BA6392FP

Optical disc ICs 4-channel BTL driver for CD players BA6392FP The BA6392FP is a 4-channel BTL driver for CD player motors and actuators. It has an internal primary filter, and can be directly connected (without attached components) to the servo PWM output of all drivers other than the spindle driver. The BA6392FP is pin compatible with the BA6297AFP. FApplications CD players, CD-ROM drives FFeatures 1) HSOP 28-pin package allows for miniaturization of applications. 2) PWM input is filtered by the internal primary filter, eliminating the need for attached resistors and capacitors, thereby helping reduce the number of components. Resistor and capacitor time constants can also be changed with attached components. 3) Internal thermal shutdown circuit. 4) Internal mute circuit. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 324 Optical disc ICs FBlock diagram BA6392FP 325 Optical disc ICs FPin descriptions BA6392FP 326 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, f = 1kHz, RL = 8Ω) BA6392FP 327 Optical disc ICs FInput / output circuits BA6392FP FCircuit operation (1) Fig. 3 shows the inputs from the digital servo IC for CH1-CH3 drivers (all drivers except the spindle). SW1 is on when the forward input signal (HIGH level, over 2.4V) is present. SW2 is on when the reverse input signal is present (Fig. 2) The constant current (I1) at this time enters the RC and generates an integral ...