Optical disc ICs 2-channel BTL driver for CD players BA6792FP / BA6792FP-Y The BA6792FP and BA6792FP-Y are 2-channel BTL drivers for CD player actuator drives. HSOP 28 and 25-pin packages allow for compact applications. Applications CD players and CD-ROM drives Features 1) 2 channel dedicated BTL drivers. 2) HSOP 28 and 25-pin power packages for compact applications. Absolute maximum ratings (Ta = 25C) Recommended operating conditions (Ta = 25C) 202 3) Gain is adjustable with an attached resistor. 4) Internal thermal shutdown circuit. Optical disc ICs BA6792FP / BA6792FP-Y Block diagram Pin descriptions (BA6792FP) 203 Optical disc ICs Pin descriptions (BA6792FP - Y) 204 BA6792FP / BA6792FP-Y Optical disc ICs BA6792FP / BA6792FP-Y Pin equivalent circuit diagrams Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 8V, f = 1KHz, RL = 8Ω) 205 Optical disc ICs Measurement circuit 206 BA6792FP / BA6792FP-Y Optical disc ICs BA6792FP / BA6792FP-Y Application example (BA6792FP) Operation notes (1) The BA6792FP and BA6792FP-Y have an internal thermal shutdown circuit. The output current is muted when the chip temperature rises above 175C (typically). The driver circuit is restored when the chip temperature rises above 150C (typically). (2) The output current can be muted by opening the mute pin voltage or lowering it below 0.5V. This pin should be pulled up above 2.0V during normal operation. (3) Muting also occurs when the bias pin voltage drops below 1.4V (typically). This pin should stay above 2.0V during normal operation. (4) Muting occurs during thermal shutdown, mute-on operations or a drop in the bias pin voltage. In each case, only the drivers are muted. During muting, the output pins remain at the internal bias voltage, roughly (VCC / 2). (5) Attach a bypass capacitor (roughly 0.1µF) between the power supplies, at the base of the IC. (6) The radiating fin is connected to the package’s internal GND, but should also be connected to an external ground. 207 Optical disc ICs Electrical characteristic curves External dimensions (Units: mm) 208 BA6792FP / BA6792FP-Y