BA6780

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 = 25°C) 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 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. Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Input voltage for Vin Symbol VCC VIN Limits 7∼16 0∼VCC / 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 Cτ2 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 Cτ 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 Cτ2 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 Cτ 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 = 25°C, 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 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 µA V V µA µA 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 − − RL (load)=9Ω, RO (current detector)=0.6Ω RL (load)=9Ω, RO (current detector)=0.6Ω Forward mode Reverse mode Brake mode Stop mode 12, 13 open 17, 18pin open ∗1 RL (load)=9Ω RO (current detector)=0.6Ω VIN2=2.5V 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 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 10µF 2 F2 II2 R2 3 SW-3 1 3 2 1 0.6Ω 9Ω A 1 2 Vr2 SW-2 A IF2 A IR2 V VO 2 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 V O1 1 2 IL1 SW-4 A Vr1 F1 R1 VCC Fig.1 BA6780 / BA6780FP-Y Optical disc ICs BA6780FP-Y VIN 10µF 2 F2 II2 R2 3 SW-3 A 1 2 1 3 Vr2 SW-2 2 1 0.6Ω 9Ω 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 V O1 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 V O1 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 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 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 V O2 ∗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 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=0.6Ω 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 µ-COM Fig.3 BA6780 / BA6780FP-Y Optical disc ICs BA6780FP-Y RF-500TB VEE M VEE VEE Rdet=0.6Ω 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 µ-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 × 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 Operation 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 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= ∞ 20Ω 16Ω 12Ω 8Ω 10 V VO 8 6 4 2 0 −2 −4 −6 −8 External Vref RL RL = ∞ 20Ω 16Ω 12Ω 8Ω FWDmode 4 2 0 −2 −4 −6 −8 VCC+5V VIN Filter LOGIC Internal Vref RL 0.6Ω 1.0 2.0 3.0 4.0 REVmode 5.0 V VO 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) 8Ω 12Ω 16Ω 20Ω ∞ 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=0.6Ω Rdet=30kΩ 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