Datasheet NCP431 (ON Semiconductor) - 5

NCP431A, SC431A, NCP431B, SC431B, NCP432B, SC432B Series
Input VKA Input V KA Input V KA IK Ioff R1 Iref IK Vref R2 Vref R1 V ǒ Ǔ KA + Vref 1 ) I R2 ref @ R1
Figure 3. Test Circuit for VKA = Vref Figure 4. Test Circuit for VKA > Vref Figure 5. Test Circuit for Ioff
150.0 60.0 V V KA = Vref KA = Vref T T A = 25°C A = 25°C Input VKA 40.0 100.0 mA) Input VKA I I Min I K K 20.0 50.0 0.0 0.0 −20.0 THODE CURRENT (mA) THODE CURRENT ( , CA −50.0 , CA I K −40.0 I K −100.0 −60.0 −1.0 0.0 1.0 2.0 3.0 −1.0 0.0 1.0 2.0 3.0 VKA, CATHODE VOLTAGE (V) VKA, CATHODE VOLTAGE (V)
Figure 6. Cathode Current versus Cathode Figure 7. Cathode Current versus Cathode Voltage Voltage
80.00 70.00 60.00 50.00 mA) , ( 40.00 I MIN 30.00 20.00 10.00 0.00 −50 −25 0 25 50 75 100 125 TA, AMBIENT TEMPERATURE (°C)
Figure 8. Minimum Cathode Current Regulation versus Ambient Temperature www.onsemi.com 5