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. zApplications Changers for CD players and MD players. zFeatures 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. zAbsolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Logic input voltage Power dissipation BA6780 Symbol Limits VCC 18 V VFIN, VRIN 22 V Pd BA6780FP-Y Unit 1.31 ∗1 1.45 ∗2 W 1.4 ∗3 A Maximum current consumption Imax Operating temperature Topr −25∼+75 ˚C Storage temperature Tstg −55∼+150 ˚C ∗1 When a DIP18 package is used.Reduced by 10.48mW for each increase inTa of 1˚C over 25˚C. ∗2 When mounted on a PCB board (70mm×70mm, t=1.6mm glass epoxy board). Reduced by 11.6mW for each increase in Ta of 1˚C over 25˚C. ∗3 Should not exceed Pd or ASO values. zRecommended operating conditions (Ta = 25°C) Symbol Limits Unit Power supply voltage Parameter VCC 7∼16 V Input voltage for Vin VIN 0∼VCC / 2−1.0 V BA6780 / BA6780FP-Y Optical disc ICs zBlock diagram and pin descriptions BA6780 VIN2 FIN2 RIN2 Cτ2 VEE FBIN− FBIN+ OUT2+ OUT2− 18 17 16 15 14 13 12 11 10 VIN 10k DETECTOR VEE GOVERNOR DRIVER FWD/REV CONTROLLER 1/2 10k VEE VCC Vref 40k 10k 10k Vref Vref V/I 40k 20k VCC REVERSIBLE DRIVER FWD/REV CONTROLLER 10k Vref Vref THERMAL SHUT DOWN 10k 3.2k 10k VEE 10k 10k 10k VEE DRIVE BUFFER IOUT 17.1k VEE VCC VIN Vconst Vref 1 2 3 4 5 6 7 8 9 VIN1 FIN1 RIN1 Iout Vref Vreg VCC OUT1+ OUT1− Pin No. ∗ DRIVE BUFFER 10k Pin name I/O Function 1 VIN1 I 2 FIN1 I Input pin for setting high output voltage for the reversible driver Input pin for forward control signal for the reversible driver 3 RIN1 I Input pin for reverse control signal for the reversible driver 4 Iout O Governor load current detector output (open collector ∗1 ) 5 Vref O Internal reference voltage pin 6 Vreg O 4.6V constant voltage output Power supply (+) 7 VCC I 8 OUT1+ O Reversible driver output (+) 9 OUT1− O Reversible driver output (−) 10 OUT2− O Governor output (−) 11 OUT2+ O Governor output (+) 12 FBIN+ I Governor load current detector amplifier input (+) 13 FBIN− I Governor load current detector amplifier input (−) 14 VEE I Power supply (−) (connection within substrate) 15 Cτ 2 I For connection of capacitor for the governor PWM filter 16 RIN2 I Governor reverse control signal input 17 FIN2 I Governor forward control signal input 18 VIN2 I 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 23 FIN2 RIN2 Cτ2 VEE FBIN− FBIN+ OUT2+ 22 21 20 19 18 17 16 10k 10k OUT2− 15 14 VIN VEE GOVERNOR DRIVER FWD/REV CONTROLLER 1/2 VEE 10k 10k 10k VEE VCC DRIVE BUFFER 10k 10k 3.2k 10k 10k Vref Vref 10k 10k Vref Vref Vref THERMAL SHUT DOWN VCC VEE 40k VEE 40k 20k DRIVE BUFFER REVERSIBLE DRIVER FWD/REV CONTROLLER 1 2 VEE IOUT VIN 3 VIN1 17.1k 4 5 6 7 8 9 FIN1 RIN1 Iout Vref Vreg VCC Pin No. Pin name I/O 1 N.C. − VEE VCC Vconst Vref 10 Function Input pin for setting high output voltage for the reversible driver 2 VIN1 I 3 N.C − 4 FIN1 I Input pin for forward control signal for the reversible driver 5 RIN1 I Input pin for reverse control signal for the reversible driver 6 Iout O Governor load current detector output (open collector ∗1 ) 7 Vref O Internal reference voltage pin 8 Vreg O 4.6V constant voltage output 9 VCC I Power supply (+) 10 N.C. − 11 OUT1+ O 12 N.C. − 13 OUT1− O Reversible driver output (−) 14 OUT2− O Governor output (−) 15 N.C. − 16 OUT2+ O 17 FB IN + I Governor load current detector amplifier input (+) 18 FB IN − I Governor load current detector amplifier input (−) 19 VEE I Power supply (−) (connection within substrate) 20 Cτ 2 I For connection of capacitor for the governor PWM filter 21 R IN 2 I Governor reverse control signal input 22 F IN 2 I Governor forward control signal input 23 N.C. − 24 VIN2 I 25 N.C. − ∗1 Refer to operating notes. 11 OUT1+ Reversible driver output (+) Governor output (+) Input pin for setting high output voltage for the governor 12 13 OUT1− BA6780 / BA6780FP-Y Optical disc ICs zInput / 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 Load current detector 10k pin12 ( pin17 ) 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 zElectrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 10V) ( ∗1 BA6780FP-Y) Parameter Symbol Min. Typ. Max. Unit IQ − 8.0 16.0 mA Quiescent current Conditions Open mode with no load Mute on voltage VCC1 − − 3.5 V Mute on voltage when VCC falls Mute off voltage VCC2 5.5 − − V Mute off voltage when VCC rises VIN 0 − 4 V 1.0 µA − V With VCC as the reference potential With VCC as the reference potential Vref input voltage range − Vref pin current IIN − 0.02 PWM input high level voltage VIH 4.0 − PWM input low level voltage VIL − − 1.0 V PWM input high level current IIH − − 100 µA − PWM input low level current IIL −1.0 − 1.0 µA − VOF −100 0 100 mV RL (load)=9Ω, RO (current detector)=0.6Ω − <Electronic governor> Output offset voltage VOM 6.0 6.5 − V RL (load)=9Ω, RO (current detector)=0.6Ω Pin-to-pin output voltage 1-1 VOUT11 4.2 4.7 5.2 V Forward mode Pin-to-pin output voltage 1-2 VOUR12 −5.2 −4.7 −4.2 V Reverse mode Pin-to-pin output voltage 1-3 VOUT13 −100 0 100 mV Brake mode Pin-to-pin output voltage 1-4 VOUT14 −50 0 50 mV Stop mode GVNF 20.5 22.0 23.5 dB Vref=0V, VIN=−20dBV, f=1kHz Output saturation voltage VCESAT − 1.0 2.1 V IO=100mA, VIN2=5V, Total of upper side and lower side ineffective voltage of output Tr Pin-to-pin output voltage 2-1 VOUT21 4.5 5.0 5.5 V Forward mode Pin-to-pin output voltage 2-2 VOUT22 −5.5 −5.0 −4.5 V Reverse mode Pin-to-pin output voltage 2-3 VOUT23 −50 0 50 mV Brake mode Pin-to-pin output voltage 2-4 VOUT24 −50 0 50 mV Stop mode VOUT − 200 400 mV Difference in output voltage for IO=400mA and IO=100mA Output voltage Vreg 4.35 4.60 4.85 V Output load fluctuation (source) VOSO −20 −5 − mV 1mA source Output load fluctuation (sink) VOSI − 5 20 mV 1mA sink Max. pin-to-pin output voltage Voltage gain of positive feedback amplifier 12, 13 open 17, 18pin open ∗1 RL (load)=9Ω RO (current detector)=0.6Ω VIN2=2.5V <Reversible driver> Output load fluctuation IO=100mA VIN1=2.5V <4.6V constant-voltage output> Not designed for radiation resistance. − BA6780 / BA6780FP-Y Optical disc ICs zMeasurement circuit BA6780 VIN 10µF SW-3 2 R2 F2 II2 A 3 1 2 Vr2 1 2 SW-2 A IF2 A 3 IR2 9Ω 0.6Ω V 1 VO 2 2 SW-5 1 18 17 15 16 14 13 12 11 10 VIN 10k DETECTOR GOVERNOR DRIVER FWD/REV CONTROLLER 1/2 10k VEE VCC Vref 40k VEE DRIVE BUFFER 17.1k VEE VCC Vconst Vref 4 3 V/I 40k IOUT VIN 2 Vref Vref 20k VCC REVERSIBLE DRIVER FWD/REV CONTROLLER 10k 10k 10k Vref Vref VEE 10k 3.2k 10k THERMAL SHUT DOWN 10k 10k 10k 1 DRIVE BUFFER 10k 5 6 7 8 9 2 SW-1 1 IL1 A A IF1 A A IR1 IQ V V O1 Vr1 F1 R1 Vreg V 1 Ireg 2 VCC IL1 Fig.1 SW-4 BA6780 / BA6780FP-Y Optical disc ICs BA6780FP-Y VIN 10µF 2 R2 F2 A II2 3 1 2 1 SW-3 Vr2 SW-2 A IF2 A 2 3 IR2 9Ω 0.6Ω V 1 VO2 2 SW-5 1 25 24 23 22 21 20 19 18 17 10k 10k 16 15 14 VIN VEE VEE GOVERNOR DRIVER FWD/REV CONTROLLER 1/2 10k 10k 10k VEE VCC DRIVE BUFFER 10k 10k 10k 3.2k 10k Vref Vref 10k 10k Vref Vref Vref THERMAL SHUT DOWN VCC VEE 40k VEE 40k 20k DRIVE BUFFER REVERSIBLE DRIVER FWD/REV CONTROLLER 1 2 VEE IOUT VIN 3 4 5 17.1k VCC VEE Vconst Vref 6 7 2 SW-1 1 IL1 A A IF1 A 8 Ireg IR1 9 A 10 IQ 11 12 13 V V O1 Vr1 F1 Vreg R1 V 1 2 VCC IL1 Fig.2 SW-4 BA6780 / BA6780FP-Y Optical disc ICs zMeasurement circuit switch table BA6780 / BA6780FP-Y SW Parameter Input SW1 SW2 SW3 SW4 SW5 Vr1 Vr2 F1 R1 F2 R2 VIN IL1 Conditions Measure ment Quiescent current 1 1 3 1 1 0 0 0 0 0 0 − − − IQ Mute on voltage 1 1 3 1 1 2 0 0 5 0 0 − − VCC swept down from 10V VO1 Mute off voltage 1 1 3 1 1 2 0 0 5 0 0 − − VCC swept up from 0V V O1 Vref input voltage range 1 1 3 1 2 ∗1 ∗1 0 5 0 5 − − Vref pin current 2 2 3 1 1 0 0 0 0 0 0 − − PWM input high level voltage 1 1 3 1 2 2 2 ∗2 ∗2 ∗2 ∗2 − − PWM input low level voltage 1 1 3 1 2 2 2 ∗2 ∗2 ∗2 ∗2 − − PWM input high level current 1 1 3 1 1 0 0 5 − − PWM input low level current ∗1 Check for 5 5 5 abnormality in output in Vr1 and Vr2 input range − VO1 VO2 II1 II2 ∗2 Sweep the F/R input, V O1 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 5 5 5 5 IR1 − − − − − − VO2 − − − VO2 IR2 <Electronic governor> Output offset voltage 1 1 1 1 2 0 0 0 0 5 5 0 5 5 0 Max. pin-to-pin output voltage 1 Pin-to-pin output voltage 1-1 1 1 1 1 2 0 2.5 0 0 0 5 − − − VO2 Pin-to-pin output voltage 1-2 1 1 1 1 2 0 2.5 0 0 5 0 − − − VO2 Pin-to-pin output voltage 1-3 1 1 1 1 2 0 2.5 0 0 5 5 − − − VO2 Pin-to-pin output voltage 1-4 1 1 1 1 2 0 2.5 0 0 0 0 − − − VO2 Voltage gain of positive feedback amplifier 1 1 2 1 1 0 0 0 0 5 5 ∗3 − Output saturation voltage 1 1 1 2 1 5 0 0 5 0 0 5 0 − Pin-to-pin output voltage 2-1 1 1 3 2 1 2.5 0 0 5 0 0 − Pin-to-pin output voltage 2-2 1 1 3 2 1 2.5 0 5 0 0 0 − Pin-to-pin output voltage 2-3 1 1 3 1 1 2.5 0 5 5 0 0 − Pin-to-pin output voltage 2-4 1 1 3 1 1 2.5 0 0 0 0 0 − 0 5 5 0 1 3 1 2 0 4 0 0 ∗3 −20dBV, 1kHz V O2 <Reversible driver> Output load fluctuation 1 1 3 2 1 2.5 0 (take care ∗4 ∗4 100mA with polarity) ∗5 100mA ∗5 (take care with polarity) VCC −VO1 VO1 ∗6 Difference in 0 0 − ∗6 output voltage for I=400mA and I=100mA VO1 <4.6V constant-voltage output> Output voltage 1 1 3 1 1 0 0 0 0 0 0 − − − Vreg Output load fluctuation (source) 1 1 3 1 1 0 0 0 0 0 0 − − Source Ireg=1mA Vreg Output load fluctuation (sink) 1 1 3 1 1 0 0 0 0 0 0 − − Sink Ireg=1mA Vreg BA6780 / BA6780FP-Y Optical disc ICs zApplication example BA6780 RF-500TB M VEE VEE 18 17 15 16 Rdet=0.6Ω 14 13 12 11 10 VIN VEE GOVERNOR DRIVER FWD/REV CONTROLLER 1/2 10k DETECTOR 10k VEE VCC Vref 3.2k 10k 40k VEE 17.1k VEE VCC Vconst 4 5 6 7 8 RESET REV FWD VEE VDD VDD GND µ-COM Fig.3 9 M VEE FWD Vref DRIVE BUFFER Rreset REV Vref V/I VEE Vref 3 10k 10k 40k IOUT VIN 2 10k 20k VCC REVERSIBLE DRIVER FWD/REV CONTROLLER 10k Vref Vref THERMAL SHUT DOWN 10k 10k 10k 1 DRIVE BUFFER 10k BA6780 / BA6780FP-Y Optical disc ICs BA6780FP-Y RF-500TB M VEE VEE 25 24 22 23 21 VEE 20 Rdet=0.6Ω 19 18 17 10k 10k 16 15 14 VIN VEE GOVERNOR DRIVER FWD/REV CONTROLLER 1/2 VEE 10k 10k 10k VEE VCC DRIVE BUFFER 10k 10k 10k 3.2k 10k Vref Vref 10k 10k Vref Vref Vref THERMAL SHUT DOWN VCC VEE 40k VEE 40k 20k DRIVE BUFFER REVERSIBLE DRIVER FWD/REV CONTROLLER 1 2 VEE IOUT VIN 4 3 5 17.1k VEE VCC Vconst Vref 6 7 8 9 10 11 12 VEE M Rreset VEE RESET REV FWD FWD REV VEE VDD VDD GND µ-COM Fig.4 13 BA6780 / BA6780FP-Y Optical disc ICs zInput / output truth table <Reversible drive> FIN RIN OUT (+) OUT (−) Mode L H H L Forward mode H L L H Reverse mode H H L L Brake mode L L OPEN OPEN Open mode FIN RIN OUT (+) OUT (−) <Governor drive> Mode L H H L Forward mode H L L H Reverse mode H H VCC / 2 VCC / 2 Brake mode L L OPEN OPEN Open mode zUsing 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 × RDET 3.2kΩ VRESET=VDD−IDET × RRESET ∴ VRESET=VDD− IO × RDET × RRESET 3.2kΩ (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 zOperation notes (1) The BA6780 and BA6780FP-Y have built in shutdown circuit that mute the output current when the chip temperature reaches 175°C (Typ.). The hysteresis is set to 25°C (Typ.), so the mute will be released when the chip temperature falls to 150°C (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 Control signal input voltage range GND (VCC) Driver input voltage range Vref pin input voltage range VEE zElectrical characteristic curves 1.45 1.31 HSOP-25 When mounted on ROHM standard PCBS. 1 DIP18 Single unit OUTPUT VOLTAGE : VO (V) POWER DISSIPATION : Pd (W) RL= ∞ 20Ω 16Ω 12Ω 8Ω VCC=10V 8 (input form filter pin) 6 4 2 0 −2 −4 VCC+5V −6 −8 0 0 25 50 75 100 125 150 175 −10 −5 −4 −3 −2 −1 0 1 VIN Filter LOGIC Internal Vref 2 RL V VO 10 V 8 OUTPUT VOLTAGE : VO (V) 10 2 External Vref RL = ∞ 20Ω 16Ω 12Ω 8Ω VO RL 6 FWDmode 4 2 0 1.0 2.0 3.0 4.0 −4 REVmode −6 0.6Ω −8 3 4 AMBIENT TEMPERATURE : Ta (˚C) DIP18package INPUT VOLTAGE : VIN (V) Fig.5 Thermal dissipation curve Fig.6 I / O characteristics with governor connected 5 5.0 −2 VCC=10V −10 8Ω 12Ω 16Ω 20Ω ∞ Vref INPUT VOLTAGE : Vrefin (V) Fig.7 Reversible driver I / O characteristics BA6780 / BA6780FP-Y Optical disc ICs DETECTOR OUTPUT : VIO (V) 4 VIO V VCC VCC 4 3 5.2V / A −5.2V / A 2 1 −1000 −800 −600 −400 −200 0 200 400 600 800 1000 IL=0mA 14 VCC 12 V Vref VEE 10 8 6 4 2 0 0 LOAD CURRENT : IL (mA) 5 10 1516 SUPPLY VOLTAGE : VCC (V) Fig.8 Load current detector output characteristics 7 4.6V REGULATOR OUTPUT VOLTAGE : Vreg (V) VCC=−10V RO=0.6Ω Rdet=30kΩ Vref OUTPUT VOLTAGE : Vref (V) 5 VCC+5 30k Fig.9 Internal Vref output characteristics IL=0mA 6 5 4 3 2 1 0 0 5 Fig.10 4.6V constant-voltage source output voltage characteristics BA6780FP-Y 22.9 ± 0.3 10 13.6 ± 0.2 6.5 ± 0.3 7.8 ± 0.3 9 0.51Min. 2.54 0.5 ± 0.1 DIP18 1.95 ± 0.1 0.8 0.25 ± 0.1 1.9 ± 0.1 1 0.3 ± 0.1 3.29 ± 0.2 14 7.62 0.11 3.95 ± 0.3 1 2.75 ± 0.1 25 5.4 ± 0.2 18 13 0.36 ± 0.1 0.3Min. 0.15 0 ~ 15 HSOP25 15 16 SUPPLY VOLTAGE : VCC (V) zExternal dimensions (Units : mm) BA6780 10