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S8082 Datasheet(PDF) 5 Page - KODENSHI_AUK CORP. |
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S8082 Datasheet(HTML) 5 Page - KODENSHI_AUK CORP. |
5 / 12 page KSD-I7F014-003 5 SEPT., 2010 REV. 03 1ch Bi-directional Motor Driver Application Information 1. Thermal Shut Down Circuit The built-in thermal shutdown circuit mutes the output current when the chip temperature reaches 175℃ (typ.). The hysteresis is set to 25℃ (typ.) by IHys, so the circuit will start up again when the chip temperature falling down to 150℃ (typ.) When Ta = 25℃, Q2 & Q3 are turned-off [ Output Stage : Normality Operation ] V1 = I×(R1+R2) V2 = R2÷(R1+R2)×V1 = 0.385V When Ta = 175℃, Q2 & Q3 are turned-on [ Output Stage : Shut Down ] 0.700V – 0.385V = 315mV [ Vbe level of Q2 & Q3 : 0.700V / Temperature Coefficient of Q2 = Q3 = -1.8mV/℃ ] ◈ T.S.D : 315mV÷1.8mV = 175℃ I Q1 Q3 Q2 R1 R2 V1 V2 Output Stage [ Vo1, Vo2 ] S8082 |
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