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AAT1150 Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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AAT1150 Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
9 / 17 page AAT1150 1MHz 1A Step-Down DC/DC Converter 1150.2006.09.1.5 9 Functional Block Diagram VP = 2.7V- 5.5V VCC EN SGND PGND LOGIC 1.0V REF Temp. Sensing OSC OP. AMP LX FB DH DL CMP 1M Ω Applications Information Control Loop The AAT1150 is a peak current mode buck con- verter. The inner wide bandwidth loop controls the peak current of the output inductor. The output inductor current is sensed through the P-channel MOSFET (high side) and is also used for short-cir- cuit and overload protection. A fixed slope com- pensation signal is added to the sensed current to maintain stability. The loop appears as a voltage- programmed current source in parallel with the out- put capacitor. The voltage error amplifier output programs the current loop for the necessary inductor current to force a constant output voltage for all load and line conditions. The feedback resistive divider is inter- nal, dividing the output voltage to the error amplifi- er reference voltage of 1.0V. The error amplifier does not have a large DC gain typical of most error amplifiers. This eliminates the need for external compensation components while still providing suf- ficient DC loop gain for load regulation. The crossover frequency and phase margin are set by the output capacitor value only. Soft Start/Enable Soft start increases the inductor current limit point in discrete steps when the input voltage or enable input is applied. It limits the current surge seen at the input and eliminates output voltage overshoot. The enable input, when pulled low, forces the AAT1150 into a low power, non-switching state. The total input current during shutdown is less than 1μA. |
Similar Part No. - AAT1150_06 |
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Similar Description - AAT1150_06 |
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