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TPS62042DRCRG4 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS62042DRCRG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 30 page TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 www.ti.com 11 1.6% 0.8% VO Comp High Comp Low Comp Low 2 PWM Mode at Medium to Full Load PFM Mode at Light Load 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. DYNAMIC VOLTAGE POSITIONING 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. MODE (AUTOMATIC PWM/PFM OPERATION AND FORCED PWM OPERATION) Connecting the MODE pin 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 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 TPS6204x to the specific system requirements. 100% DUTY CYCLE LOW DROPOUT OPERATION The TPS6204x 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: VI min + VO max ) IO max rDS(on)max ) RL with: IO(max)= maximum output current plus inductor ripple current rDS(on)max= maximum P-channel switch tDS(on). RL = DC resistance of the inductor VOmax = nominal output voltage plus maximum output voltage tolerance (2) |
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