BA6780 Rohm, BA6780 Datasheet
BA6780
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BA6780 Summary of contents
Page 1
... 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. ...
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... 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 BA6780 / BA6780FP-Y FBIN OUT2 OUT2 12 11 ...
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... 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 BA6780 / BA6780FP-Y FBIN FBIN OUT2 OUT2 18 ...
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... Optical disc ICs Input / output circuits ( ( ) :pins for BA6780FP-Y ) Pin function ( pin4 Logic input pin1 pin2 Voltage setting input For connection of capacitor for PWM filter pin13 ( pin18 ) Load current detector V Equivalent circuit 85k pin 2, 3, 16, 17 24k V EE 24k V EE ...
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... Optical disc ICs Pin function Output (reversible driver) Output (governor) Load current detector signal output (governor) Equivalent circuit V CC 10k pin8 pin11 10k pin10 pin14 pin4 ( pin6 ) BA6780 / BA6780FP-Y ...
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... Output load fluctuation V OUT <4.6V constant-voltage output> Output voltage V reg Output load fluctuation (source) V OSO Output load fluctuation (sink) V OSI Not designed for radiation resistance. = 10V BA6780FP-Y) CC Min. Typ. Max. Unit 8.0 16.0 mA Open mode with no load 3.5 V Mute on voltage when V 5.5 ...
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... FWD/REV CONTROLLER SW IF1 1 A IL1 Vr1 IR2 10k DETECTOR 10k 10k 40k 40k OUT Vref Vconst IR1 V Vreg R1 Fig.1 BA6780 / BA6780FP SW DRIVE BUFFER 10k 10k 10k Vref 10k 10k 10k 3.2k Vref Vref Vref Vref 20k DRIVE BUFFER 17. ...
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... IF1 1 A IL1 Vr1 F1 R2 SW-3 IR2 10k 40k 40k OUT Vref Vconst Ireg IR1 V Vreg R1 Fig.2 BA6780 / BA6780FP 0 SW DRIVE BUFFER 10k 10k 10k 10k 10k 10k 10k 10k 10k Vref 3.2k 10k Vref Vref Vref Vref 20k DRIVE BUFFER 17 ...
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... BA6780 / BA6780FP-Y Conditions IL1 swept down from 10V V swept from 0V 1 Check for abnormality output in Vr1 and Vr2 input range Sweep the F/R input and check that the mode switching is occurring in a range that satisfies 2 2 the rated values 5 5 ...
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... SHUT DOWN REVERSIBLE DRIVER FWD/REV CONTROLLER -COM DETECTOR 10k 40k 40k OUT Vref Rreset V DD GND Fig.3 BA6780 / BA6780FP-Y RF-500TB M Rdet=0 DRIVE BUFFER 10k 10k 10k 10k Vref 10k 10k 10k 3.2k 10k Vref Vref Vref 20k DRIVE BUFFER 17. Vconst 10k ...
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... REVERSIBLE DRIVER FWD/REV CONTROLLER -COM 40k 40k OUT Vconst Vref Rreset V DD GND Fig.4 BA6780 / BA6780FP-Y RF-500TB M Rdet=0 DRIVE BUFFER 10k 10k 10k 10k 10k 10k 10k 10k 10k 10k Vref 3.2k 10k Vref Vref Vref Vref EE 20k DRIVE BUFFER 17. ...
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... DET RESET V RESET I DET 4 pin6 (BA6780FP-Y). Mode OUT ( ) Forward mode Reverse mode L L Brake mode OPEN Open mode Mode OUT ( ) Forward mode H L Reverse mode L H Brake mode / OPEN Open mode RESET RESET BA6780 / BA6780FP-Y value is determined as follows : ...
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... 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 (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 (V ...
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... V Vref SUPPLY VOLTAGE : Fig.9 Internal Vref output characteristics BA6780FP-Y 13.6 ± 0.2 2.75 ± 0.1 25 7.62 1 1.95 ± 0.1 0.8 0.36 ± 0 HSOP25 BA6780 / BA6780FP 1516 SUPPLY VOLTAGE : V CC Fig.10 4.6V constant-voltage source output voltage characteristics 14 13 0.3Min. 0.15 I =0mA ...