phase locked detection output terminal
When the rotation count of the motor is within 10% of the target rotation count, the LD terminal becomes LO.
This terminal is open drain type output, please connect to the external regulator (0～5.5V recommended) through the
resistor. The capability of this terminal is 15mA maximum, please set the voltage of the external regulator and the value of
resistor to be within 15mA.
○OSC/Connection terminal of capacitor to set PWM oscillating frequency
This terminal is the connection terminal of capacitor to make the triangle waveform that set the PWM frequency.
fPWM = 44µ / C [Hz]
ex.) when C=220pF, f=200〔kHz〕
○CNF/Connection terminal of capacitor of Current Sense Amp.
This terminal is the connection terminal of capacitor to compensate the phase of CS Amplifier.
○SB/Short brake signal input terminal
This terminal is the input signal terminal that set output condition when the voltage of SS is HI. This terminal has the
100kΩ resistor which is pulled-up to the internal regulator. When the voltage of SB terminal turns to LO, all low side
MOS FET turns to ON, and it should be short brake condition. It is very useful to reduce the speed quickly.
SB
stop mode
LO
HI
Short brake mode
Free run mode
○BRMODE/PLL brake setting terminal
This IC has the two kinds of deceleration method. The method is configurable by which terminal to connect with
BRMODE, VREG or GND terminal. This terminal has the 100kΩ resistor which is pulled-up to the internal regulator.
BRMODE
deceleration method
GND
VREG
short brake
free run
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5/14
2010.12 - Rev.A
Technical Note
BD67929EFV
○VREG/5V regulator output terminal
This terminal is the connection terminal of capacitor to stabilize the 5V output of internal regulator. It should be connected
with the capacitor (0.01µF-1µF) to the ground. This terminal is used as the regulator to the Hall element too. The road
current should be within 20mA.
○PROCLK/Connection terminal of a capacitor to set the clock cycle for protection
This terminal is the connection terminal of capacitor to set the time of detection.
The period of PROCLK=C×200k[s]
ex.) when C=0.1µF, The period of PROCLK=20m[s]
○HB/Bias terminal for Hall element
This terminal is the open collector type, and low side switch. By connecting the GND side of Hall element to the HB, the
bias current of the Hall element will be turned off with the SS set to high or open. It is very useful for the low power
consumption because the bias current for Hall element will be 0µA.
○FG/FG output terminal
This terminal outputs the signal which indicate the rotation count, which is synthesize from Hall signal of U-phase.
This terminal is open drain type output, it should be pulled-up to the external regulator (0-5.5V) through the resistor.
The capability of FG terminal is 15mA maximum, please set the voltage of external regulator and the value of resistor to
be within 15mA.
HUP
HUN
Hall signal
FG
○CS/Current detection comparator input terminal
In this IC, CS terminal, which is the input terminal of current limit comparator, is independently arranged in order to
decrease the lowering of current-detecting accuracy caused by the wire impedance inside the IC of RNF terminal.
Therefore, please be sure to connect RNF terminal and CS terminal together when using in the case of PWM constant
current control. In addition, because the wires from CS terminal is connected near the current-detecting resistor in the
case of interconnection, the lowering of current-detecting accuracy, which is caused by the impedance of board pattern
between RNF terminal and the current-detecting resistor, can be decreased. Moreover, please design the pattern in such
a way that there is no noise plunging. In addition, please be careful because if terminal of RNF is shorted to GND, large
current flows without normal PWM constant current control and, then there is danger that OCP or TSD will operate.
To reduce the PWM noise influence, please out the filter between RNF terminal and CS terminal.
CS
R1
C1
The cut-off frequency is below
f = 1 / (2π×R1×C1)
ex.) when C1=330pF, R1=1kHz
RNF
RRNF
f=483[kHz]
○U, V, W/Output terminal
Motor's drive current is flowing in it, so please wires in such a way that the wire is thick & short has low impedance. It is
also effective to add a Shot-key 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 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 even destruction, so please be sure
that the maximum absolute rating must not be exceeded.
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6/14
2010.12 - Rev.A
Technical Note
BD67929EFV
○GND/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.
○VCC/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 47µF～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. 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 if reverse voltage is applied between VCC terminal
and GND terminal, so please be careful.
○RNF/Connection terminal of resistor for detecting of output current
Please connect the resistor of 0.25Ω～1.00Ω for current detection between this terminal and GND. In view of the power
consumption of the current-detecting resistor, please determine the resistor in such a way that W=IOUT2・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 (0.7V). 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.
○IC back side metal/Metal for heat-radiation
For HTSSOP-B28 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 21 cannot 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.
○TEST terminal/Terminal for testing
This is the terminal used at the time of shipping test. Please connect to GND. Please be careful because there is a
possibility of malfunction if GND unconnected.
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7/14
2010.12 - Rev.A
Technical Note
BD67929EFV
●Servo and PLL
This IC synchronizes the phase of the reference CLK signal and the internal three-phase synthesized FG in motor RPM
control. In the control system, the rising of the FG signal and the falling of CLK signal are monitored and the phase
comparison of the two signals is made. The output signal after the phase comparison is smoothed by the active filter with
the above INT amplifier used to determine the torque of the motor. The motor rotates at the torque determined here and the
FG signal is generated. The motor rotates at the number of revolutions according the CLK, and the IC goes into servo
mode.
●Input and output condition table
Hall input
Output
Pin No.
15
13
11
8
Pin Name
HUP
HVP
HWP
L
H
H
Condition 1
FG logic
7
6
3
U
V
W
FG
L
H
M
L
Condition 2
L
L
H
L
M
H
L
Condition 3
H
L
H
M
L
H
H
Condition 4
H
L
L
H
L
M
H
Condition 5
H
H
L
H
M
L
H
Condition 6
L
H
L
M
H
L
L
HUN(35pin)= HVN(33pin)= HWN(31pin)= M
●Timing Chart
HUP
HUN
HVN
HVP
HWP
HWN
U
V
W
FG
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8/14
2010.12 - Rev.A
Technical Note
BD67929EFV
●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 pr 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 SS 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 Tjmax=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 does 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 SS=HI 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 33V (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 SS=HI mode.
○Restricted protection circuit
This IC has a built-in restricted protection circuit for the provision against restriction of the motor. This circuit sets PD to H
for decreasing the torque when FG signal does not change over for certain time. It returns by re-charging the power
supply or resetting by SS terminal. The length of the time for detecting the motor lock will be able to set by the value of
the capacitor which is connected to PROCLK terminal.
When motor is locked by some reason, Pd is changed to H and the motor torque is decreased. The time that is until
detecting the lock is set by the value of capacitor which is connected to PROCLK terminal.
The period of PROCLK
= C×200k[s]
The detecting time to lock
= the period of PROCLK×96 count
= C×200k[s]×96 count
ex.) When C=0.1µF, T= 1.92 [s]. The declination of 1 count may occur by the timing of the count.
○Non input CLK protection circuit
This IC has a built-in non input CLK protection circuit for the provision against breaking of CLK. This circuit sets the motor
output open when CLK signal does not change over for certain time. It returns by re-changing the power supply or
resetting by SS terminal. The length of the time for detecting the state of non input CLK will be able to set by the value of
the capacitor which is connected to PROCLK terminal.
The period of PROCLK
= C×200k[s]
The detecting time to lock T
= The period of PROCLK×3count
= C×200k[s]×3count
ex.) When C=0.1µF, T= 80 [ms]. The declination of 1 count may occur by the timing of the count.
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9/14
2010.12 - Rev.A
Technical Note
BD67929EFV
●Power Consumption
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 is exceeded 150℃, 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. Tjmax=150℃ must be strictly obeyed under all circumstances.
○Thermal Calculation
The IC's consumed power can be estimated roughly with the power supply voltage (VCC), circuit current (ICC),
output ON resistance (RONH, RONL) and motor output current value (IOUT).
Consumed power of the Vcc [W] = VCC [V] × ICC [A] ･･･････①
Consumed power of the output DMOS [W] = (RONH + RONL)×IOUT2×on_duty +{RONL×IOUT2+DIVL×IOUT}(1-on_duty) ･･･②
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.
tchop is the period of chopping which is set by the external capacitor of OSC terminal. See page 5 for detail.
High side Pch DMOS ON Resistance RONH [Ω] (typ.)= 0.70 [Ω]
Low side Nch DMOS ON Resistance RONL [Ω] (typ.)= 0.65 [Ω]
Consumed power of total IC W_total[W] = ① + ②
Junction temperature Tj = Ta[℃] + θja[℃/W]･W_total [W]
However, the thermal resistance valueθja [℃/W] differs greatly depending on circuit board conditions. Refer to the
derating curve on P.10. Also, we are taking measurements of thermal resistance valueθja of 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 Tjmax=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.
○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 VCC to the IC. This measurement is of the Vf voltage inside the diode.
(2) Measure the temperature characteristics of this terminal voltage. (Vf has a linear negative temperature may be
calibrated from the TEST terminal voltage.
(3) Supply VCC, confirm the TEST terminal voltage while running the motor, and the chip temperature can be
approximated from the results of (2).
VCC
-Vf[mV]
Circuitry
TEST
Idiode
Circuitry
V
25
150
Tj[℃]
Model diagram for measuring chip temperature
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© 2010 ROHM Co., Ltd. All rights reserved.
10/14
2010.12 - Rev.A
Technical Note
BD67929EFV
●Power Dissipation
○HTSSOP-B28 Package
HTSSOP-B28 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.
5.0
4.70W
Measurement machine：TH156(Kuwano Electric)
Measurement condition：ROHM board
3
Board size：70*70*1.6mm
(With through holes on the board)
4
4.0
Power Dissipation：Pd[W]
3.30W
2
Board①：1-layer board(Copper foil on the back 0mm )
2
Board②：2-layer board(Copper foil on the back 15*15mm )
2
Board③：2-layer board(Copper foil on the back 70*70mm )
2
Board④：4-layer board(Copper foil on the back 70*70mm )
3
3.0
2.0
1.0
1.85W
1.45W
Board①：θja=86.2℃/W
Board②：θja=67.6℃/W
Board③：θja=37.9℃/W
Board④：θja=26.6℃/W
2
1
0
100
125
Ambient Temperature:Ta[℃]
HTSSOP-B28 Derating Curve
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© 2010 ROHM Co., Ltd. All rights reserved.
11/14
2010.12 - Rev.A
Technical Note
BD67929EFV
●Notes for use
(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 have sufficient current absorption capacity, regenerative current will cause the voltage on the power supply
line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. It is
recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power
supply and GND pins.
(4) GND Potential
The potential of GND pin must be minimum potential in all operating conditions.
(5) Metal on the back side (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.
This IC is equipped with FIN heat dissipation terminals, but dissipation efficiency can be improved by applying heat
dissipation treatment in this area. It is important to consider actual usage conditions and to take as large a dissipation
pattern as possible.
(7) Inter-pin shorts and mounting errors
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.
(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 Tjmax=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 [℃]
175
(Typ.)
25
(11) Inspection of the application board
During inspection pf 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.
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© 2010 ROHM Co., Ltd. All rights reserved.
12/14
2010.12 - Rev.A
Technical Note
BD67929EFV
(12) Input terminal of IC
This IC is a monolithic IC, and between each element there is a P+ isolation foe 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,
○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)
Pin A
Pin B
C
Pin B
B
Pin A
N
P+
N
P+
P
N
E
Parasitic
element
N
P+
N
P substrate
Parasitic element
GND
P+
P
B
N
C
E
P substrate
Parasitic element
GND
GND
GND
Parasitic
element
Other adjacent elements
Pattern Diagram of Parasitic Element
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© 2010 ROHM Co., Ltd. All rights reserved.
13/14
2010.12 - Rev.A
Technical Note
BD67929EFV
●Ordering part number
B
D
6
Part No.
7
9
2
9
E
Part No.
F
V
Package
EFV: HTSSOP-B28
-
E
2
Packaging and forming specification
E2: Embossed tape and reel
(HTSSOP-B28)
HTSSOP-B28
<Tape and Reel information>
9.7±0.1
(MAX 10.05 include BURR)
(5.5)
1
Tape
Embossed carrier tape (with dry pack)
Quantity
2500pcs
Direction
of feed
E2
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
)
14
+0.05
0.17 -0.03
1PIN MARK
1.0MAX
0.625
1.0±0.2
(2.9)
0.5±0.15
15
4.4±0.1
6.4±0.2
28
+6°
4° −4°
0.08±0.05
0.85±0.05
S
0.08 S
0.65
+0.05
0.24 -0.04
0.08
1pin
M
(Unit : mm)
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© 2010 ROHM Co., Ltd. All rights reserved.
Reel
14/14
Direction of feed
∗ Order quantity needs to be multiple of the minimum quantity.
2010.12 - Rev.A
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.
The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any
of the Products for the above special purposes. If a Product is intended to be used for any
such special purpose, please contact a ROHM sales representative before purchasing.
If you intend to export or ship overseas any Product or technology specified herein that may
be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to
obtain a license or permit under the Law.
Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact us.
ROHM Customer Support System
http://www.rohm.com/contact/
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© 2010 ROHM Co., Ltd. All rights reserved.
R1010A