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4+1 Phase Dual Output Control IC
March 22, 2012 | FINAL | V2.27
Figure 9: Inductor Current Sensing and Current Sense Amplifier
The advantage of sensing the inductor current versus
high-side or low-side sensing is that actual output current
being delivered to the load is obtained rather than peak
or sampled information about the switch currents.
The output voltage can be positioned to meet a load line
based on real-time information. Except for a sense resistor
in series with the inductor, this is the only sense method
that can support a single cycle transient response.
Other methods provide no information during either load
increase (low-side sensing) or load decrease (high-side
sensing).
An additional problem associated with peak or valley
current mode control for voltage positioning is that they
suffer from peak-to-average errors. These errors will
appear in many ways but one example is the effect of
frequency variation. If the frequency of a particular unit is
10% low, the peak-to-peak inductor current will be 10%
larger and the output impedance of the converter will drop
by about 10%. Variations in inductance, current sense
amplifier bandwidth, PWM prop delay, any added slope
compensation, input voltage, and output voltage are all
additional sources of peak-to-average errors.
CURRENT SENSE AMPLIFIER
A high speed differential current sense amplifier is located
in our driver ICs, as shown in Figure 9. Its gain is nominally
32.5 over the entire temperature operating range
therefore the 3850 ppm/ºC inductor DCR temperature
coefficient should be compensated in the voltage loop
feedback path. This can be accurately compensated by
using a linearized Negative TC resistor network where
the NTC can be located near the output inductors. The
resulting temperature compensated current information
is used by the control IC for voltage positioning and current
reporting, and over current limit protection.
The input offset of this amplifier is calibrated to within
+/- 450µV (6 sigma limits) with a 200uV typical LSB
calibration bit. This calibration routine is continuous and
occurs at every 56 PWM cycles.
The current sense amplifier can accept positive differential
input up to 50mV and negative up to -10mV before
clipping. The output of the current sense amplifier is
summed with the VDAC voltage and is returned to the
control IC through the IIN pin. The IIN pins in the control IC
are internally tied together through 3 KOhm resistors to
produce a voltage representative of the average phase
inductor current.
AVERAGE CURRENT SHARE LOOP
A current sharing loop is also incorporated in the IR3531
to ensure balance between the multiphase buck power
stages. Poor current sharing can hamper transient
response and degrade overall system efficiency.
The current information of each phase is compared
against the average phase current through a Share Adjust
Amplifier which then manipulates the respective PWM
ramp start voltage to add or subtract PWM output
duty cycle. The current share amplifier is internally
compensated such that the crossover frequency of the
current share loop is much slower than that of the voltage
loop and the two loops do not interact.
INSTANTANEOUS CURRENT BALANCE
A form of coarse current sharing is also incorporated into
the IR3531 to protect against Synchronized High Load
Repetition Rate transients which can saturate inductors
and cause OVP conditions. The phase firing order of the
multiphase system is continually being re-assessed and
adjusted if required on a cycle-by-cycle basis to prevent
instantaneous phase currents from deviating from each
other. This also improves transient response by ensuring
all phase currents track each other within a few switching
cycles. Individual switch nodes will appear to be variable
frequency however input and output ripple are unaffected
by the varying phase firing order.