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TPS62051DGSRG4 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS62051DGSRG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 30 page ( ) L DS(ON) O O I R (max) R (max) I (max) V (min) V + ´ + = IO (max) = Maximum output current plus inductor ripple current RDS(ON)(max) = Maximum P-Channel switch resistance RL = DC resistance of the inductor VO(max) = Nominal output voltage plus maximum output voltage tolerance TPS62050, TPS62051, TPS62052, TPS62054, TPS62056 www.ti.com SLVS432F – SEPTEMBER 2002 – REVISED JUNE 2015 Device Functional Modes (continued) It is possible to switch from forced PWM mode to the power-save mode during operation by pulling the SYNC pin low. The flexible configuration of the SYNC pin during operation of the device allows efficient power management by adjusting the operation of the TPS6205x devices to the specific system requirements. 9.4.3 Power-Save Mode Operation (SYNC = LOW) 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 and with a minimum quiescent current to maintain high-efficiency. Whenever the average output current goes below the skip threshold, the converter enters the power-save mode. The average current depends on the input voltage. The current is 100 mA at low input voltages and up to 200 mA with maximum input voltage. The average output current must be less than the threshold for at least 32 clock cycles (tcy) to enter the power-save mode. During the power save mode, the output voltage is monitored with a comparator. When the output voltage falls below the comparator low threshold set to 0.8% above VO nominal, the P-channel switch turns on. The P-channel switch turns off as the peak switch current of typically 200 mA is reached. The N-channel rectifier turns on and the inductor current ramps down. As the inductor current approaches zero, the N-channel rectifier is turned off and the switch is turned on starting the next pulse. When the output voltage can not be reached with a single pulse, the device continues to switch with its normal operating frequency, until the comparator detects the output voltage to be 1.6% above the nominal output voltage. The converter wakes up again when the output voltage falls below the comparator low threshold. This control method reduces the quiescent current to typically to 12 µA and the switching frequency to a minimum achieving the highest converter efficiency. Having these skip current thresholds 0.8% and 1.6% above the nominal output voltage gives a lower absolute voltage drop during a load transient as anticipated with a standard converter operating in this mode. 9.4.4 100% Duty Cycle Low Dropout Operation The TPS6205x devices offer the lowest possible input to output voltage difference while still maintaining operation 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. The minimum input voltage to maintain regulation depends on the load current and output voltage and can be calculated using Equation 1. (1) 9.4.5 No Load Operation If the converter operates in the forced PWM mode and there is no load connected to the output, the converter regulates the output voltage by allowing the inductor current to reverse for a short period of time. Copyright © 2002–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS62050 TPS62051 TPS62052 TPS62054 TPS62056 |
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