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ADP1046AW Datasheet(PDF) 18 Page - Analog Devices

Part No. ADP1046AW
Description  Digital Controller for Isolated
Download  88 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP1046AW Datasheet(HTML) 18 Page - Analog Devices

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ADP1046AW
Data Sheet
Rev. 0 | Page 18 of 88
To transfer the z-domain value to the s-domain, plug the follow-
ing bilinear transformation equation into the H(z) equation:
s
f
s
f
z(s)
SW
SW
+
=
2
2
The digital filter introduces an extra phase delay element into
the control loop. The digital filter circuit sends the duty cycle
information to the PWM circuit at the beginning of each switch-
ing cycle (unlike an analog controller, which makes decisions on
the duty cycle information continuously). Therefore, the extra
phase delay for phase margin, Φ, introduced by the filter block is
Φ = 360 × (fC/fSW)
where:
fC is the crossover frequency.
fSW is the switching frequency.
At one-tenth the switching frequency, the phase delay is 36°.
The GUI incorporates this phase delay into its calculations.
Note that the GUI does not account for other delays such as
gate driver and propagation delays.
Two sets of registers allow for two distinct filter responses.
The main filter, called the normal mode filter, is controlled by
programming Register 0x60 to Register 0x63. The light load
mode filter is controlled by programming Register 0x64 to
Register 0x67. The ADP1046AW uses the light load mode filter
only when the output current measured on CS2± is below the
load current threshold (programmed using Register 0x3B[2:0]).
The Analog Devices software GUI allows the user to program the
light load mode filter in the same manner as the normal mode
filter. It is recommended that the GUI be used for this purpose.
In addition, during the soft start process, a soft start filter can
be used in combination with the normal mode filter and the
light load mode filter. The soft start filter is programmed using
Register 0x71 to Register 0x74. For more information, see the
Soft Start section.
Filter Transitions
To avoid output voltage glitches and provide a seamless tran-
sition from one filter to another, the ADP1046AW supports
programmable filter transitions. This feature allows a gradual
transition from one filter to another. Filter transitions are
programmed using Register 0x7A[2:0].
PWM AND SYNCHRONOUS RECTIFIER OUTPUTS
(OUTA, OUTB, OUTC, OUTD, OUTAUX, SR1, SR2)
The PWM and SR outputs are used for control of the primary
side drivers and the synchronous rectifier drivers. These outputs
can be used for several control topologies such as full-bridge,
phase-shifted ZVS configurations and interleaved, two switch
forward converter configurations. Delays between rising and
falling edges can be individually programmed. Special care
must be taken to avoid shoot-through and cross-conduction.
It is recommended that the Analog Devices software GUI be
used to program these outputs. Figure 21 shows an example
configuration to drive a full-bridge, phase-shifted topology
with synchronous rectification.
ISOLATOR
DRIVER
DRIVER
OUTA
OUTB
OUTC
OUTD
SR1
SR2
VIN
OUTA
OUTD
OUTC
OUTB
SR1
SR2
Figure 21. PWM Pin Assignment for Full-Bridge, Phase-Shifted Topology
with Synchronous Rectification
The PWM and SR outputs are all synchronized with each
other. Therefore, when reprogramming more than one of these
outputs, it is important to first update all the registers and then
latch the information into the ADP1046AW at the same time.
During reprogramming, the outputs are temporarily disabled. A
special instruction is sent to the ADP1046AW to ensure that
new timing information is programmed simultaneously. This is
done by setting Bit 1 in Register 0x7F. It is recommended that
PWM outputs be disabled when not in use.
OUTAUX is an additional PWM output pin. OUTAUX allows
an extra PWM signal to be generated at a different frequency
from the other six PWM outputs. This signal can be used to
drive an extra power converter stage, such as a buck controller
located in front of a full-bridge converter. OUTAUX can also
be used as a clock reference signal.
For more information about the various programmable switching
frequencies and PWM timings, see the PWM and Synchronous
Rectifier Timing Registers section (Register 0x3F to Register 0x5C).


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