BA5954FM - ROHM Co., Ltd. - Datasheet.Live

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Structure : Silicon Monolithic Integrated Circuit

Product Name : BLT Driver For DVD-ROM

Device Name : BA5954FM

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

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 an d 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.

The current feedback technique can reduce the current phase shift caused by the load

inductance.

A general op-amp connected to the input terminal helps compute additions of

differential inputs or signals.

A tri-state logic input is used to determine a forward or reverse operation.

It can be used as a linear BTL driver.

{ ABSOLUTE MAXIMUM RATINGS

Parameter Symbol Limits Unit

Power Supply

Voltage Vcc, PVcc1/2 13.5 V

Power Dissipation Pd 2.2*1 W

Operating

Temperature Range Topr -35 to 85 °C

Storage Temperature

Range Tstg -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.

{ RECOMMENDED OPERATING CONDITIONS

Parameter Symbol Limits Unit

Vcc 4.3 to 13.2 V

PVcc1 4.3 to Vcc V

Power supply

Voltage PVcc2 4.3 to Vcc 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.

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{ ELECTRIC CHARACTERISTICS (Ta=25°C, Vcc=12V , PVcc1=PVcc2=5V, BIAS=2.5V, RL=8Ω+, Rd=0.5Ω,

C=100pF, unless otherwise noted)

Parameter Symbol MIN. TYP. MAX. Unit Condition

Quiescent Consumption

Current Icc - 18 27 mA

Standby Circuit Current I

- - 0.5 mA

Standby ON Voltage V

STON

0 - 0.5 V

Standby OFF Voltage V

STOFF

2.0 - - V

Output Offset Current I

-6 - 6 mA

Maximum Output Amplitude V

3.6 4.0 - V

Transfer Gain g

1.3 1.5 1.7 A/V

=BIAS±0.2V

Input OP Amp Common

Mode Input Range V

ICM

-0.3 - 11.0 V

Input Bias Current

(Discharge Current) I

BOP

- 30 300 nA

L-level Output Voltage V

OLOP

- 0.1 0.3 V

Maximum Output Source

Current I

0.3 0.5 - V

Maximum Output Sink

Current I

1 - - mA

Output Offset Voltage V

OOFSL

-100 0 100 mV

Maximum Output Amplitude V

OMSL

7.5 9.0 - V

Closed Circuit Voltage Gain G

VSL

18.0 20.0 22.0 dB Vin=±0.2V

Offset Voltage V

OOFLD

-50 0 50 mV

Maximum Output Amplitude V

OMLD

3.6 4.0 - V

Voltage Gain G

VLD

13.5 15.5 17.5 dB

=BIAS±0.2V

F・R Gain Difference ∆G

VLD0

0 1 2 dB

=BIAS±0.2V

{ OUTLINE DIMENSIONS, SYMBOLS

(UNIT:mm)

Product Number

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{ APPLICATION CIRCUIT DIAGRAM

{ PIN NUMBERS, PIN NAMES

No. Pin Name Description No. Pin Name Description

1 VINFC Focus driver input 15 VOTK+ Tracking driver output (+)

2 CGCerr1

Capacitor connection terminal for

error amp filter 16 VOTK- Tracking driver output (-)

3 CFCerr2

Capacitor connection terminal for

error amp filter 17 VOLD+ Loading driver output (+)

4 VINSL+ Op amp input (+) for Sled driver 18 VOLD- Loading driver output (-)

5 VINSL- Op amp input (-) for Sled driver 19 PGND Power GND

6 VOSL Op amp output for Sled driver 20 VNFTK Tracking driver feedback terminal

7 VNFFC Focus driver feedback terminal 21 PVcc2 Actuator driver part power Vcc

8 Vcc Pre Vcc, Sled driver part power Vcc 22 PreGND Pre GND

9 PVcc1 Loading driver part power Vcc 23 VINLD Loading driver input

10 PGND Power GND 24 CTKerr2

Capacitor connection terminal for

error amp filter

11 VOSL- Sled driver part output (-) 25 CTKerr1 Capacitor connection terminal for

error amp filter

12 VOSL+ Sled driver part output (+) 26 VINTK Tracking driver input

13 VOFC- Focus driver part output (-) 27 BIAS Bias input

14 VOFC+ Focus driver part output (+) 28 STBY 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, PVcc1ｋ 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.

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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 an d 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.) Hysteresis Temperature

[°C] (typ.)

175 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.

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Current feedback driver

The transfer gain (output current / input current) can be determined by the following equation:

gm =

WIREd

(A/V)

Where RWIRE represents a gold wire resistance inside the package, measuring approximately 0.15Ω (±0.05Ω)

(Typ.)

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.

Appendix1-Rev2.0

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More detail product informations and catalogs are available, please contact your nearest sales office.

ROHM Customer Support System THE AMERICAS / EUPOPE / ASIA / JAPAN

www.rohm.com

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.

21, Saiin Mizosaki-cho, Ukyo-ku, Kyoto 615-8585, Japan TEL : +81-75-311-2121

FAX : +81-75-315-0172

Appendix