TPS658620ZQZT datasheet(66/104 Pages) TI

номер детали	TPS658620ZQZT

подробное описание детали	Advanced Power Management Unit

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TPS658620

Advanced Power Management Unit

SLVS993 – OCTOBER 2009

www.ti.com

Figure 3-18. Boost Converter Block Diagram

The SM3 boost converter operates in a pulse frequency modulation (PFM) scheme with constant peak

current control. This control scheme maintains high efficiency over the entire load current range and

enables the use of small external components, as the switching frequency can reach up to 1 MHz

depending on the load conditions. The LED current ripple is defined by the external inductor size.

The converter monitors the sense voltage at pin FB3, and turns on the integrated power stage switch

when V(FB3) is below the 250mV (typ) internal reference voltage. The integrated power switch turns off

when the inductor current reaches the internal peak current limit or if the switch is on for a period longer

than the maximum on-time of 6

µs (typ).

DETAILED DESCRIPTION

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