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| Optical disc ICs 2-channel driver for CD changers BA6780 The BA6780 is a 2-channel driver IC for CD changers that includes a reversible, variable speed electronic governor and a reversible driver. On sets that have dual-rail power supplies, the BA6780 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. FApplications Changers for CD players and MD players. FFeatures 1) Output voltage can be freely set using the output voltage setting pin. 2) Internal mute function if the power supply voltage drops. 3) 4) 5) 6) Thermal shutdown function. PWM input. Settable reference voltage output pin. Wide operating supply voltage range. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 550 Optical disc ICs FBlock diagram BA6780 FPin descriptions 551 Optical disc ICs FInput / output circuits BA6780 552 Optical disc ICs BA6780 553 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 10V) BA6780 554 Optical disc ICs FMeasurement circuit BA6780 555 Optical disc ICs FMeasurement circuit switch table BA6780 556 Optical disc ICs BA6780 FApplication example 557 Optical disc ICs FInput / output truth table Reversible drive BA6780 Governor drive FUsing 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 3.2k VRESET = VDD*IDET IO RDET RRESET 3.2k RRESET NVRESET = VDD * (RDET is the load current detector resistance, refer to the application circuit) 558 Optical disc ICs FOperation notes (1) The BA6780 has a built in thermal shutdown circuit that mutes 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 the VEE level, and the governor driver is set to the VEE / 2 level. BA6780 (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 ) 5.0)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. FElectrical characteristics curves 559 Optical disc ICs BA6780 FExternal dimensions (Units: mm) 560 |
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