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ED8101
differentially measured and subtracted from the
voltage reference provided by a ref erence digital-to-
analog converter (DAC) using an error amplifier. A
flash ADC is then used to convert the voltage into
its digital equivalent. This is followed by internal
digital filtering to improve the system’s noise
rejection.
Although the reference DAC generates a voltage
up to 1.44V, keeping the voltage on the feedback
pin (VFBP) at approximately 1.20V is
recommended to guarantee sufficient headroom. If
a larger output voltage is required, an external
feedback divider is required.
Digital Compens ator
The sampled output voltage is processed by a
digital control loop in order to modulate the DPWM
output signals controlling the power stage. This
digital control loop works as a voltage-mode
controller using PID-type compensation. The basic
structure of the controller is shown in Figure 4. The
controller features two parallel compensators,
steady-state operation, and fast transient operat ion.
The ED8101 implements fast, reliable switching
between the different compensation modes in order
to ensure good transient performance and quiet
steady state. This has been utilized to tune the
compensators individually for the respective needs;
i.e. quiet steady-state and fast transient
performance.
Three different techniques are used to improve
transient performance further:
• Phase-lag reducing sampling technology is
used to acquire fast, accurate, and
continuous information about the output
voltage so that the device can react quickly
to any change in output voltage.
• The technique to drive the DPWM
asynchronously during load transients,
allows limiting the maximum deviation of the
output voltage and recharging the output
capacitors faster.
• A nonlinear gain adjustment is used during
large load transients to boost the loop gain
and reduce the settling time.
Power Sequencing and the CONTROL Pin
The ED8101 supports power-sequencing features
such as programmable ramp up/down and delays.
The typical sequence of events is shown in Figure
5. The CONTROL pin is configured for active high
operation.
The ED8101 features a power good (PGOOD)
output, which can be used to indicate the state of
the power rail. If the output voltage level is above
the power good ON threshold, the pin is set to
active, indicating a stable out put voltage on the rail.
Different levels for turn-on and turn-off are used to
enable the use of a hysteresis if desired. Note that
the power good thresholds are stored in the device
as factors relative to the nominal output voltage.
Hence, using the strapping options to change the
output voltage level also changes the PGOOD
thresholds.
Pre-biased Start-up and Soft-Off
Dedicated pre-biased start-up logic ensures proper
start-up of the power converter when the output
capacitors are pre-charged to a non-zero output
voltage. Closed-loop stability is ensured during this
phase.
ED8101 also supports pre-biased off, i.e. the output
voltage is not ramped down to zero and instead
remains at a predefined level (VOFF_nom). This value
can be configured via the ED81xx Power Designer.
After receiving the shutdown command, via
PMBusTM or the CONTROL pin, the ED8101 will
execute the soft-off sequence. The soft-off
sequence will ramp down the output voltage to the
predefined value. Once the value is reached, the
PWM will be turned off in order to put the output
driver into tri-state mode.
Current Sensing
The ED8101 offers cycle-by-cycle average current
sensing with configurable over-curr ent protection. A
dedicated ADC is used to provide fast and accurate
current information over the switching period. The
acquired information is compared with the
configurable current thresholds to report warning
and error levels to the user. DCR current sensing
across the inductor and dedicated shunt resistors
are supported. This part works the best with
ET4040 which provides a voltage based replica of
the dynamic inductor current waveform (ISEN).
Additionally, this ISEN signal is internally
temperature compensated, allowing the ISEN
indication to correctly track output current even as
internal junction temperature changes due to self-
heating and due to changes in ambient
temperature. Figure 6 shows the current sensing
circuit with ET4040.
End-of-line calibration is supported so that the
ED8101 can achieve improved accuracy over the
full out put current range. The full calibration method
is detailed in the appropriate application note.
www.altera.com/enpirion, Page 9