FAN8082 데이터 시트보기 (PDF) - Fairchild Semiconductor
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FAN8082 Datasheet PDF : 12 Pages
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BI-DIRECTIONAL DC MOTOR DRIVER
Application Information
1. Thermal Shut Down Circuit
I
Q1
V1
R1
V2
R2
Q2
Q3
When Ta = 25°C, Q2 & Q3 are Turned-off and output stage operates normally.
V1 = I × (R1 + R2)
V2 = R2 / (R1 + R2) × V1 = 0.37V
When Ta = 165°C, Q2 & Q3 Turn-on and it turns-off the output stage.
0.70V - 0.37V = 330mV (When Q2 & Q3 are Turn-on, VbeQ2 = VbeQ3 = 0.70V)
And temperature coefficient of Q2 = Q3 = −2mV / °C
∴ T.S.D: 330mV / 2mV = 165°C
2. Logic Input & Output Table
Input
Pin #4
Pin #5
Low
Low
High
Low
Low
High
High
High
INPUT High is above 2.0V.
INPUT Low is below 0.7V.
*Low : All Power TRs are off-state.
But internal Bias makes output Voltage low state.
Pin #2
*Low
High
Low
*Low
Output
Pin #8
*Low
Low
High
*Low
Motor
Standby
Forward
Reverse
Brake
6
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