Datasheet AP431 (Diodes) - 4

NOT RECOMMENDED FOR NEW DESIGN USE AS431 AP431/AP431A Electrical Characteristics
(cont.) (@TA = +25°C, VDD = 3V; unless otherwise specified.) VMAX V = V - V DEV MAX MIN VMIN T1 Temperature T2 Note: 6. Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference over the full temperature range. The average temperature coefficient of the reference input voltage αVREF is defined as: D V EV 6 ( ) ⋅10 ° R V EF(25 C) = ……………………..………..…………….. ( ppm R V α EF − ) C ° 2 T 1 T Where: T2 – T1 = full temperature change. αVREF can be positive or negative depending on whether the slope is positive or negative. Note: 7. The dynamic output impedance, RZ, is defined as: ∆ KA V Z = KA ∆ KA I When the device is programmed with two external resistors R1 and R2 (see Figure 2.), the dynamic output impedance of the overall circuit, is defined as: ' v ∆ R1 Z = ≈ Z (1+ ) KA KA i ∆ R2
Test Conditions
Input IN IN I V KA KA V V KA I KA KA R1 IREF I R2 V Z(OFF) V REF REF Note: V = V (1 + R1/R2) + I xR1 KA REF REF Figure. 1 Test Circuit for V = V KA REF Figure. 3 Test Circuit for Off-State Current Figure. 2 Test Circuit for V > V KA REF AP431/AP431A 4 of 17 September 2014 Document number: DS31002 Rev. 21 - 2
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