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BA6780 / BA6780FP-Y
Optical disc ICs
2-channel driver for CD changers
BA6780 / BA6780FP-Y
The BA6780 and BA6780FP-Y are 2-channel driver IC for CD changers that inculdes a reversible, variable speed electronic governor and a reversible driver. On sets that have dual-rail power supplies, the BA6780 and BA6780FP-Y can be operated from just the negative supply to reduce influence on the positive power supply. The input uses PWM control, and it is possible to directly input from a microprocessor running off the positive power supply.
Applications Changers for CD players and MD players.
Features 1) Output voltage can be freely set using the output voltage setting pin. 2) Internal mute function if the power supply voltage drops. 3) Thermal shutdown function. (Contains hysteresis) 4) PWM input. 5) Settable reference voltage output pin. 6) Wide operating supply voltage.
Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage Logic input voltage Power dissipation BA6780 BA6780FP-Y Maximum current consumption Operating temperature Storage temperature Imax Topr Tstg Symbol VCC VFIN, VRIN Pd Limits 18 22 1.31 1 1.45 2 1.4 3 -25+75 -55+150 W A C C Unit V V
1 When a DIP18 package is used.Reduced by 10.48mW for each increase inTa of 1C over 25C. 2 When mounted on a PCB board (70mmx70mm, t=1.6mm glass epoxy board). Reduced by 11.6mW for each increase in Ta of 1C over 25C. 3 Should not exceed Pd or ASO values.
Recommended operating conditions (Ta = 25C)
Parameter Power supply voltage Input voltage for Vin Symbol VCC VIN Limits 716 0VCC / 2-1.0 Unit V V
BA6780 / BA6780FP-Y
Optical disc ICs
Block diagram and pin descriptions BA6780
VIN2 18 VIN
FIN2 17
RIN2 16
C2 15
VEE 14
FBIN- 13 10k DETECTOR 10k
FBIN+ 12
OUT2+ 11
OUT2- 10
1/2
VCC
GOVERNOR DRIVER FWD/REV CONTROLLER
VEE
VEE
10k 10k 10k Vref 10k Vref
DRIVE BUFFER 10k
10k
10k
10k Vref
10k
3.2k
Vref
THERMAL SHUT DOWN
Vref
V/I
VEE VCC REVERSIBLE DRIVER FWD/REV CONTROLLER VIN 1 VIN1 2 FIN1 3 RIN1 4 Iout IOUT
40k
40k 20k VEE 17.1k VEE VCC DRIVE BUFFER
Vref 5 Vref
Vconst 6 Vreg 7 VCC 8 OUT1+ 9 OUT1-
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Pin name VIN1 FIN1 RIN1 Iout Vref Vreg VCC OUT1+ OUT1- OUT2- OUT2+ FBIN+ FBIN- VEE C 2 RIN2 FIN2 VIN2
I/O I I I O O O I O O O O I I I I I I I
Function Input pin for setting high output voltage for the reversible driver Input pin for forward control signal for the reversible driver Input pin for reverse control signal for the reversible driver Governor load current detector output (open collector 1 ) Internal reference voltage pin 4.6V constant voltage output Power supply (+) Reversible driver output (+) Reversible driver output (-) Governor output (-) Governor output (+) Governor load current detector amplifier input (+) Governor load current detector amplifier input (-) Power supply (-) (connection within substrate) For connection of capacitor for the governor PWM filter Governor reverse control signal input Governor forward control signal input Input pin for setting high output voltage for the governor
1 Refer to operating notes.
BA6780 / BA6780FP-Y
Optical disc ICs
BA6780FP-Y
VIN2 25 24 VIN 23 FIN2 22 RIN2 21 C2 20 VEE 19 FBIN- 18 FBIN+ 17 OUT2+ 16 15 DRIVE BUFFER 10k 10k 10k 10k 10k 3.2k Vref Vref 10k 10k 10k Vref 10k OUT2- 14
1/2
VCC
GOVERNOR DRIVER FWD/REV CONTROLLER
VEE
VEE
10k
10k
VEE
Vref
THERMAL SHUT DOWN
Vref
VCC VEE 40k 40k
VEE 20k DRIVE BUFFER
REVERSIBLE DRIVER FWD/REV CONTROLLER VIN 1 2 VIN1 3 4 FIN1 5 RIN1 IOUT 6 Iout
VEE Vref 7 Vref
17.1k VCC Vconst 8 Vreg 9 VCC
VEE
10
11 OUT1+
12
13 OUT1-
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Pin name N.C. VIN1 N.C FIN1 RIN1 Iout Vref Vreg VCC N.C. OUT1+ N.C. OUT1- OUT2- N.C. OUT2+ FB IN + FB IN - VEE C 2 R IN 2 F IN 2 N.C. VIN2 N.C.
I/O - I - I I O O O I - O - O O - O I I I I I I - I - Governor output (+) Reversible driver output (-) Governor output (-) Reversible driver output (+)
Function
Input pin for setting high output voltage for the reversible driver
Input pin for forward control signal for the reversible driver Input pin for reverse control signal for the reversible driver Governor load current detector output (open collector 1 ) Internal reference voltage pin 4.6V constant voltage output Power supply (+)
Governor load current detector amplifier input (+) Governor load current detector amplifier input (-) Power supply (-) (connection within substrate) For connection of capacitor for the governor PWM filter Governor reverse control signal input Governor forward control signal input
Input pin for setting high output voltage for the governor
1 Refer to operating notes.
BA6780 / BA6780FP-Y
Optical disc ICs
Input / output circuits ( ( ) :pins for BA6780FP-Y )
Pin function Equivalent circuit
VCC 85k pin 2, 3, 16, 17 ( pin4, 5, 21, 22 )
24k
Logic input
VEE 24k
VEE
VEE
pin1, 18 ( pin2, 24 )
Voltage setting input
VEE
10k
For connection of capacitor for PWM filter
pin15 ( pin20 )
VEE
10k
10k pin12 ( pin17 )
Load current detector
pin13 ( pin18 )
10k VEE
10k VEE
BA6780 / BA6780FP-Y
Optical disc ICs
Pin function Equivalent circuit
VCC
Output (reversible driver)
10k pin8, 9 ( pin11, 13 )
VEE
VCC
Output (governor)
10k pin10, 11 ( pin14, 16 )
VEE
VCC
1k
Load current detector signal output (governor)
pin4 ( pin6 )
VEE VEE
BA6780 / BA6780FP-Y
Optical disc ICs
Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 10V) ( 1 BA6780FP-Y)
Parameter Quiescent current Mute on voltage Mute off voltage Vref input voltage range Vref pin current PWM input high level voltage PWM input low level voltage PWM input high level current PWM input low level current Output offset voltage Max. pin-to-pin output voltage Pin-to-pin output voltage 1-1 Pin-to-pin output voltage 1-2 Pin-to-pin output voltage 1-3 Pin-to-pin output voltage 1-4 Voltage gain of positive feedback amplifier Output saturation voltage Pin-to-pin output voltage 2-1 Pin-to-pin output voltage 2-2 Pin-to-pin output voltage 2-3 Pin-to-pin output voltage 2-4 Output load fluctuation <4.6V constant-voltage output> Output voltage Output load fluctuation (source) Output load fluctuation (sink)
Not designed for radiation resistance.
Symbol IQ VCC1 VCC2 VIN IIN VIH VIL IIH IIL
Min. - - 5.5 0 - 4.0 - - -1.0 -100 6.0 4.2 -5.2 -100 -50 20.5
Typ. 8.0 - - - 0.02 - - - -
Max. 16.0 3.5 - 4 1.0 - 1.0 100 1.0
Unit mA V V V A V V A A
Conditions Open mode with no load Mute on voltage when VCC falls Mute off voltage when VCC rises - - With VCC as the reference potential With VCC as the reference potential - -
VOF VOM VOUT11 VOUR12 VOUT13 VOUT14 GVNF
0 6.5 4.7 -4.7 0 0 22.0
100 - 5.2 -4.2 100 50 23.5
mV V V V mV mV dB
RL (load)=9, RO (current detector)=0.6 RL (load)=9, RO (current detector)=0.6 Forward mode Reverse mode Brake mode Stop mode 12, 13 open 17, 18pin open 1 RL (load)=9 RO (current detector)=0.6 VIN2=2.5V
Vref=0V, VIN=-20dBV, f=1kHz
VCESAT VOUT21 VOUT22 VOUT23 VOUT24 VOUT
- 4.5 -5.5 -50 -50 -
1.0 5.0 -5.0 0 0 200
2.1 5.5 -4.5 50 50 400
V V V mV mV mV
IO=100mA, VIN2=5V, Total of upper side and lower side ineffective voltage of output Tr Forward mode Reverse mode Brake mode Stop mode Difference in output voltage for IO=400mA and IO=100mA VIN1=2.5V IO=100mA
Vreg VOSO VOSI
4.35 -20 -
4.60 -5 5
4.85 - 20
V mV mV 1mA source 1mA sink
-
BA6780 / BA6780FP-Y
Optical disc ICs
Measurement circuit BA6780
VIN 10F 2 F2 II2 R2 3 SW-3 1 3 2 1 0.6 9
A
1 2
Vr2 SW-2
A
IF2
A
IR2
V
VO2 2 1 SW-5
18 VIN
17
16
15
14
13 10k DETECTOR 10k
12
11 DRIVE BUFFER 10k
10
10k 10k Vref 10k Vref
1/2
VCC
GOVERNOR DRIVER FWD/REV CONTROLLER
10k
VEE
10k
10k
10k Vref
10k
3.2k
Vref
THERMAL SHUT DOWN
Vref
V/I
VEE VCC REVERSIBLE DRIVER FWD/REV CONTROLLER VIN 1 2 3 4 IOUT
40k
40k 20k VEE 17.1k VEE VCC DRIVE BUFFER
Vref 5
Vconst 6 7 8 9
2 SW-1 1 IL1
A
IF1
A
IR1 Vreg
A V
Ireg
IQ
V
VO1 1 2 IL1 SW-4
A
Vr1 F1
R1
VCC
Fig.1
BA6780 / BA6780FP-Y
Optical disc ICs
BA6780FP-Y
VIN 10F 2 F2 II2 R2 3 SW-3
A
1 2
1 3
Vr2 SW-2
2 1
0.6
9
A
IF2
A
IR2
V
VO2 2 1 SW-5
25
24 VIN
23
22
21
20
19
18 10k
17
16
15 DRIVE BUFFER
14
1/2
VCC
GOVERNOR DRIVER FWD/REV CONTROLLER
VEE
VEE 10k
10k 10k 10k 10k
10k
VEE
10k
3.2k
Vref Vref
10k
10k
10k Vref
Vref
THERMAL SHUT DOWN
Vref
VCC VEE 40k 40k
VEE 20k DRIVE BUFFER
REVERSIBLE DRIVER FWD/REV CONTROLLER VIN 1 2 3 4 5 IOUT 6
VEE Vref 7
17.1k VCC VEE Vconst 8 9 10 11 12 13
2 SW-1 1 IL1
A
IF1
A
IR1 Vreg
Ireg
A
IQ
V
VO1 1 2 IL1 SW-4
A
Vr1 F1 R1
V
VCC
Fig.2
BA6780 / BA6780FP-Y
Optical disc ICs
Measurement circuit switch table BA6780 / BA6780FP-Y
Parameter Quiescent current Mute on voltage 1 1 1 1 SW SW1 SW2 SW3 SW4 SW5 Vr1 3 3 1 1 1 1 0 2 Vr2 0 0 F1 0 0 Input R1 0 5 F2 0 0 R2 0 0 VIN - - - IL1 - - - - VCC swept down from 10V VCC swept up from 0V Conditions Measure ment IQ VO1
Mute off voltage
1
1
3
1
1
2
0
0
5
0
0
VO1
Vref input voltage range
1
1
3
1
2
1
0 2
1
0 2
1 Check for
0 5 0 5 - - abnormality in output in Vr1 and Vr2 input range - VO1 VO2 II1 II2
Vref pin current PWM input high level voltage PWM input low level voltage PWM input high level current PWM input low level current Output offset voltage Max. pin-to-pin output voltage Pin-to-pin output voltage 1-1 Pin-to-pin output voltage 1-2 Pin-to-pin output voltage 1-3 Pin-to-pin output voltage 1-4 Voltage gain of positive feedback amplifier Output saturation voltage Pin-to-pin output voltage 2-1 Pin-to-pin output voltage 2-2 Pin-to-pin output voltage 2-3 Pin-to-pin output voltage 2-4 Output load fluctuation
2 1
2 1
3 3
1 1
1 2
0
0
0
0
- - - - -
- - - - -
2 2 2 2
5 5
2 2 2 2
5 5
2 Sweep the F/R input,
1
1
3
1
2
2
2
VO1 and check that the mode switching is occurring in a range that satisfies VO2 the rated values - - IF1 IF2
1
1
3
1
1
0
0
1
1
3
1
1
0
0
5
5
5
5
IR1 IR2
1 1 1 1 1 1 1
1 1 1 1 1 1 1
1 3 1 1 1 1 2
1 1 1 1 1 1 1
2 2 2 2 2 2 1
0 0 0 0 0 0 0
0 4 2.5 2.5 2.5 2.5 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
5 0 5 0 5 5 0 5
5 5 0 5 0 5 0 5
- - - - - -
- - - - - - -
- - - - - -
VO2 VO2 VO2 VO2 VO2 VO2 VO2
3
3 -20dBV,
1kHz
1 1 1 1 1
1 1 1 1 1
1 3 3 3 3
2 2 2 1 1
1 1 1 1 1
5 2.5 2.5 2.5 2.5
0 0 0 0 0
0 5 0 5 5 0 0
5 0 5 0 5 0 5
0 0 0 0 0
0 0 0 0 0
- - - - -
4 4 100mA (take care with polarity) 5 100mA 5
(take care with polarity)
VCC -VO1
VO1
6 Difference in
0 0 -
1
1
3
2
1
2.5
0 5 0
6
output voltage for I=400mA and I=100mA
VO1
<4.6V constant-voltage output> Output voltage Output load fluctuation (source) Output load fluctuation (sink) 1 1 1 1 1 1 3 3 3 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 - - - - - - - Source Ireg=1mA Sink Ireg=1mA Vreg Vreg Vreg
BA6780 / BA6780FP-Y
Optical disc ICs
Application example BA6780
RF-500TB VEE
M
VEE Rdet=0.6
18 VIN
17
16
15
14
13 10k DETECTOR 10k
12
11 DRIVE BUFFER 10k
10
1/2
VCC
GOVERNOR DRIVER FWD/REV CONTROLLER
VEE
10k 10k Vref 10k Vref
10k
VEE
10k
10k
10k Vref
10k
3.2k
Vref
THERMAL SHUT DOWN
Vref
V/I
VEE VCC REVERSIBLE DRIVER FWD/REV CONTROLLER VIN 1 2 3 4 IOUT
40k
40k 20k VEE 17.1k VEE VCC DRIVE BUFFER
Vref 5
Vconst 6 7 8 9
Rreset VEE
M
VEE
REV
FWD
FWD
REV
RESET
VDD VDD
GND -COM
Fig.3
BA6780 / BA6780FP-Y
Optical disc ICs
BA6780FP-Y
RF-500TB VEE
M
VEE VEE Rdet=0.6
25
24 VIN
23
22
21
20
19
18 10k
17
16
15 DRIVE BUFFER
14
1/2
VCC
GOVERNOR DRIVER FWD/REV CONTROLLER
VEE
VEE
VEE 10k
10k 10k 10k 10k
10k
10k
3.2k
Vref Vref
10k
10k
10k Vref
Vref
THERMAL SHUT DOWN
Vref
VCC VEE 40k 40k
VEE 20k DRIVE BUFFER
REVERSIBLE DRIVER FWD/REV CONTROLLER VIN 1 2 3 4 5 IOUT 6
VEE Vref 7
17.1k VEE VCC Vconst 8 9 10 11 12 13
VEE
Rreset VEE
M
VEE
REV
FWD
FWD
REV
RESET
VDD VDD
GND -COM
Fig.4
BA6780 / BA6780FP-Y
Optical disc ICs
Input / output truth table
FIN L H H L RIN H L H L OUT (+) H L L OPEN OUT (-) L H L OPEN Mode Forward mode Reverse mode Brake mode Open mode

FIN L H H L RIN H L H L OUT (+) H L VCC / 2 OPEN OUT (-) L H VCC / 2 OPEN Mode Forward mode Reverse mode Brake mode Open mode
Using the load current detector output pin (pin 4) Refer to the example circuit on the right for the connection method. The VRESET value is determined as follows :
IDET= IO x RDET 3.2k VRESET=VDD-IDET x RRESET
VRESET=VDD- IO x RDET x RRESET 3.2k
(RDET is the load current detector resistance, refer to the application circuit)
VDD
RRESET VRESET
IDET 4 pin6 (BA6780FP-Y).
BA6780 / BA6780FP-Y
Optical disc ICs
Operation notes (1) The BA6780 and BA6780FP-Y have built in shutdown circuit that mute the output current when the chip temperature reaches 175C (Typ.). The hysteresis is set to 25C (Typ.), so the mute will be released when the chip temperature falls to 150C (Typ.). (2) The output current is muted when the supply (VCC) falls to 3V or less. When the mute is applied, the reverse driver is set to to the VEE level, and governor driver is set to the VEE / 2 level. (3) The VCC voltage level is the reference for the logic input pin input voltage, so when it is converted from the VEE potential, the high level becomes (VCC+5) V, and the low level becomes (VCC) V. The voltage potential levels for the pins are shown in the diagram below. (4) Connect a bypass capacitor at the base of this IC for the power supply.
VDD GND (VCC) Control signal input voltage range
Driver input voltage range Vref pin input voltage range VEE
Electrical characteristic curves
2
POWER DISSIPATION : Pd (W)
10
VCC=10V 8 (input form filter pin) 6
OUTPUT VOLTAGE : VO (V)
OUTPUT VOLTAGE : VO (V)
1.45 1.31 1 DIP18 Single unit HSOP-25 When mounted on ROHM standard PCBS.
RL= 20 16 12 8
10
V
VO
8 6 4 2 0 -2 -4 -6 -8
External Vref
RL
RL= 20 16 12 8 FWDmode
4 2 0 -2 -4 -6 -8
VCC+5V VIN Filter LOGIC Internal Vref RL
1.0
2.0
3.0
4.0 REVmode
5.0
V VO
0.6
VCC=10V
0 0
25
50
75
100
125
150
175
-10 -5 -4 -3 -2 -1
0
1
2
3
4
5
-10 Vref INPUT VOLTAGE : Vrefin (V)
8 12 16 20
AMBIENT TEMPERATURE : Ta (C) DIP18package
INPUT VOLTAGE : VIN (V)
Fig.5 Thermal dissipation curve
Fig.6 I / O characteristics with governor connected
Fig.7 Reversible driver I / O characteristics
BA6780 / BA6780FP-Y
Optical disc ICs
VCC+5 30k
IL=0mA
4.6V REGULATOR OUTPUT VOLTAGE : Vreg (V)
5
DETECTOR OUTPUT : VIO (V)
Vref OUTPUT VOLTAGE : Vref (V)
VIO V VCC VCC 4
4 3
VCC=-10V RO=0.6 Rdet=30k
7 IL=0mA 6 5 4 3 2 1 0 0
14 12
VCC
VEE
V Vref
10 8 6 4 2 0 0 5 10 1516
5.2V / A
2 1
-5.2V / A
-1000 -800 -600 -400 -200
0
200 400 600
800 1000
5
10
15 16
LOAD CURRENT : IL (mA)
SUPPLY VOLTAGE : VCC (V)
SUPPLY VOLTAGE : VCC (V)
Fig.8 Load current detector output characteristics
Fig.9 Internal Vref output characteristics
Fig.10 4.6V constant-voltage source output voltage characteristics
External dimensions (Units : mm)
BA6780 BA6780FP-Y
22.9 0.3 18 10
6.5 0.3
25
7.8 0.3 5.4 0.2
13.6 0.2 2.75 0.1 14
1
0.51Min.
9 7.62
3.95 0.3
1
1.9 0.1
1.95 0.1
13
0.11
0.3 0.1
3.29 0.2
0.8
0.36 0.1
0.3Min. 0.15
2.54
0.5 0.1
0 ~ 15
DIP18
HSOP25
0.25 0.1

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