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FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
MC34717 - Functional Block Diagram
Internal Bias Circuits
Protection Functions
System Control and Logic
Control and
Supervisory Functions
2 x Buck Converter
Figure 4. Block Illustration
Oscillator
Tracking and Sequencing
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 V DDI 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 converters
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 converters 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
threshold, this block will alert the system control for
further commands.
? Output over-voltage and under-voltage monitoring: This
block monitors the buck converters output voltages to
ensure they are 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
34717 device into shutdown mode by sending a logic
“0” to the SD pin.
? Power good output signal: The 34717 can communicate
to an outside host tha t a fault has occurred by pulling
the voltage on the PG pin high.
switching frequency. The switching frequency can be
34717
Analog Integrated Circuit Device Data
14
Freescale Semiconductor
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