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RT8128AGSP Datasheet(PDF) 3 Page - Richtek Technology Corporation |
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RT8128AGSP Datasheet(HTML) 3 Page - Richtek Technology Corporation |
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3 / 15 page  RT8128A/C 3 DS8128A/C-03 March 2016 www.richtek.com © Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Functional Block Diagram Operation The controller with the Mach ResponseTM technology is suitable for low external component count configuration with appropriate amount of Equivalent Series Resistance (ESR) capacitor(s) at the output. The output ripple valley voltage is monitored at a feedback point voltage. Refer to the function block diagrams of the RT8128A/C, the synchronous high-side MOSFET is turned on at the beginning of each cycle. After the internal one-shot timer expires, the MOSFET is turned off. The pulse width of this one-shot is determined by the converter's input and output voltages to keep the frequency fairly constant over the entire input voltage range. Another one-shot sets a minimum off-time (400ns typ.). The on-time one-shot comparator has two inputs. One input looks at the output voltage, while the other input samples the input voltage and converts it to a current. This input voltage proportional current is used to charge an internal on-time capacitor. The on-time is the time required for the voltage on this capacitor to charge from zero volt to VOUT, thereby making the on-time of the high- side switch directly proportional to the output voltage and inversely proportional to the input voltage. The implementation results in a nearly constant switching frequency without the need of a clock generator. Min TOFF COMP VREF S1 Q Latch S1 Q Latch + - OV - + UV 125% VREF 67.5% VREF Thermal Shutdown DEM RT8128A On-time One-Shot FB UGATE PHASE GND LGATE/OCSET BOOT EN R Q S + - VCC PHASE SS POR REF VREF + - Sample and Hold 50µA gm VCC + - PGOOD |
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