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HA17431VPJ Datasheet(PDF) 11 Page - Renesas Technology Corp |
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HA17431VPJ Datasheet(HTML) 11 Page - Renesas Technology Corp |
11 / 18 page HA17431VPJ/PJ/PAJ/FPJ/FPAJ/PNAJ/UPA, HA17432UPA REJ03D0892-0100 Rev.1.00 Apr 03, 2007 Page 11 of 17 Application Examples As shown in the figure on the right, this IC operates as an inverting amplifier, with the REF pin as input pin. The open- loop voltage gain is given by the reciprocal of “reference voltage deviation by cathode voltage change” in the electrical specifications, and is approximately 50 to 60 dB. The REF pin has a high input impedance, with an input current Iref of 3.8 µA Typ (V version: Iref = 2 µA Typ). The output impedance of the output pin K (cathode) is defined as dynamic impedance ZKA, and ZKA is low (0.2 Ω) over a wide cathode current range. A (anode) is used at the minimum potential, such as ground. K VCC OUT VEE A REF VZ ≅ 2.5V – + Figure 1 Operation Diagram Application Hints No. Application Example Description 1 Reference voltage generation circuit K R CL Vout GND Vin GND REF A This is the simplest reference voltage circuit. The value of the resistance R is set so that cathode current IK ≥ 1 mA. Output is fixed at Vout ≅ 2.5 V. The external capacitor CL (CL ≥ 3.3 µF) is used to prevent oscillation in normal applications. 2 Variable output shunt regulator circuit K R CL Vout GND Vin GND A R1 R2 REF Iref This is circuit 1 above with variable output provided. Vout ≅ 2.5 V × Here, (R1 + R2) R2 Since the reference input current Iref = 3.8 µA Typ (V version: Iref = 2 µA Typ) flows through R1, resistance values are chosen to allow the resultant voltage drop to be ignored. |
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