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L6256 Fiches technique(PDF) 2 Page - STMicroelectronics |
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L6256 Fiches technique(HTML) 2 Page - STMicroelectronics |
2 / 28 page constant torque. This is a very high power dissi- pation mode, meant only for momentary opera- tion in unusual circumstances. Spindown during a power failure uses the back EMF voltage generated by the spindle motor to provide power to the VCM amplifier. The Spindle motor coasts during the Brake Delay time to allow time to park the head actuator. The park circuit is a constant voltage circuit settable externally. After the head is parked, braking commences. The brake operates by shorting all 3 windings. The spindle output stages stay on as long as is required to bring the motor to a complete stop, even if no power is applied to the part. A Power On Reset (POR) function provides pulse stretching for the bidirectional POR\ bus, to en- sure that the processor and clocks are at running speed before allowing them to function. 5 volt and 12 volt pins are used directly for the un- dervoltage detect circuit. This allows direct use internally of both supplies. Voltage monitor margining is supported. An external 3.3V linear regulator is provided and tied into the POR circuit. ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VPWR Normal Operating Voltage 15 V VPVR Inductive Clamp Voltage @ 2mH, 1.6A, 3% Duty Cycle <20 V (1) Vdd 15 V VCC 6.4 V I_VCM, Aout -2 to VPWR +2V Logic I/O, SH_Out, PWM_DC -0.3 to VCC +0.3 All other pins -0.3 to VPWR +0.3V Tstg Storage Ambient Temperature -65 to +150 °C ESD capability ±2kV (1) Limited by chip clamp voltage. 1 2 3 5 64 7 8 9 10 12 11 13 14 15 16 17 39 38 37 36 34 35 33 32 31 30 29 40 41 42 44 43 23 22 21 19 18 20 28 27 26 24 25 GND R_SLEW POR_RC nPOR BEMF_DET PWM_IN SCLK SDIO VCC BYPASSC 5V_GND GND SH_OUT FF_COMP PWM_DC VDD REF_IN H_VPWR DAC IO_VC A_IN GND D97IN572 PIN CONNECTION OPERATING CONDITIONS VCC = 4.5 to 5.5V Vdd = 10.8 to 13.2V 0°C < Tamb < 70°C. DESCRIPTION (Continued) L6256 2/28 |
Numéro de pièce similaire - L6256 |
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Description similaire - L6256 |
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