BA6297AFP

Optical disc ICs 4-channel BTL driver for CD players BA6297AFP The BA6297AFP is a 4-channel BTL driver for CD player actuators and motors. The preamplifier has both positive and negative input pins and output pins, making this IC suited to a broad range of applications. FApplications CD players FFeatures 1) 4-channel BTL driver. 2) HSOP 28-pin package allows for miniaturization of applications. 3) Internal thermal shutdown. 4) Driver gain is adjustable with a single attached resistor. 5) Both positive and negative input pins, for adaptability for a wide range of inputs (including negative phase input). FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 318 Optical disc ICs FBlock diagram BA6297AFP FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, f = 1kHz, RL = 8Ω) 319 Optical disc ICs FElectrical characteristic curves BA6297AFP 320 Optical disc ICs FMeasurement circuit BA6297AFP 321 Optical disc ICs FCircuit operation The BA6297AFP comprises a 4-channel driver, internal bias amplifier, mute pin and thermal shutdown. (1) Driver The driver uses a buffer to output one of the outputs from its preamplifier with no modification, and uses an inversion amplifier to invert the other output before sending it to the driver buffer. The inversion amplifier’s reference is the bias voltage generated internally (pin 7 voltage), and so the preamplifier output must make the zero level equal to the internal bias voltage...