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AS8410 Datasheet(PDF) 8 Page - ams AG |
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AS8410 Datasheet(HTML) 8 Page - ams AG |
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8 / 19 page  PWM DC Motor Regulator – Data Sheet AS8410 Rev. 1.0, December 2000 page 8 of 19 Meaning and Settings of the external devices Sym- bol Description Typical value Application Note Regulation loop settings / slew rate regulation ROSC Resistor of the refer- ence current genera- tion Iref 100 k Ω The voltage at the pin OSC is regu- lated to VOSC = 1 V. The reference cur- rent is therefore 10 µA. This current is used for three functions: 1. The oscillator frequency (Iref = 10 µA generates fOSC = 18 kHz, fOSC is a linear function of Iref) 2. Generation of the internal set value voltage in OM1 together with the resistor Rint2. 100% set value is build by a volt- age of 2 V at pin Cint2: VCint2(100%) = Iref * Rint2 = 2 V 3. Reference current for the power FET driver / Slew rate regulation (linear function between Iref and driver output current IOUT) Rmeas Motor current meas- urement resistor Dependent on the nominal motor current Imotor_nom The voltage drop over the Rmeas must be 50 mV for the nominal motor cur- rent: Rmeas = 50 mV / Imotor_nom Rint2 Resistor to convert the incoming duty ratio of the set value in OM1 to the set value voltage VCint2 200 k Ω VCint2(100%) = Iref * Rint2 = 2 V Cint2 Filter capacitor of the set value conversion in OM1 > 2.2 µF Dependent on the incoming PWM fre- quency fIN_PWM fIN_PWM = 10 Hz à Cint2 > 2.2 µF Cint1 Capacitor to set the regulation loop time constant and failure handling time con- stant 100 nF The time constant of the failure han- dling Tfail is determined by the max. current at pin Cint2 (ICint1_max = 10 µA … 15 µA) and the min. voltage to start the PWM generator (1.66 V): Tfail = (Cint1 * 1.66 V ) / ICint1_max SRC1 SRC2 Feedback circuitry of the slew rate regula- tion Dependent on the application (motor and environment) Application Support of Austria Mikro Systeme AG will be guaranteed Protection Resistors RIN Protection resistor of the pin IN 330 Ω Needed in automotive applications RMODE Protection resistor of the pin MODE 1 k Ω Needed in automotive applications Temperature Sensor RTP1 RTP2 Resistor divider of the temperature sensor RTP1 + RTP2 < 10 k Ω The threshold voltage at the pin TP must be 0.5 *VDD or (RTP1 = RTP2) |
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