link to page 9 link to page 9 link to page 9 TLV431, NCV431, SCV431 350 Input 1.8 kW Output Input Output IK Iref Hz) 325 1.5 VKA = Vref Pulse √ 50 IK = 10 mA Generator f = 100 kHz Output T 1.0 A = 25°C TS) TA = 25°C 300 0.5 TAGE (nV/ Input (VOL 0 275 NOISE VOL 2.0 0 250 10 100 1.0 k 10 k 100 k 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 f, FREQUENCY (Hz) t, TIME (ms) Figure 16. Spectral Noise DensityFigure 17. Pulse Response 25 1.0 k TA = 25°C IK R1 20 A Stable (mA) V+ CL 15 C R2 B Stable 10 THODE CURRENT , CA I K 5.0 Stable UnstableVKAR1R2Regions(V)(kW)(kW) D 010 100 1.0 0.01 0.1 1.0 10 100 A, C Vref 0 ∞ pF pF nF mF mF mF mF mF B, D 5.0 30.4 10 CL, LOAD CAPACITANCE Figure 18. Stability Boundary ConditionsFigure 19. Test Circuit for Figure 18Stability Figures 18 and 19 show the stability boundaries and equivalent series resistance (ESR). Ceramic or tantalum circuit configurations for the worst case conditions with the surface mount capacitors are recommended for both load capacitance mounted as close as possible to the device. temperature and ESR. The application circuit stability The required load capacitance for stable operation can vary should be verified over the anticipated operating current and depending on the operating temperature and capacitor temperature ranges. www.onsemi.com9