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TPS62184YZFT Datasheet(PDF) 10 Page - Texas Instruments |
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TPS62184YZFT Datasheet(HTML) 10 Page - Texas Instruments |
10 / 32 page ú û ù ê ë é + + = 2 1 ) ( (min) (min) // 2 L L ON DS OUT OUT IN DCR DCR R I V V L PSM load I I D = ) ( TPS62184 SLVSCQ5A – DECEMBER 2014 – REVISED FEBRUARY 2015 www.ti.com Device Functional Modes (continued) Figure 7. Typical Fixed Peak Current (IPEAK) in Power Save Mode space If the load decreases to very light loads and only one phase is needed, either phase (master or follower) might be active. The load current level at which Power Save Mode is entered is calculated as follows: spacing (5) spacing Equation 7 is used to calculate ΔIL. 8.4.3 Minimum Duty Cycle and 100% Mode Operation When the input voltage comes close to the output voltage, the device enters 100% mode and both high-side FETs are continuously switched on as long as VOUT remains below its setpoint. The minimum VIN to maintain output voltage regulation is calculated as: spacing (6) spacing This allows the conversion of small input to output voltage differences, for example for longest operation time in battery powered applications. In 100% duty cycle mode, the low-side FET is switched off. While the maximum ON-time is not limited, the AEE feature, explained in the next section, secures a minimum ON-time of about 100 ns. 8.4.4 Automatic Efficiency Enhancement (AEE™) AEE™ provides highest efficiency over the entire input voltage and output voltage range by automatically adjusting the converter's switching frequency. This is achieved by setting the predictive off-time of the converter. The efficiency of a switched mode converter is determined by the power losses during the conversion. The efficiency decreases, if VOUT decreases and/or VIN increases. In order to keep the efficiency high over the entire duty cycle range (VOUT/VIN ratio), the switching frequency is adjusted while maintaining the ripple current. The following equation shows the relation between the inductor ripple current, switching frequency and duty cycle. spacing 10 Submit Documentation Feedback Copyright © 2014–2015, Texas Instruments Incorporated Product Folder Links: TPS62184 |
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