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L6727 датащи(PDF) 9 Page - STMicroelectronics

номер детали L6727
подробное описание детали  Single phase PWM controller
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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L6727 датащи(HTML) 9 Page - STMicroelectronics

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L6727
Device description
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4
Device description
L6727 is a single-phase PWM controller with embedded high-current drivers that provides
complete control logic and protections to realize in an easy and simple way a general DC-
DC step-down converter. Designed to drive N-channel MOSFETs in a synchronous buck
topology, with its high level of integration this 8-pin device allows reducing cost and size of
the power supply solution.
L6727 is designed to operate from a 5V or 12V supply bus. Thanks to the high precision
0.8V internal reference, the output voltage can be precisely regulated to as low as 0.8V with
±1% accuracy over line and temperature variations (between 0°C and +70°C).
The switching frequency is internally set to 300kHz.
This device provides a simple control loop with a voltage-mode error-amplifier. The error-
amplifier features a 15MHz gain-bandwidth product and 8V/µs slew rate, allowing high
regulator bandwidth for fast transient response.
To avoid load damages, L6727 provides over current protection as well as over voltage,
under voltage and feedback disconnection protection. When the device is supplied from 5V,
over current trip threshold is programmable by a simple resistor. Output current is monitored
across Low-Side MOSFET RdsON, saving the use of expensive and space-consuming sense
resistor. Output voltage and feedback disconnection are monitored through FB pin.
L6727 implements soft-start increasing the internal reference from 0V to 0.8V in 5.1ms (typ)
in closed loop regulation. Low-Side-Less feature allows the device to perform soft-start over
pre-biased output avoiding high current return through the output inductor and dangerous
negative spike at the load side.


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Аналогичное описание - L6727

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