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1470 Datasheet(PDF) 4 Page - Unisonic Technologies |
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1470 Datasheet(HTML) 4 Page - Unisonic Technologies |
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4 / 5 page  UTC1470 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO. LTD 4 QW-R109-007,B BASIC EQUATION FOR MOTOR M Vcc Em im RT RS 1 3 2 4 Et i2 i4 1470 Et= Vref + RT( i2 + Vref Rs ) i2= 1 K i4 + iq i4= im + Vref Rs 1 K i4+iq + Vref Rs ) Et= Vref + RT { 1 K ( im+ Vref Rs )+ iq + Et= Vref { 1 + RT Rs ( 1+ 1 K + RT iq + im They also give : Em = Eo + Rm im Eo = Vref {1 + ( 1+ }+ RT iq Eo : Back Electromotive Force Rm: internal Resistance(of the Motor) K : Reflection Confficient = ( i4 / i2 ) ﹙ Et = Vref + RT ( ) Vref Rs } RT K } RT Rs 1 K Rm = RT K APPLICATION CIRCUIT 1 2 4 3 Vref STARTING CIRCUIT COMPARATOR CURRENT MILLOR M Vcc L RT RS Motor (47μH) Vcc = 12V Rm = 19.5Ω RT = 330Ω Rs = 1kΩ Eo = 2.3V K = 20 Note 1.The motor speed can be adjusted by the varisble resistor RS. Note 2. If RTmax.> k * Rm min,instabilicy of the motor may occur. Rsmin.= Vref * RT Eo - Vref- Iq*RT |
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