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| Optical disc ICs 4-channel BTL driver for CD player and CD-ROM drives BA5921FP The BA5921FP is an IC with an internal 4-channel BTL driver for CD players and CD-ROM driver actuators and motors, as well as an internal standard operational amplifier. In addition, the 28-pin HSOP package allows for application miniaturization. FApplications CD players, CD-ROM drives FFeatures 1) 4-channel BTL driver. 2) HSOP 28-pin power package allows for application miniaturization. 3) Wide dynamic range. (typically 3.6V when VCC = 5V and RL = 8) 4) 5) 6) 7) Internal thermal shutdown circuit. Gain is adjustable with an attached resistor. Internal standard operational amplifier. Output current is mutable with an external mute pin. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 269 Optical disc ICs FBlock diagram BA5921FP FPin descriptions 270 Optical disc ICs FPin equivalent circuit diagrams BA5921FP 271 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V, BIAS = 2.5V, RL = 8) BA5921FP 272 Optical disc ICs FMeasurement circuit BA5921FP 273 Optical disc ICs FMeasurement circuit switch table (1) Driver (OPIN!1, NF!1, OPRL!1, VOPIN = 2.5V) BA5921FP (2) Operational amplifier (RL!OFF) 274 Optical disc ICs FApplication example BA5921FP 275 Optical disc ICs FOperation notes (1) The BA5921FP has a thermal shutdown circuit. The output current is muted when the chip temperature rises above 175_C (typically). When the chip temperature falls to 150_C (typically), the driver circuit starts up again. (2) The output current can be muted by opening the mute pin (pin 9) or lowering it below 0.5V. During ordinary use, pin 9 should be pulled up above 2.0V. (3) Muting also occurs when the bias pin (pin 2) drops below 1.4V (typically). Make sure it stays above 1.7V during normal use. BA5921FP (4) The internal circuits turn off when the supply voltage drops below 3.8V (typically), and turn on again when it rises above 4.0V (typically). (5) Muting occurs during thermal shutdown, mute-on operations or a drop in the bias pin voltage or supply voltage. In each case, only the drivers are muted. During muting, the output pins remain at the internal bias voltage, roughly (VCC*VF) / 2. (6) Connect the IC to a 0.1F bypass capacitor between power supplies, at the base of the IC. (7) The radiating fin is connected to the package's internal GND, but should also be connected to an external ground. FElectrical characteristic curves 276 Optical disc ICs FExternal dimensions (Units: mm) BA5921FP 277 |
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