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TPS622311DRYR Fiches technique(PDF) 9 Page - Texas Instruments |
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TPS622311DRYR Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 40 page 9 TPS62230, TPS62231, TPS62232, TPS62233, TPS62234, TPS62235, TPS62236 TPS62237, TPS62238, TPS62239, TPS622310, TPS622311, TPS622312 TPS622313, TPS622314, TPS622315, TPS622316, TPS622317, TPS622318, TPS622319 www.ti.com SLVS941G – APRIL 2009 – REVISED AUGUST 2016 Product Folder Links: TPS62230 TPS62231 TPS62232 TPS62233 TPS62234 TPS62235 TPS62236 TPS62237 TPS62238 TPS62239 TPS622310 TPS622311 TPS622312 TPS622313 TPS622314 TPS622315 TPS622316 TPS622317 TPS622318 TPS622319 Submit Documentation Feedback Copyright © 2009–2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The TPS6223x synchronous step-down DC – DC converter family includes a unique hysteretic PWM controller scheme which enables switch frequencies over 3 MHz, excellent transient and AC load regulation as well as operation with cost-competitive external components. The controller topology supports forced PWM mode as well as power-save mode operation. Power-save mode operation reduces the quiescent current consumption down to 22 μA and ensures high conversion efficiency at light loads by skipping switch pulses. In forced PWM mode, the device operates on a quasi-fixed frequency, avoids pulse skipping, and allows filtering of the switch noise by external filter components. The TPS6223x devices offer fixed output voltage options featuring smallest solution size by using only three external components. The internal switch current limit of typical 850 mA supports output currents of up to 500 mA, depending on the operating condition. A significant advantage of TPS6223x compared to other hysteretic PWM controller topologies is its excellent DC and AC load regulation capability in combination with low-output voltage ripple over the entire load range which makes this part well suited for audio and RF applications. Once the output voltage falls below the threshold of the error comparator, a switch pulse is initiated, and the high-side switch is turned on. It remains turned on until a minimum ON-time of tONmin expires and the output voltage trips the threshold of the error comparator or the inductor current reaches the high-side switch current limit. Once the high-side switch turns off, the low-side switch rectifier is turned on and the inductor current ramps down until the high-side switch turns on again or the inductor current reaches zero. In forced PWM mode operation, negative inductor current is allowed to enable continuous conduction mode even at no load condition. |
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