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LMR23630AFDDA Datasheet(PDF) 24 Page - Texas Instruments |
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LMR23630AFDDA Datasheet(HTML) 24 Page - Texas Instruments |
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24 / 42 page  ENT ENB IN _ FALLING ENH EN _ HYS ENB R R V V V R u IN _ RISING ENT ENB ENH V R 1 R V § · u ¨ ¸ ¨ ¸ © ¹ ENT ENB IN _ RISING ENH ENB R R V V R u 24 LMR23630 SNVSAH2C – DECEMBER 2015 – REVISED JUNE 2017 www.ti.com Product Folder Links: LMR23630 Submit Documentation Feedback Copyright © 2015–2017, Texas Instruments Incorporated 9.2.2.10 Undervoltage Lockout Setpoint The system undervoltage lockout (UVLO) is adjusted using the external voltage divider network of RENT and RENB. The UVLO has two thresholds, one for power up when the input voltage is rising and one for power down or brown outs when the input voltage is falling. The following equation can be used to determine the VIN UVLO level. (20) The EN rising threshold (VENH) for LMR23630 is set to be 1.55 V (typical). Choose the value of RENB to be 287 kΩ to minimize input current from the supply. If the desired VIN UVLO level is at 6 V, then the value of RENT can be calculated using Equation 21: (21) Equation 21 yields a value of 820 kΩ. The resulting falling UVLO threshold, equals 4.4 V, can be calculated by Equation 22, where EN hysteresis (VEN_HYS) is 0.4 V (typical). (22) 9.2.3 Application Curves Unless otherwise specified the following conditions apply: VIN = 12 V, fSW = 400 kHz, L = 8.2 µH, COUT = 150 µF, TA = 25 °C. VOUT = 5 V IOUT = 3 A fSW = 400 kHz Figure 24. CCM Mode VOUT = 5 V IOUT = 150 mA fSW = 400 kHz Figure 25. DCM Mode VOUT = 5 V IOUT = 0 mA fSW = 400 kHz Figure 26. PFM Mode VOUT = 5 V IOUT = 0 mA fSW = 400 kHz Figure 27. FPWM Mode |
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