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TPS62021 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS62021 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 28 page www.ti.com 1.6% 0.8% VO Comp High Comp Low Comp Low 2 PWM Mode at Medium to Full Load PFM Mode at Light Load DYNAMIC VOLTAGE POSITIONING MODE (AUTOMATIC PWM/PFM OPERATION AND FORCED PWM OPERATION) 100% DUTY CYCLE LOW DROPOUT OPERATION V I min + VO max ) IO max r DS(on) max ) RL (2) TPS62020 TPS62021 TPS62026 SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 DETAILED DESCRIPTION (continued) Figure 14. Power Save Mode Thresholds and Dynamic Voltage Positioning The converter enters the fixed frequency PWM mode as soon as the output voltage falls below the comp low 2 threshold. As described in the power save mode operation sections before and as detailed in Figure 14 the output voltage is typically 0.8% (i.e., 1% on average) above the nominal output voltage at light load currents, as the device is in power save mode. This gives additional headroom for the voltage drop during a load transient from light load to full load. In the other direction during a load transient from full load to light load the voltage overshoot is also minimized by turning on the N-Channel rectifier switch to pull the output voltage actively down. Connecting the MODE pin of the TPS6202x to GND enables the automatic PWM and power save mode operation. The converter operates in fixed frequency PWM mode at moderate to heavy loads and in the PFM mode during light loads, maintaining high efficiency over a wide load current range. Pulling the TPS6202x MODE pin high forces the converter to operate constantly in the PWM mode even at light load currents. The advantage is the converter operates with a fixed switching frequency that allows simple filtering of the switching frequency for noise sensitive applications. In this mode, the efficiency is lower compared to the power save mode during light loads (see Figure 1 to Figure 3). For additional flexibility it is possible to switch from power save mode to forced PWM mode during operation. This allows efficient power management by adjusting the operation of the TPS6202x to the specific system requirements. The difference between the TPS6202x and the TPS62021 is the logic level of the MODE pin. The TPS62021 has an active-low MODE pin. Pulling the TPS62021 MODE pin high enables the automatic PWM and Power Save Mode. The TPS6202x offers a low input to output voltage difference while still maintaining regulation with the use of the 100% duty cycle mode. In this mode, the P-Channel switch is constantly turned on. This is particularly useful in battery powered applications to achieve longest operation time by taking full advantage of the whole battery voltage range. i.e. The minimum input voltage to maintain regulation depends on the load current and output voltage and can be calculated as: with: • I O(max) = maximum output current plus inductor ripple current • r DS(on)max = maximum P-channel switch tDS(on). 11 |
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