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MC34727AFC Datasheet(PDF) 11 Page - Freescale Semiconductor, Inc |
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MC34727AFC Datasheet(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 19 page Analog Integrated Circuit Device Data Freescale Semiconductor 11 MC34727 FUNCTIONAL DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION Figure 14. MC34727 Functional Internal Block Diagram INTEGRATED SUPPLY INTERNAL REGULATOR AND REFERENCE The internal regulator and reference block steps down the high input voltage to lower voltage, to power all the internal blocks, and provides the reference voltage for the other internal blocks. OSCILLATOR The oscillator block provides 2.0MHz clock signal to the controller. CONTROL THERMAL SHUTDOWN The thermal shutdown block monitors the die temperature. Once the die temperature reaches its threshold, this block turns off the device to prevent the further die temperature rise. SOFT-START The soft-start block controls the output voltage ramp after the device is enabled, to limit the in-rush current. The start-up time is internally set to approximately 2.0ms, and is independent of input voltage, output voltage, or load current. The soft-start sequence also occurs upon recovery from any fault condition. UVLO The UVLO block monitors the input voltage. Once the input voltage is lower than the falling threshold voltage, this block turns off the device, to avoid unpredictable circuit behavior. CURRENT LIMIT The current limit block monitors the inductor current. When the peak inductor current reaches its current limit, this block turns off the high side MOSFET, to prevent the device and external components from damage. POWER MOSFET DRIVER The power-MOSFET driver block controls the phase of the diver signals, and enhances the drive capability of these signals. POWER-MOSFET The power-MOSFET block contains two power MOSFETs. One is a PMOS that passes the current from the input to the output, and the other is an NMOS that provides the inductor current loop when PMOS is turned off. MC34727 - Functional Block Diagram Integrated Supply Oscillator MOSFET Control Integrated Supply Internal Regulator & Reference Control Oscillator Power MOSFET Driver Undervoltage Lockout Power MOSFET Thermal Shutdown Soft Start Current Limit |
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