BA5955FPE2 - ROHM SEMICONDUCTOR - Datasheet.Directory

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Structure : Silicon Monolithic Integrated Circuit

Product Name : Power Driver for DVD-RAMs

Device Name : BA5955FP

Features : • 2-ch current feedback-type BTL driver

• Use of an HSOP25PIN power package allows downsizing of the set.

• A wide dynamic range

• A built-in thermal shutdown circuit installed.

• The pre stage (PRE part) and the output stage (POW part) are separated to

achieve an efficient drive.

• A built-in standby function installed.

{ ABSOLUTE MAXIMUM RATINGS (Ta=25°C)

Parameter Symbol Limits Unit

Power Supply Voltage Vcc 18 Ｖ

Power Dissipation Pd 1.45*1 W

Maximum Output

Current Iomax 1*2 A

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 11.6mW/°C.

*2 The power dissipation should be specified within the ASO range.

{ OPERATING CONDITIONS

Parameter Symbol Limits Unit

Pre-stage Power Supply

Voltage PreVcc PowVcc+3 to 14 V

Output-stage Power

Supply Voltage PowVcc 4.5 to 11 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, PreVcc=12V , PowVcc=5V, Vc=2V, RL=6Ω+150uH,

Rd=0.5Ω, unless otherwise noted.)

Parameter Symbol MIN. TYP. MAX. Unit Condition

Standby Consumption

Current IST - 0.1 1 mA At standby

Quiescent

Consumption Current IQpre - 21 32 mA

Output Offset Current Ioof -6 - 6 mA

Maximum Output

Amplitude 1 VOM1 3.6 3.9 - V

Maximum Output

Amplitude 2 VOM2 5.8 6.1 - V When POWVcc= 8V

Transfer Gain Gm 0.9 1 1.1 A/V VIN= ±0.2V

STBY ON Voltage VSON - - 0.5 V

STBY OFF Voltage VSOFF 2 - - V

Output Voltage (at no

signal) Vodet 1.9 2.0 2.1 V

Closed Circuit Voltage

Gain Gvdet 5.0 6.0 7.0 dB

Output Driving Current

Sink ISIdet 1.0 - - mA

Output Driving Current

Source ISOdet 1.0 - - mA

Slew Rate SRdet - 1 - V/µs100KHz square wave 2Vp-p

output

Voltage Gain

Bandwidth Product GBW - 10 - MHz

<Reset>

Output Voltage in

non-operation VRSTOFF 2.8 - - V 3.3V PULL UP with 10KΩ

attached

Output Voltage in

operation VRSTON - - 0.5 V

3.3V PULL UP with 10KΩ

attached

{ OUTLINE DIMENSIONS, SYMBOLS

(UNIT: mm)

Product Number

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25 24 23 22 21 20 19 18 17 16 15 14

PreVcc

PreVcc/Vc

DETECTER

PowVcc

11 2 3 4 5 6 7 8 9 11 12 1310

LEVEL

SHIFT

LEVEL

SHIFT

V/I

STBY

L:STBY

T.S.D.

PowVcc

RESETOUT

0.5Ω Focuscoil

μ-COM

A/D

FOCUS

0.5Ω Trackingcoil

STAND-BY

μ-COM

A/D

TRACKING

10K

12V

{ APPLICATION CIRCUIT DIAGRAM

T.S.D: (Thermal shutdown)

Resistance unit: [Ω]

{ PIN Description

No. Pin Name Description No. Pin Name Description

1 Vc Reference input for input signal 25 PreVcc Pre stage power supply terminal

2 IN1 CH1 input 24 IN2 CH2 input

3 FIL1

Error amp phase compensation

external terminal 1 23 FIL2

Error amp phase compensation

external terminal 2

4 EOUT1 CH1 error amp output 22 EOUT2 CH2 error amp output

5 DETOUT1 CH1 current detection amp output 21 DETOUT2 CH2 current detection amp output

6 DETIN1P

CH1 current detection amp

non-inverted input 20 DETIN2P

CH2 current detection amp

non-inverted input

7 GND Substrate GND

8 RESET Reset output 19 GND Substrate GND

9 STBY Standby input 18 PowVcc

Output stage power supply

terminal

10 DETIN1M

CH1 current detection amp inverted

input 17 DETIN2M

CH2 current detection amp

inverted input

11 OUT1M CH1 negative output 16 OUT2M CH2 negative output

12 OUT1P CH1 positive output 15 OUT2P CH2 positive output

13 OUT1P CH1 positive output 14 OUT2P CH2 positive output

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{ CAUTIONS ON USE

(1) The BA5955FP incorporates a TSD circuit (overheat protection circuit) and a reset circuit. When the

chip temperature has reached 175℃ (typ.), the output current will be muted while the reset output will

become ‘L’ and, when the chip temperature has dropped to 150℃ (typ.), the mute function will be reset

while the reset output will be ‘H.’ The reset output also becomes ‘L’ in the standby state.

(2) When the power supply voltage (PreVcc) has dropped to 3.8V (typ.) or less, the output current will be

muted while the reset output will become ‘L’ and, when PreVcc has recovered to 4.0V (typ.), the driver

part circuit will be initiated to set the reset output to ‘H.’

(3) When the reference input (Vc) voltage has dropped to 0.8V (typ.) or less, the output current will be

muted while the reset output will become ‘L.’

Under conditions of normal use, it should be 1.2V (typ.) or above.

(4) Thermal shutdown or a drop of reference voltage or power suppl y voltage will activate the mute

function, where only the driver part can be muted. While muting, the voltage at the output terminal will

equal to the internal reference voltage (approximately PowVcc/2).

(5) 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.

(6) A radiating fin must be connected to the external GND.

(7) Short-circuits between output pin-VCC, output pin-GND, or output terminals (load short) must be

avoided.

Mounting the ICs in improper directions may damage them or produce smoke.

(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 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.

(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.) Hysteresis Temperature

[°C] (typ.)

175 25

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(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.

(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.

Current feedback driver

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

gm =

R21

(A/V)

Rd = Resistance for current detection (Ω)

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