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LMR10515YMF Datasheet(PDF) 10 Page - Texas Instruments |
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LMR10515YMF Datasheet(HTML) 10 Page - Texas Instruments |
10 / 26 page VIN - VOUT L = 2'iL DTS t L i ' OUT I S T S DT L VOUT L - VOUT VIN D = VOUT + VD VIN + VD - VSW D = VOUT VIN FB GND SW EN VOUT L1 D1 R1 R2 VINA/VIND C1 C4 U1 C2 GND EN 2 6 4, 5 1 3 R3 Chf 2.2 PF VIN C3 GND 22 PF 20k 10k 2.2 PF 22 PF 22 nF (opt.) 1.0 PH 3.3 PH (³;´ YHUVLRQ) 1.8V LMR10515 SNVS728C – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com THERMAL SHUTDOWN Thermal shutdown limits total power dissipation by turning off the output switch when the IC junction temperature exceeds 165°C. After thermal shutdown occurs, the output switch doesn’t turn on until the junction temperature drops to approximately 150°C. Figure 22. Typical Application Schematic Design Guide INDUCTOR SELECTION The Duty Cycle (D) can be approximated quickly using the ratio of output voltage (VO) to input voltage (VIN): The catch diode (D1) forward voltage drop and the voltage drop across the internal PMOS must be included to calculate a more accurate duty cycle. Calculate D by using the following formula: VSW can be approximated by: VSW = IOUT x RDSON The diode forward drop (VD) can range from 0.3V to 0.7V depending on the quality of the diode. The lower the VD, the higher the operating efficiency of the converter. The inductor value determines the output ripple current. Lower inductor values decrease the size of the inductor, but increase the output ripple current. An increase in the inductor value will decrease the output ripple current. One must ensure that the minimum current limit (1.8A) is not exceeded, so the peak current in the inductor must be calculated. The peak current (ILPK) in the inductor is calculated by: ILPK = IOUT + ΔiL Figure 23. Inductor Current In general, 10 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Product Folder Links: LMR10515 |
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