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L7250 Datasheet(PDF) 1 Page - STMicroelectronics |
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L7250 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 46 page 1/46 L7250 July 2001 This is preliminary information on a new product now in development. Details are subject to change without notice. s 12V & 5V (±10%) OPERATION s REGISTER BASED ARCHITECTURE s 3 WIRE SERIAL COMMUNICATION INTERFACE UP TO 33 MHZ s BCD TECHNOLOGY Spindle Motor Controller s INTERNAL POWER DEVICE 0.9 OHM MAX VALUE @ 125°C (SINK+SOURCE) s 2.5A PEAK CURRENT CAPABILITY s ST SMOOTHDRIVE SINUSOIDAL PWM COMMUTATION s DEDICATED ADC FOR POWER SUPPLY VOLTAGE COMPENSATION s SPINDLE CURRENT LIMITING VIA FIXED FREQUENCY PWM OF SPINDLE POWER OUTPUTS AT THE SMOOTHDRIVE PWM RATE s SYNCHRONOUS RECTIFICATION DURING PWM TO REDUCE POWER DISSIPATION s CURRENT SENSING VIA EXTERNAL CURRENT SENSE RESISTOR s INDUCTIVE SENSE POSITION START UP DRIVEN BY µPROCESSOR s SPINDLE BRAKING DURING POWER DOWN CONDITION Voice Coil Motor Driver with Ramp Load/Unload s INTERNAL POWER DEVICE 0.9 OHM MAX VALUE @ 125°C (SINK+SOURCE) s 2A PEAK CURRENT CAPABILITY s 15 BIT LINEAR DAC FOR CURRENT COMMAND, WITH INTERNAL REFERENCE VOLTAGE s SENSE AMPLIFIER GAIN SWITCH s CLASS AB OUTPUT STAGE WITH ZERO DEAD-BAND AND MINIMAL CROSSOVER DISTORTION s RAMP LOAD AND UNLOAD CAPABILITY AS WELL AS CONSTANT VOLTAGE RETRACT s EXTERNAL CURRENT SENSE RESISTOR IN SERIES WITH MOTOR. s HIGH CMRR (>70DB) AND PSRR (>60DB) SENSE AMP s EXTERNAL CURRENT CONTROL LOOP COMPENSATION s HIGH BANDWIDTH VCM CURRENT CONTROL LOOP CAPABILITY s HIGH PSRR, LOW OFFSET, LOW DRIFT GM LOOP s VCM VOLTAGE MODE, CONTROLLED BY VCM DAC s GM LOOP OFFSET CALIBRATION SCHEME INCLUDES A COMPARATOR ON THE ERROR AMP Auxiliary Functions s 3.3V AND 1.8V LINEAR REGULATOR CONTROLLER s NEGATIVE VOLTAGE REGULATOR s INTERNAL ISOFET 0.1 OHM @125C s POWER MONITOR OF 12V, 5V, 3.3V AND 1.8V s SHOCK SENSOR CIRCUIT TAKES INPUTS FROM PIEZO OR CHARGING ELEMENT s 10 BIT ADC WITH 4 MUXED INPUTS s THERMAL SENSE CIRCUIT AND OVER TEMPERATURE SHUT DOWN s CHARGE PUMP BOOST VOLTAGE GENERATOR FOR HIGH SIDE GATE DRIVE s ANALOG PINS AVAILABLE TO ENTER SIGNALS TO BE CONVERTED BY THE INTERNAL ADC DESCRIPTION L7250 is a power IC for driving the SPINDLE and VCM motors, suitable for 5V & 12V application. The spindle system includes integrated power FETs which are driven using ST's Smoothdrive pseudo-si- nusoidal commutation technology. The voice coil mo- tor (VCM) system includes integrated power FETs, as well as ramp load and unload capability. Linear 3.3V and1.8V voltage regulators are included, as well as a negative regulator. Power monitoring of VCC5, VCC12, and of the two positive voltage regulators is also included.L7250 uses a 3 wire serial interface: S_DATA, S_CLK and S_ENABLE TQFP64 ORDERING NUMBER: L7250 PRODUCT PREVIEW 5V & 12V SPINDLE AND VCM MOTORS DRIVER |
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