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TPS62180YZFR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS62180YZFR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 35 page ÷ ÷ ÷ ÷ ø ö ç ç ç ç è æ × - × = ÷÷ ø ö çç è æ × - × = D SW IN OUT OUT SW OUT L f L V V V f L D V I 1 1 TPS62180, TPS62182 www.ti.com SLVSBB8A – AUGUST 2014 – REVISED AUGUST 2014 Device Functional Modes (continued) spacing This allows the conversion of small input to output voltage differences, for example for lthe ongest 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. 9.4.4 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 (7) spacing Efficiency increases by decreasing switching losses, preserving high efficiency for varying duty cycles, while the ripple current amplitude remains low enough to deliver the full output current without reaching current limit. The AEE feature provides an efficiency enhancement for various duty cycles, especially for lower Vout values, where fixed frequency converters suffer from a significant efficiency drop. Furthermore, this feature compensates for the very small duty cycles of high VIN to low VOUT conversion, which limits the control range in other topologies. Figure 9 shows the typical switching frequency over the input voltage range. space Figure 9. Typical Switching Frequency vs Input Voltage space Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS62180 TPS62182 |
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