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AAT1155IKS-2.5-T1 Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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AAT1155IKS-2.5-T1 Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
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9 / 17 page  AAT1155 1MHz 2.5A Step-Down DC/DC Converter 1155.2005.11.1.6 9 Functional Block Diagram VP = 2.5V to 5.5V EN LOGIC REF Temp. Sensing OSC OP. AMP VCC LX FB DH CMP Applications Information Main Control Loop The AAT1155 is a peak current mode step-down converter. The inner wide bandwidth loop controls the inductor peak current. The inductor current is sensed as it flows through the internal P-channel MOSFET. A fixed slope compensation signal is then added to the sensed current to maintain sta- bility for duty cycles greater than 50%. The inner loop appears as a voltage-programmed current source in parallel with the output capacitor. The voltage error amplifier output programs the cur- rent loop for the necessary inductor current to force a constant output voltage for all load and line con- ditions. The feedback resistive divider is internal, dividing the output voltage to the error amplifier ref- erence voltage of 1.0V. The error amplifier has a limited DC gain. This eliminates the need for exter- nal compensation components, while still providing sufficient DC loop gain for good load regulation. The crossover frequency and phase margin are set by the output capacitor value. Duty cycle extends to 100% as the input voltage approaches the output voltage. Thermal shutdown protection disables the device in the event of a short-circuit or overload condition. Soft Start/Enable Soft start controls the current limit when the input voltage or enable is applied. It limits the current surge seen at the input and eliminates output volt- age overshoot. When pulled low, the enable input forces the device into a low-power, non-switching state. The total input current during shutdown is less than 1µA. Power and Signal Source Separate small signal ground and power supply pins isolate the internal control circuitry from switching noise. In addition, the low pass filter R1 and C3 (shown in Figure 1) filters noise associated with the power switching. |
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