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L6246 Scheda tecnica(PDF) 1 Page - STMicroelectronics |
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L6246 Scheda tecnica(HTML) 1 Page - STMicroelectronics |
1 / 12 page L6246 12V VOICE COIL MOTOR DRIVER 12V ( ±10%) OPERATION 3A MAXIMUM CURRENT CAPABILITY 0.3 Ω MAXIMUM ON RESISTANCE OF EACH POWER DMOS AT A JUNCTION TEM- PERATAURE OF 25 °C CLASS AB POWER AMPLIFIERS LOGIC AND POWER SUPPLY MONITOR POWER ON RESET PARKING FUNCTION WITH SELECTABLE RETRACT VOLTAGE AND DYNAMIC BRAKE BEFORE PARKING ENABLE FUNCTION GATE DRIVER FOR EXTERNAL BLOCKING N-MOSFET OVERTEMPERATURE PROTECTION OVERTEMPERATURE WARNING OUTPUT PQFP44 PACKAGE DESCRIPTION The voice coil driver L6246 is a linear power am- plifier designed to drive single phase bipolar DC motors for hard disk drive applications. The de- vice contains a selectable transconductance loop, which allows high precision for head positioning. The power stage is composed of 2 power amplifi- ers, in AB class, with 4 DMOSs, with Rdson of 0.5 Ω (Sink+Source) maximum, in a H-bridge con- figuration. Drive voltage for the upper DMOS FETs is provided by a charge pump circuit to en- sure low Rdson. Automatic brake and parking of the head actuator is performed by logic or when a failure condition is detected by power supply monitors. An external resistor programs the parking voltage that en- ables the head retract. In addition, a 5V stable output is provided for the external usage, and a gate driver circuit enables an external power sup- ply isolation N-MOSFET. This device is built in BCD II technology allowing dense digital circuitry to be combined with high power bipolar power devices and is assembled in PQFP44. February 1998 PQFP44 (10x10) MULTIPOWER BCD TECHNOLOGY 1/12 |
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