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TPS62222DDCT Datasheet(PDF) 11 Page - Texas Instruments |
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TPS62222DDCT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 24 page www.ti.com PFM Mode at Light Load Comparator High Comparator Low Comparator Low 2 PWM Mode at Medium to Full Load 1.6% 0.8% VO DYNAMIC VOLTAGE POSITIONING DIGITAL SELF-CALIBRATION SOFT START TPS62220, TPS62221, TPS62222 TPS62223, TPS62224, TPS62227 TPS62228, TPS62229 SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006 DETAILED DESCRIPTION (continued) Figure 14. Power-Save Mode Thresholds and Dynamic Voltage Positioning The converter enters the fixed frequency PWM mode again as soon as the output voltage falls below the comp low 2 threshold. As described in the power-save mode operation sections and as detailed in Figure 14, the output voltage is typically 0.8% 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. During a load transient from full load to light load, the voltage overshoot is also minimized due to active regulation by turning on the N-channel rectifier switch. In addition to the control circuit as shown in the block diagram, the TPS6222x series uses an internal digital self-calibration of the output voltage to minimize DC load and line regulation. This method of self-calibration allows simple internal loop compensation without the use of external components. The device monitors the output voltage and as soon as the output voltage drops below typically 1.6% or exceeds typically 1.6% of Vout the duty cycle will be adjusted in digital steps. As a result, the output voltage changes in digital steps either up or down where one step is typically 1% of Vout. This results in virtually zero line and load regulation and keeps the output voltage tolerance within ±3% overload and line variations. The TPS6222x has an internal soft-start circuit that limits the inrush current during start-up. This prevents possible voltage drops of the input voltage in case a battery or a high impedance power source is connected to the input of the TPS6222x. The soft start is implemented as a digital circuit increasing the switch current in steps of typically 83 mA, 167 mA, 335 mA and then the typical switch current limit of 670 mA. Therefore, the start-up time mainly depends on the output capacitor and load current. 11 Submit Documentation Feedback |
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