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ZTL432AFFTA Datasheet(PDF) 7 Page - Zetex Semiconductors |
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ZTL432AFFTA Datasheet(HTML) 7 Page - Zetex Semiconductors |
7 / 12 page ZTL431, ZTL432 Issue 8 - April 2007 7 www.zetex.com © Zetex Semiconductors plc 2007 DC test circuits Notes Deviation of reference input voltage, Vdev, is defined as the maximum variation of the reference input voltage over the full temperature range. The average temperature coefficient of the reference input voltage, Vref is defined as: The dynamic output impedance, Rz, is defined as: When the device is programmed with two external resistors, R1 and R2, (fig 2), the dynamic output impedance of the overall circuit, R'z, is defined as: Stability boundary The ZTL431 and ZTL432 are stable with a range of capacitive loads. A zone of instability exists as demonstrated in the typical characteristic graph on page 5. The graph shows typical conditions. To ensure reliable stability a capacitor of 4.7nF or greater is recommended between anode and cathode. Figure 1 Test circuit for VKA = VREF Figure 2 Test circuit for VKA > VREF Figure 3 Test circuit for off state current IKA IKA IKA(OFF) IL IL VKA VKA VKA VREF VREF IREF IREF V REF ppm°C () V DEV 1 000 000 ,, × V REF T1 T2 – () ------------------------------------------------- = R z ΔV z ΔI z ---------- = R' z R z 1 R1 R2 ------- + ⎝⎠ ⎛⎞ = |
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