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MIC2130-1YTSE Datasheet(PDF) 8 Page - Micrel Semiconductor |
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MIC2130-1YTSE Datasheet(HTML) 8 Page - Micrel Semiconductor |
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8 / 20 page  Micrel, Inc. MIC2130/1 April 2008 8 M9999-042108-C Functional Diagram Figure 1. MIC2130/1 Block Diagram Functional Description The MIC2130/31 is a voltage mode synchronous buck controller built for optimum speed and efficiency. It is designed for wide input voltage range and for high output power buck converters. Figure 1 shows the block diagram. The control loop has two stages of regulation. During steady-state to medium output disturbances, the loop operates in fixed frequency, PWM mode while (gm loop), during a large output voltage disturbance (~±6% nominal), the loop becomes hysteretic; meaning that for a short period, the switching MOSFETs are switched on and off continuously until the output voltage returns to it’s nominal level. This maximizes transient response for large load steps, while nominally operating in fixed frequency PWM mode. Voltage mode control is used to allow for maximum flexibility and maintains good transient regulation. The operating input voltage range is 8V to 40V and output can be set from 0.7V up to 0.85*VIN. Start-up surges are prevented using built in soft start circuitry as well as resistor-less (LSD RDSON is used to sense load current) current sensing for overload protection. Other protection features include UVLO, over voltage latch off protection, Power good signal. |
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