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L7203 Datasheet(PDF) 1 Page - STMicroelectronics |
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L7203 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 13 page SMOOTH DRIVE ™ SYSTEM 1.8A DRIVE PEAK CAPABILITY SLEW RATE CONTROL INDUCTIVE SENSE START-UP ROUTINE THERMAL SHUTDOWN SUITABLE FOR 5V AND 12V APPLICATION ONLY ONE HALL SENSOR IS REQUIRED DESCRIPTION The L7203 SPINDLE MOTOR IC includes a three phase brushless spindle motor controller and the power stage in switching mode. The device is de- signed for both 5V and 12V OPTICAL DRIVE ap- plication requiring up to 1.8A peak of current. The device is realized in BCD5, a 0.7 µm Mixed technology. The spindle motor position detection is carried out by means of a single comparator with hyster- esis. In the start-up phase the "inductive sense start up method" is used to detect the rotor posi- tion, determining the direction of starting rotation. This procedure is implemented by a logic circuit on chip. The device applies three sinusoidal voltages to the motor coils. This is obtained through the application of the April 2001 LOW VOLTAGE DETECTOR PRS SRC AGND DGND BLOCK DIAGRAM ORDERING NUMBERS: L7203 (SO20) L7203S (SSO24) L7203 SMOOTH DRIVE SPINDLE MOTOR FOR OPTICAL DRIVE APPLICATION WITH POWER INTEGRATED ® SO20 SSO24 1/13 |
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