Rohm BA5961FV Power driver for cd player Datasheet

BA5961FV
Optical disc ICs
Power driver for CD player
BA5961FV
BA5961FV is 1ch BTL driver IC for tilt coil driving used for DVD-ROM / DVD-RAM / CD-ROM / CD-RW.
2 general-purpose operational amplifiers are integrated into the small package, this IC has achieved a reduction of its size,
and external components.
This IC can be used not only for tilt coil, but also for wide variety of applications.
!Applications
DVD-ROM, DVD-RAM, CD-ROM, CD-RW
!Features
1) 1ch BTL driver.
2) SSOP-B20W power package enables the smallest configuration.
3) Separating VCC into Pre and Power can be make better power efficiency.
4) Built in level shift circuit.
5) Built in thermal-shut-down circuit.
6) Built in three operational amplifiers .(Two general purpose operational amplifiers and one pre operational amplifier.)
!Absolute maximum ratings (Ta=25°C)
Parameter
Symbol
Limits
Unit
Preblock power supply voltage
PreVCC
18
V
Powerblock power supply voltage
PowVCC
18
V
W
Pd
1.18∗
Operating temperature
Topr
−35~+85
°C
Storage temperature
Tstg
−55~+150
°C
Power dissipation
∗ PCB (70mm×70mm×1.6mm, glass epoxy) mounting.
Reduce power by 9.44mW for each degree above 25°C.
!Recommended operating conditions (Set the power supply voltage taking allowable dissipation into considering)
Parameter
Symbol
Min.
Typ.
Max.
Preblock power supply voltage
PreVCC
4.3
5
13.5
Powerblock power supply voltage
PowVCC
4.3
5
PreVCC
Unit
V
1/7
BA5961FV
Optical disc ICs
!Block diagram
20
19
18
17
16
15
14
13
12
11
+
−
+
−
+
−
+
−
IN
LEVEL SHIFT
+
−
STAND-BY
TSD
1
2
3
+
−
Pow
GND 1
+
−
Pre
GND
Pow
VCC
4
5
6
Pow
GND 2
Pre
VCC
8
9
7
10
TSD : Thermal shut down
!Pin descriptions
Pin No.
Pin name
Pre ground
11
OP3+
OP-AMP3 positive input
Power ground (For positive output)
12
OP3−
OP-AMP3 negative input
Driver positive output
13
OP3OUT
Driver positive output
14
OP2+
OP-AMP2 positive input
Powerblock power supply
15
OP2−
OP-AMP2 negative input
OUT−
Driver negative output
16
OP2OUT
7
OUT−
Driver negative output
17
OP1+
OP-AMP1 positive input
8
PowGND2
Power ground (For negative output)
18
OP1−
OP-AMP1 negative input
9
PreVCC
Pre block power supply
19
IN
10
STBY
Stand-by control input
20
BIAS
Pin No.
Pin name
1
PreGND
2
PowGND1
3
OUT+
4
OUT+
5
PowVCC
6
Functions
Functions
OP-AMP3 output
OP-AMP2 output
OP-AMP1 output and driver input
Bias input
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BA5961FV
Optical disc ICs
!Input output circuits
Driver output
OP-AMP input
Pre VCC
positive
output
3, 4pin
Pre VCC
1k
positive input
11, 14, 17pin
10k
Pow VCC
Pre VCC
1k
negative input
12, 15, 18pin
10k
negative
output
6, 7pin
10k
BIAS input
OP-AMP output
Pre VCC
Pre VCC
Pre VCC
24.3k
Pre VCC
13, 16pin
50k
20pin
100k
Pre-OP-AMP output and driver input
Stand-by control input
Pre VCC
Pre VCC
Pre VCC
19pin
Pre VCC
10pin
100k
24.3k
100k
3/7
BA5961FV
Optical disc ICs
!Electrical characteristics (unless otherwise noted, Ta=25°C, PreVCC=PowVCC=5V, VBIAS=1.65V, RL=8Ω)
Parameter
Conditions
Measuring
circuit
Fig.1
Symbol
Min.
Typ.
Max.
Unit
IQ
−
10.0
14.0
mA
Output offset voltage
VOOF
−60
−
60
mV
Maximum output voltage amplitude
VOM
3.0
3.6
−
V
Maximum output voltage amplitude (Separated voltage supply)
VOMS
3.5
4.2
−
V
PreVCC=12V, PowVCC=5V
Fig.1
Closed circuit gain
GVC
16.0
18.0
20.0
dB
VIN=1.35V, 1.95V
Fig.1
Srand-by ON voltage
VSTON
−
−
0.5
V
Fig.1
Srand-by OFF voltage
VSTOFF
2.0
−
−
V
Fig.1
Quiescent current without signal
<Driver block>
VIN=BIAS=1.65V
Fig.1
Fig.1
<Operational amplifier>
VOFOP
−6
0
6
mV
Fig.1
Input bias current
IBOP
−
30
300
nA
Fig.1
Common mode input range
VICM
0.1
−
3.8
V
High level output voltage
VOH
4.1
4.8
−
V
VIN=GND, Invert amp.
Fig.1
Low level output voltage
VOL
−
0.2
0.9
V
VIN=VCC, Invert amp.
Fig.1
Output drive current(Sink)
ISI
0.5
−
−
mA
Output drive current(Sorce)
ISO
0.5
−
−
mA
SROP
−
1
−
V / µs
Offset voltage
Slew rate
Fig.1
Fig.1
Fig.1
100kHz square wave, 2Vpk-pk
Fig.1
This product in not designed for protection against radioactive rays.
4/7
BA5961FV
Optical disc ICs
!Measuring circuit
OPIN−
OPIN+
OPOUT
OPIN−
OPIN+
OPOUT
OPIN−
OPIN+
20
OPOUT
VBIAS
19
18
17
16
15
14
13
12
11
BA5961FV
1
2
3
4
5
6
0.1µ
7
8
9
10
0.1µ
A
IQ
0.1µ
RL
VST
VCC=5V
8
V
OPOUT
OPIN−
OPIN+
VO
VIOF
OPB
3
V
1M
VBOP
V
NF
V
3
1M
1
2
OPIN
ISI
3
1
1
VOOP
2
1.65V
OPBIAS
2
10k
10k
OPRL
1
V
2
ISO
VIN
Fig.1
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BA5961FV
Optical disc ICs
1. Switch table
(1) Driver (VBIAS=OPBIAS=1.65V, OPIN→2, NF→2, OPRL→1)
Symbol
Switch
RL
Input
VST
VIN
Measuring point
IQ
OFF
−
2.0V
IQ
Voof
ON
1.65V
2.0V
VO
VOM
ON
∗1
2.0V
∗1 VIN=0V and 5V
VO
GVC
ON
±0.3V
2.0V
VIN=1.35V and 1.95V
VO
VSTON
ON
5V
0.5V
VO
VSTOFF
ON
5V
2.0V
VO
(2) OP-AMP (VST=2.0V, VBIAS=1.65V, RL→OFF)
Symbol
OPB
Input
Switch
NF OPRL OPIN VIN OPBIAS
Measuring point
VOFOP
1
1
1
1
−
1.65V
VIOF
IBOP
1
3
1
1
−
1.65V
VBOP / 1MΩ
VOHOP
1
2
1
2
0V
2.5V
VBIAS=2.5V
VOOP
VOLOP
1
2
1
2
5V
2.5V
VBIAS=2.5V
VOOP
ISI
1
1
3
1
−
1.65V
ISI=0.5mA
VIOF
ISO
1
1
2
1
−
1.65V
ISO=0.5mA
VIOF
SROP
2
1
1
1
−
±1V
100kHz square wave, 2Vp-p input
VOOP
!Application example
SERVO PRE AMP
10k
SIGNAL
BIAS
STAND-BY
10k
20
19
18
17
16
15
14
13
12
11
7
8
9
10
BA5961FV
1
2
3
4
5
6
0.1µ
0.1µ
VCC
M
LOAD
Fig.2
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BA5961FV
Optical disc ICs
!Operation notes
1. A thermal-shutdown circuit (over-temperature protection circuit) is built in to prevent the IC from thermal breakdown.
Use the IC under the thermal loss allowed to the package. In case the IC is left running over the allowable loss, the
junction temperature rises, and the thermal-shutdown circuit works at the junction temperature of 175°C (typ.)
(the outputs of the driver is turned off). When the junction temperature drops to 150°C (typ.), the IC start operating
again.
2. When stand-by control terminal (Pin 10) drops below 0.5V, stand-by mode is established. Make sure that under normal
operating conditions, this pin at 2.0V or above.
3. If PreVCC (Pin 9) drops below 3.4V (typ.), the driver is turned off. When the voltage exceeds 3.6V (typ.) the driver
returns to its previous state.
4. If the bias pin (Pin 20) drops below 0.7V, the output is muted. Make sure that under normal operating conditions, this
pin is at 1.0V or above.
5. The output is muted in the event of a thermal shut down, mute-on, or a bias and Pre-VCC voltage drop. Only the driver
is muted. When muted, the internal bias voltage of the output pin becomes roughly (Pow VCC-Vf) / 2).
6. Please connect a bypass capacitor (0.1µF) across the supply voltage lines close to the IC pins.
7. When a capacitance load is connected to the OP amplifier output, the amplifier phase margin decreases, which causes
the peak or oscillation. When connecting such load, insert a resistance in series between the output and the
capacitance load and take a full consideration for frequency characteristics to prevent problem during practical use.
8. Do not short-circuit between any output pin and supply pin (supply fault) or ground (ground fault), or between any
output pins (load short-circuit). When mounting the IC on the circuit board, be extremely cautions about the orientation
of the IC. If the orientation is mistaken, the IC may break down, and produce smoke in some cases.
!Electrical characteristics curve
POWER DISSIPATION : Pd (W)
1.5
On less than 3%
(percentage occupied by copper foil),
70mm×70mm, t=1.6mm
glass epoxy mounting.
1.0
0.5
0
0
25
50
75
100
125
150
175
AMBIENT TEMPERATURE : Ta (°C)
Fig.3 Power dissipation
!External dimensions (Units : mm)
6.5±0.2
11
1
10
1.7±0.2
0.11
0.3Min.
8.1±0.3
6.1±0.2
20
0.65
0.15±0.1
0.1
0.22±0.1
SSOP-B20W
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