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TPS9126 Datasheet The LT1371 is a current mode switcher. This means that switch duty cycle is directly controlled by switch current rather than by output voltage. Referring to the block diagram, the switch is turned ON at the start of each oscillator cycle. It is turned OFF when switch current reaches a predetermined level. Control of output voltage is obtained by using the output of a voltage sensing error amplifier to set current trip level. This technique has several advantages. First, it has immediate response to input voltage variations, unlike voltage mode switchers which have notoriously poor line transient response. Second, it reduces the 90Yphase shift at mid-frequencies in the energy storage inductor. This greatly simplifies closed-loop frequency compensation under widely vary- ing input voltage or output load conditions. Finally, it allows simple pulse-by-pulse current limiting to provide maximum switch protection under output overload or short conditions. A low dropout internal regulator pro- vides a 2.3V supply for all internal circuitry. This low dropout design allows input voltage to vary from 2.7V to 25V with virtually no change in device performance. A TPS9126 Price
TPS9126 on stock The SiP41101 has an internal under-voltage lockout feature to prevent driving the MOSFET gates when the supply voltage (at VDD) iS less than the under-voltage lockout specification (VUVL). This prevents the output MOSFETs from being turned on without sufficient gate voltage to ensure they are fully on. There is hysteresis included in this feature to prevent lockout from cycling on and off.
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