1/5
Structure
Product Name
:
:
Silicon Monolithic Integrated Circuit
Power Driver For DVD Players
Device Name
:
BA5956FM
Features
:
• 2CHs for current driving-type BTL drivers to drive two-axis actuators
1CH for a voltage driving-type BTL driver for a feed motor
1CH for a voltage driving-type BTL driver for a loading motor
1CH for a voltage driving-type BTL driver for a spindle motor
• Use of the HSOP-M36 power package achieves downsizing of the set.
• A wide dynamic range
• A built-in thermal shutdown circuit installed.
• A built-in mute circuit installed. (This circuit can mute the outputs of the drivers
except for those for loading motors.)
• The power supplies for PreVcc, the actuator part, the loading part, and PowVcc
of the feed motor part/spindle motor part are provided independently to achieve
an efficient drive.
{ ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
Parameter
Symbol
Power Supply
PreVcc ,
Voltage
PowVcc
Power Dissipation
Pd
Maximum Output
Iomax
Current
Operating
Topr
Temperature Range
Storage Temperature
Tstg
Range
Limits
Unit
18
V
2.2
1
*1
*2
W
A
-35 to 85
°C
-55 to 150
°C
*1 When mounted on the glass/epoxy board with the size: 70 mm×70 mm, the thickness: 1.6 mm, and
the rate of copper foil occupancy area: 3% or less.
Over Ta=25°C, derating at the rate of 17.6mW/°C.
*2 The power dissipation should be specified within the ASO range.
{ RECOMMENDED OPERATING CONDITIONS
(To determine a power supply voltage, the power dissipation must be taken into consideration.)
PreVcc
PowVcc
4.5 to 14 (V)
4.5 to PreVcc (V)
This product has not been checked for the strategic materials (or service) defined in the Foreign
Exchange and Foreign Trade Control Low of Japan so that a verification work is required before
exporting it.
Not designed for radiation resistance.
REV. A
2/5
{
ELECTRIC CHARACTERISTICS (Ta=25°C, PreVcc=PowVcc3=12V, PowVcc1=PowVcc2=5V,
BIAS=1.65V, RL=8Ω, Rd=0.5Ω,C=100pF, unless otherwise noted.)
Parameter
Consumption Current (at no
signal)
Mute ON Voltage
Mute OFF Voltage
<Actuator Driver>
Output Offset Current
Maximum Output Amplitude
Transfer Gain
<Feed Motor Driver>
Input Op-amp Common
Mode Input Range
Input Bias Current
Low-level Output Voltage
Maximum Output Source
Current
Maximum Output Sink
Current
Output Offset Voltage
Maximum Output Amplitude
Closed Circuit Voltage Gain
<Loading Driver>
Offset Voltage
Maximum Output Amplitude
Voltage Gain
<Spindle Driver>
Offset Voltage
Maximum Output Amplitude
Voltage Gain
Symbol
MIN
TYP
MAX
Unit
IQ
-
34
44
mA
VMON
VMOFF
0
2.0
-
0.5
-
V
V
IOOF
VOM
Gvc
-6
3.6
1.5
0
4.0
1.8
6
2.1
mA
V
A/V
VICM
0.5
-
10.5
V
IBOP
VOLOP
-
0.2
300
0.5
nA
V
ISO
0.5
-
-
mA
ISI
0.5
-
-
mA
-50
0
50
mV
8.0
17.6
9.5
19.6
21.6
V
dB
-50
0
50
mV
3.5
15.7
4.0
17.7
19.7
V
dB
-50
0
50
mV
8.0
15.7
9.5
17.7
19.7
V
dB
VOOFS
L
VOMSL
GVSL
VOOFL
D
VOMLD
GVLD
VOOFS
P
VOMS
GVSP
Condition
No load applied
VIN=±1.65V
VIN=BIAS±0.2V
VIN=±1.65V
VIN=±0.2V
VIN=±1.65V
VIN=BIAS±0.2V
VIN=±1.65V
VIN=BIAS±0.2V
{ OUTLINE DIMENSIONS, SYMBOLS
(MAX 18.75 include BURR)
Product
number
(UNIT: mm)
REV. A
3/5
{ APPLICATION CIRCUIT DIAGRAM
Resistance unit: [Ω]
{ PIN NUMBERS, PIN NAMES
No
1
2
3
4
Pin Name
LDBIAS
BIAS
FCIN
CFCerr1
No
19
20
21
22
Pin Name
VOLD(-)
VOLD(+)
VOSL(-)
VOSL(+)
Description
Loading driver output (-)
Loading driver output (+)
Sled driver output (-)
Sled driver output (+)
23
VOSP(-)
Spindle driver output (-)
24
25
26
VOSP(+)
PGND2
PVcc2
Spindle driver output (+)
Power GND2
Power Vcc2
27
PVcc3
PreGND
PVcc1
VNFFC
PGND1
Description
Loading unit bias input
Bias input
Focus driver input
Capacitor connection terminal 1 for error amp
filter
Capacitor connection terminal 2 for error amp
filter
Mute terminal
Tracking driver input
Capacitor connection terminal 1 for error amp
filter
Capacitor connection terminal 2 for error amp
filter
Pre GND
Power Vcc1
Focus driver feedback terminal
Power GND1
5
CFCerr2
6
7
8
MUTE
TKIN
CTKerr1
9
CTKerr2
10
11
12
13
28
29
30
31
PreVcc
SPIN
OPOUTSL
OPINSL(-)
14
VNFTK
Tracking driver feedback terminal
32
OPINSL(+)
15
16
17
18
VOTK(-)
VOTK (+)
VOFC(-)
VOFC (+)
Tracking driver output (-)
Tracking driver output (+)
Focus driver output (-)
Focus driver output (+)
33
34
35
36
LDIN
OPOUT
OPIN(-)
OPIN(+)
Notes:
Power Vcc3
Pre Vcc
Spindle driver input
Sled pre-stage amp output terminal
Sled pre-stage amp inverted input
terminal
Sled pre-stage amp non-inverted input
terminal
Loading driver input
OP-amp output terminal
OP-amp inverted input terminal
OP-amp non-inverted input terminal
The polarity signs shown in the output terminal names indicate the polarities when corresponding
input pins are set to (+).
REV. A
4/5
{ CAUTIONS ON USE
(1) Setting the voltage on the Mute terminal to open or 0.5V or less will activate a mute function for the
CH1, 2, 4, and 5.
Under conditions of normal use, the Mute terminal should be pulled-up to 2.0V or above.
(2) When the power supply voltage drops to 3.5V (Typ.) or less, the mute function will be activated and,
when recovering to 3.7V (Typ.) or above, the circuit will startup again.
(3) On the Bias terminal (pin 1, 2), the applied voltage of 1.0V (Typ.) or less will activate a mute function.
Under conditions of normal use, it should be set to 1.2V or above.
(4) Connecting a capacitive load to the OP-AMP output results in a phase margin reduction of the amp and
may cause an oscillation or a peak. When connecting a capacitive load, a resistance must be
inserted in series between the output and the capacitive load. And after careful consideration of the
frequency characteristics, the device should be used within the range where no problem is found in
actual use.
(5) The radiating fin must be connected to the external GND.
(6) Short-circuit between output pin -VCC (supply fault), output pin-GND (ground fault), or output terminals
(load short) must be avoided. Placing ICs in wrong orientations may damage the ICs or produce
smoke.
(7) Basically, applying a voltage below the IC sub-potential to any terminals must be avoided.
Due to a counter electromotive force of the load, if the output on each driver has dropped to the IC
sub-potential (GND) or less, an operation margin must be considered and examined.
(8) About absolute maximum ratings
Exceeding the absolute maximum ratings, such as the applied voltage or the operating temperature
range, may cause permanent device damage. As these cases cannot be limited to the broken short
mode or the open mode, if a special mode where the absolute maximum ratings may be exceeded is
assumed, it is recommended to take mechanical safety measures such as attaching fuses.
(9) About power supply lines
As a measure against the back current regenerated by a counter electromotive force of the motor, a
capacitor to be used as a regenerated-current path can be installed between the power supply and
GND and its capacitance value should be determined after careful check that any problems, for
example, a leak capacitance of the electrolytic capacitor at low temperature, are not found in various
characteristics.
(10) About GND potential
The electric potential of the GND terminal must be kept lowest in the circuitry at any operation states.
(11) About thermal design
With consideration of the power dissipation (Pd) under conditions of actual use, a thermal design
provided with an enough margin should be done.
(12) About operations in a strong electric field
When used in a strong electric field, note that a malfunction may occur.
(13) ASO
When using this IC, the output Tr must be set not to exceed the values specified in the absolute
maximum ratings and ASO.
(14) Thermal shutdown circuit
This IC incorporates a thermal shutdown circuit (TSD circuit). When the chip temperature reaches the
value shown below, the coil output to the motor will be set to open.
The thermal shutdown circuit is designed only to shut off the IC from a thermal runaway and not
intended to protect or guarantee the entire IC functions.
Therefore, users cannot assume that the TSD circuit once activated can be used continuously in the
subsequent operations.
TSD ON Temperature
[°C] (typ.)
175
Hysteresis Temperature
[°C] (typ.)
25
(15) About earth wiring patterns
When a small signal GND and a large current GND are provided, it is recommended that the large
current GND pattern and the small signal GND pattern should be separated and grounded at a single
point of the reference point of the set in order to prevent the voltage of the small signal GND from being
affected by a voltage change caused by the resistance of the pattern wiring and the large current.
Make sure that the GND wiring patterns of the external components will not change, too.
REV. A
5/5
+
(16) This IC is a monolithic IC which has a P isolations and P substrate to isolate elements each other.
This P layer and an N layer in each element form a PN junction to construct various parasitic elements.
Due to the IC structure, the parasitic elements are inevitably created by the potential relationship.
Activation of the parasitic elements can cause interference between circuits and may result in a
malfunction or, consequently, a fatal damage. Therefore, make sure that the IC must not be used
under conditions that may activate the parasitic elements, for example, applying the lower voltage than
the ground level (GND, P substrate) to the input terminals.
In addition, do not apply the voltage to input terminals without applying the power supply voltage to the
IC. Also while applying the power supply voltage, the voltage of each input terminal must not be over
the power supply voltage, or within the guaranteed values in the electric characteristics.
<Supplemental Remarks>
Current feedback driver
The transfer gain (output current / input current) can be determined by the following equation:
gm =
1
(A/V)
Rd + RWIRE
Where RWIRE represents a gold wire resistance inside the package, measuring approximately 0.075Ω
(±0.05Ω) (Typ.)
REV. A
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level
of reliability and the malfunction of which would directly endanger human life (such as medical
instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers
and other safety devices), please be sure to consult with our sales representative in advance.
It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance
of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow
for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in
order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM
cannot be held responsible for any damages arising from the use of the products under conditions out of the
range of the specifications or due to non-compliance with the NOTES specified in this catalog.
Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact your nearest sales office.
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Appendix1-Rev2.0