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Structure
Product Name
Device Name
:
:
:
Silicon Monolithic Integrated Circuit
BLT Driver For DVD-ROM
BA5954FM
•
2CHs for current driving-type BTL drivers to drive two-axis actuators
•
1CH for a voltage driving-type BTL driver for a feed motor
4-ch driver comprising of 1CH for a voltage driving-type BTL driver for a loading
motor
•
A wide dynamic range (PreVcc=12V, PVcc=5V, 4.0V(Typ.) when RL=8Ω)
•
The pre-part + feed motor part, the loading motor part, and the actuator part are
provided with power supplies independently and its low voltage operation achieves
an efficient drive.
•
A built-in level shift circuit
•
A built-in thermal shutdown circuit is installed
•
A built-in standby function installed.
<Two-axis Actuator Driver>
The current feedback technique can reduce the current phase shift caused by the load
inductance.
<Feed Motor Driver>
A general op-amp connected to the input terminal helps compute additions of
differential inputs or signals.
<Loading Driver>
A tri-state logic input is used to determine a forward or reverse operation.
It can be used as a linear BTL driver.
Features
:
ABSOLUTE MAXIMUM RATINGS
Parameter
Power Supply
Voltage
Power Dissipation
Operating
Temperature Range
Storage Temperature
Range
Symbol
Vcc, PVcc1/2
Pd
Topr
Tstg
Limits
13.5
2.2
*1
-35 to 85
-55 to 150
Unit
V
W
°C
°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.
RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
Vcc
Power supply
PVcc1
Voltage
PVcc2
Limits
4.3 to 13.2
4.3 to Vcc
4.3 to Vcc
Unit
V
V
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
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APPLICATION CIRCUIT DIAGRAM
PIN NUMBERS, PIN NAMES
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Name
VINFC
CGCerr1
CFCerr2
VINSL+
VINSL-
VOSL
VNFFC
Vcc
PVcc1
PGND
VOSL-
VOSL+
VOFC-
VOFC+
Description
Focus driver input
Capacitor connection terminal for
error amp filter
Capacitor connection terminal for
error amp filter
Op amp input (+) for Sled driver
Op amp input (-) for Sled driver
Op amp output for Sled driver
Focus driver feedback terminal
Pre Vcc, Sled driver part power Vcc
Loading driver part power Vcc
Power GND
Sled driver part output (-)
Sled driver part output (+)
Focus driver part output (-)
Focus driver part output (+)
No.
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Pin Name
VOTK+
VOTK-
VOLD+
VOLD-
PGND
VNFTK
PVcc2
PreGND
VINLD
CTKerr2
CTKerr1
VINTK
BIAS
STBY
Description
Tracking driver output (+)
Tracking driver output (-)
Loading driver output (+)
Loading driver output (-)
Power GND
Tracking driver feedback terminal
Actuator driver part power Vcc
Pre GND
Loading driver input
Capacitor connection terminal for
error amp filter
Capacitor connection terminal for
error amp filter
Tracking driver input
Bias input
Standby terminal
Notes The polarity signs shown in the output terminal names indicate the polarities when corresponding
input pins are set to (+).
On the power supply terminals of the output H bridge, PVcc2 is set for the focus and tracking
drivers, PVcc1½ for loading, and Vcc for feed motor.
The power supply systems of the pre part are all set to Vcc.
Make sure that this device must be used under the following condition: VCC
≥
PVcc.
REV. A
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CAUTIONS ON USE
(1) Setting the Standby terminal to open or 0.5V or less allows the circuit current to be set in the standby mode.
Under conditions of normal use, the Standby terminal should be pulled-up to 2.0V or above.
(2) When the power supply voltage (Vcc) 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, the applied voltage of 0.9V (Typ.) or less will activate a mute function. Under
conditions of normal use, It should be set to 12V or above.
(4) 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.
(5) 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.
(6) About GND potential
The electric potential of the GND terminal must be kept lowest in the circuitry at any operation states.
(7) 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.
(8) About operations in a strong electric field
When used in a strong electric field, note that a malfunction may occur.
(9) ASO
When using this IC, the output Tr. must be set not to exceed the values specified in the absolute maximum
ratings and ASO.
(10) Thermal shutdown circuit (Thermal shutdown: TSD)
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
(11) 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.
(12) 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.
REV. A
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