Use the E × T value from the previous formula and match it with the E × T number on the vertical axis of the Inductor Value Selection Guide shown in Figure 30. E × T = 34.2 (V ×μs) 3. On the horizontal axis, select the maximum load current. ILOAD(max) = 3 A 4. ...
This rating is calculated using the formula PDCmax = (TJmax − TA) / θJA, where PDCmax is the absolute maximum power dissipation, TJmax is the maximum junction temperature, and θJA is the junction ot ambient thermal resistance of the package. The PDCmax rating of 1.28W results from ...
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8.2.4.2 Programming Output Voltage (Selecting R1 And R2) Referring to the adjustable regulator in Figure 17, the output voltage is programmed by the resistors R1 and R2 by the following formula: VOUT = VREF (1 + R1/R2) where VREF = 1.23V (1) Resistors R1 and R2 divide the output ...
(5) 2. Use the E × T value from the previous formula and match it with the E × T number on the vertical axis of the Inductor Value Selection Guide shown in Figure 38. E × T = 34.2 (V ×μs) 3. On the horizontal axis, select the maximum load current. ILOAD(max) = 3 A...
(Selecting R1 And R2) Referring to the adjustable regulator in Figure 50, the output voltage is programmed by the resistors R1 and R2 by the following formula: VOUT = VREF (1 + R1/R2) where • VREF = 1.23 V (1) Resistors R1 and R2 divide the output voltage down so that it can ...
(TAmax) of the application, and the maximum allowable junction temperature (TJmax): TRmax = TJmax− TAmax (4) The maximum allowable value for junction to ambient Thermal Resistance, θJA, can be calculated using the formula: θJA = TRmax / PD (5) The LP3876-ADJ is available in TO...
R1 can be selected for a given VOUT using the following formula: VOUT = VADJ (1 + R1/R2) + IADJ (R1) where • VADJ is the adjust pin voltage • IADJ is the bias current flowing into the adjust pin (2) 8.2.2.5 RFI/EMI Susceptibility Radio Frequency Interference (RFI) and ...
The output voltage is given by the formula: VOUT = VADJ x (1 + (R1/R2)) (1) The resistors used for R1 and R2 should be high quality, tight tolerance, and with matching temperature coefficients. It is important to remember that, although the value of VADJ is specified, the final ...