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L7203 Datasheet(PDF) 2 Page - STMicroelectronics |
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L7203 Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 13 page SMOOTH DRIVING concept. It is based on the idea of driving the motor wind- ing through 3 sinusoidal voltages dephased of 120 degrees. The motor is controlled in voltage mode, so no current control compensation net- work is required. Each profile is digitally described by 36 bytes stored in a ROM memory. These sinusoidal signals are modulated by multi- plying each sample by a value stored in the KVAL register. Using this kind of profiles it is possible to obtain great advantages such as torque ripple and acoustic noise reduction and lower EMI. An easier track following is ensured, since vibration are reduced. The clock signal on the chip can be synchronized to the external application clock signal. An internal circuit can limit the current. The threshold is fixed with a internal 0.2 V reference. The device generates: - a current generator to define output voltage slew rate - a 3.3 V reference to bias hall sensor. - the HFG open drain output signal for speed regulation. The device includes : - a circuit for thermal shutdown with hysteresis. - a low voltage detector In the STANDBY state the main functions of the device are turned off, in order to minimize the power consumption. The STANDBY state of the device is imposed by: - Thermal shutdown - stand by signal from µP PIN CONNECTIONS DESCRIPTION (continued) PRS N.C. N.C. VM U N.C. V W RF H BIAS ISR VCC DGND AGND SRC HFG FSYS STB 1 3 2 4 5 6 7 8 9 22 21 20 19 18 16 17 15 23 10 24 N.C. PHS D01IN1174 RF1 PWMIN 11 14 13 12 H+ H- STB PRS VM U V RF W RF1 H+ PHS HBIAS ISR AGND VCC DGND SRC HFG FSYS 1 3 2 4 5 6 7 8 9 18 17 16 15 14 12 13 11 19 10 20 H- PWMIN D98IN928A SO20 SSO24 L7203 2/13 |
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