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MC34713EP Datenblatt(PDF) 11 Page - Freescale Semiconductor, Inc |
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MC34713EP Datenblatt(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 21 page Analog Integrated Circuit Device Data Freescale Semiconductor 11 34713 FUNCTIONAL DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION threshold, this block will alert the system control for further commands. • Output Overvoltage and Undervoltage Monitoring: This block monitors the buck converter output voltage to ensure it is within regulation boundaries. If not, this block alerts the system control for further commands. CONTROL AND SUPERVISORY FUNCTIONS This block is used to interface with an outside host. It contains the following circuits: • Shutdown Control Input: An outside host can put the 34713 device into shutdown mode by sending a logic “0” to the SD pin. • Power Good Output Signal PG: The 34713 can communicate to an external host that a fault has occurred by releasing the drive on the PG pin high, allowing the signal/pin to be pulled high by the external pull-up resistor. TRACKING AND SEQUENCING This block allows the output of the 34713 to track the voltage applied at the VREFIN pin in different tracking configurations. This will be discussed in further details later in this document. For power down during a shutdown mode, the 34713 uses internal discharge MOSFET (Figure 2) to discharge the output. The discharge MOSFET is only active during shutdown mode. Using this block along with controlling the SD pin can offer the user power sequencing capabilities by controlling when to turn the 34713 output on or off. BUCK CONVERTER This block provides the main function of the 34713: DC to DC conversion from an un-regulated input voltage to a regulated output voltage used by the loads for reliable operation. The buck converter is a high performance, fixed frequency (externally adjustable), synchronous buck PWM voltage-mode control. It drives integrated 45 mΩ N-channel power MOSFETs saving board space and enhancing efficiency. The switching regulator output voltage is adjustable with an accuracy of less than ±2 % to meet today’s requirements. Its output has the ability to track the voltage applied at the VREFIN pin. The regulator's voltage control loop is compensated using a type III compensation network, with external components to allow for optimizing the loop compensation, for a wide range of operating conditions. A typical Bootstrap circuit with an internal PMOS switch is used to provide the voltage necessary to properly enhance the high-side MOSFET gate. The 34713 has the ability to supply up to 5.0 A of continuous current, making it suitable for many high current applications. |
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