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MC34713 Scheda tecnica(PDF) 11 Page - Freescale Semiconductor, Inc |
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MC34713 Scheda tecnica(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 23 page Analog Integrated Circuit Device Data Freescale Semiconductor 11 34713 FUNCTIONAL DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION enhance the gate of the high side Power MOSFET during switching. SHUTDOWN INPUT (SD) If this pin is tied to the GND pin, the device will be in Shutdown mode. If left unconnected or tied to the VIN pin, the device will be in Normal mode. The pin has an internal pull- up of 1.5 M Ω. POWER GOOD OUTPUT SIGNAL (PG) This is an active low open drain output that is used to report the status of the device to a host. This output activates after a successful power up sequence and stays active as long as the device is in normal operation and is not experiencing any faults. This output activates after a 10 ms delay and must be pulled up by an external resistor to a supply voltage (e.g., VIN). FUNCTIONAL INTERNAL BLOCK DESCRIPTION Figure 4. 34713 Block Diagram INTERNAL BIAS CIRCUITS This block contains all circuits that provide the necessary supply voltages and bias currents for the internal circuitry. It consists of: • Internal voltage supply regulator: This regulator supplies the VDDI voltage that is used to drive the digital/ analog internal circuits. It is equipped with a Power-On- Reset (POR) circuit that watches for the right regulation levels. External filtering is needed on the VDDI pin. This block will turn off during the shutdown mode. • Internal bandgap reference voltage: This supplies the reference voltage to some of the internal circuitry. • Bias circuit: This block generates the bias currents necessary to run all of the blocks in the IC. SYSTEM CONTROL AND LOGIC This block is the brain of the IC where the device processes data and reacts to it. Based on the status of the SD pin, the system control reacts accordingly and orders the device into the right status. It also takes inputs from all of the monitoring/protection circuits and initiates power up or power down commands. It communicates with the buck converter to manage the switching operation and protects it against any faults. OSCILLATOR This block generates the clock cycles necessary to run the IC digital blocks. It also generates the buck converter switching frequency. The switching frequency has a default value of 1.0 MHz and can be programmed by connecting a resistor divider to the FREQ pin, between VDDI and GND pins (See Figure 1). PROTECTION FUNCTIONS This block contains the following circuits: • Over-current limit and short-circuit detection: This block monitors the output of the buck converter for over current conditions and short-circuit events and alerts the system control for further command. • Thermal limit detection: This block monitors the temperature of the device for overheating events. If the temperature rises above the thermal shutdown MC34713 - Functional Block Diagram Internal Bias Circuits System Control and Logic Oscillator Protection Functions Control and Supervisory Functions Tracking and Sequencing Buck Converter |
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