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TPS62200DBV Datasheet(PDF) 4 Page - Texas Instruments |
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TPS62200DBV Datasheet(HTML) 4 Page - Texas Instruments |
4 / 19 page www.ti.com POWER SAVE MODE OPERATION I skip v 66 mA ) Vin 160 W I peak + 66 mA ) Vin 80 W PFM Mode at Light Load Comparator High Comparator Low Comparator Low 2 PWM Mode at Medium to Full Load 1.6% 0.8% VO TPS62200 ,, TPS62201 TPS62202, TPS62203, TPS62207 TPS62204, TPS62205, TPS62208 SLVS417E – MARCH 2002 – REVISED MAY 2006 DETAILED DESCRIPTION (continued) The GM amplifier and input voltage determines the rise time of the Sawtooth generator; therefore any change in input voltage or output voltage directly controls the duty cycle of the converter. This gives a very good line and load transient regulation. As the load current decreases, the converter enters the power save mode operation. During power save mode, the converter operates with reduced switching frequency in PFM mode and with a minimum quiescent current to maintain high efficiency. Two conditions allow the converter to enter the power save mode operation. One is when the converter detects the discontinuous conduction mode. The other is when the peak switch current in the P-channel switch goes below the skip current limit. The typical skip current limit can be calculated as During the power save mode the output voltage is monitored with the comparator by the thresholds comp low and comp high. As the output voltage falls below the comp low threshold set to typically 0.8% above Vout nominal, the P-channel switch turns on. The P-channel switch is turned off as the peak switch current is reached. The typical peak switch current can be calculated: The N-channel rectifier is turned on and the inductor current ramps down. As the inductor current approaches zero the N-channel rectifier is turned off and the P-channel switch is turned on again, starting the next pulse. The converter continues these pulses until the comp high threshold (set to typically 1.6% above Vout nominal) is reached. The converter enters a sleep mode, reducing the quiescent current to a minimum. The converter wakes up again as the output voltage falls below the comp low threshold again. This control method reduces the quiescent current typically to 15 µA and reduces the switching frequency to a minimum, thereby achieving the high converter efficiency. Setting the skip current thresholds to typically 0.8% and 1.6% above the nominal output voltage at light load current results in a dynamic output voltage achieving lower absolute voltage drops during heavy load transient changes. This allows the converter to operate with a small output capacitor of just 10 µF and still have a low absolute voltage drop during heavy load transient changes. Refer to Figure 2 for detailed operation of the power save mode. Figure 2. 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. 4 Submit Documentation Feedback |
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