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L6243 Datasheet(PDF) 7 Page - STMicroelectronics |
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L6243 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 12 page BLOCK DESCRIPTION OUTPUT STAGE It consists of two Power Op Amps connected in bridge configuration. CURRENT SENSE AMPLIFIER Differential amplifier whose inputs are connected to the sense lines and whose output is accessible externally. Closing the loop will transform the differential voltage signal from the sense lines into a current signal for the Error Amplifier. ERROR AMPLIFIER Error amplifier which drives the output stage. The input and the output pins are accessible exter- nally. POWER SUPPLY MONITOR OPERATION The circuit monitors the logic supply voltage input (typ 5V) and activates Power on Reset and Write Disable output when such a supply drops below the safe operating limit. After the logic supply volt- age reaches its nominal value a delay capacitor has to be charged [Tdelay=3x10e5 x C sec] be- fore Power on Reset and Write Disable outputs change from low to high level. Falling edges of Write Disable and Power on Reset are delayed (typ 4 µs) in order to disable the writing on the disk before the Power on Reset is activated. An addi- tional supervisor circuit is present in the IC with a programmable threshold, which is set by an exter- nal resistive divider. The TTL compatible output can be used separately or connected to Park in- put in order to park the head. The VCC sense output pin can also be connected to 5V filter input in order to implement a POWER ON RESET function sensitive both to 5V and VCC. PARKING CIRCUIT OPERATIONT The voice coil driver is switched into the parking condition when Power on Reset output or Park in- put are low. In such a condition a fixed voltage is superimposed on the load and the value of such a voltage is set by connecting an external resistor between Park Voltage Program input and ground: (Vpark=Rext x Iref, Iref=100 µA typ). Con- necting ENABLE input to GND the driver will be disabled (outputs in high impedance mode). THERMAL SHUTDOWN It will disable the IC when the junction tempera- ture exceeds the threshold value above which the device could be damaged. Figure 1: Application Circuit (The pinout refers to the L6243) L6243-L6243D 7/12 |
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