Linear ANALOG DEVICES DC2631A, Демонстрационное руководство, Страница: 1 / 18

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DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
DESCRIPTION
LTC7852
High Efficiency 6-Phase Step-Down Converter
Demonstration circuit 2631A features the LTC
®
7852 in two
high output current, high efficiency step down converters
each with its own assembly type. The converter for the -A
assembly provides two 3-phase outputs of 1.0V/100A and
1.5V/100A. The -B assembly provides a single 6-phase
1.0V/200A output. Block diagrams are shown in Figure 3.
Both converters operate over a 7V to 14V input voltage
range at a switching frequency of 400kHz.
The power stage for each phase consists of a 5mm
×
5mm DrMOS and 11.3mm
×
11.0mm 0.25µH ferrite
inductor with a DCR of 0.32mΩ typical. The LTC7852
employs a peak current mode architecture which allows
accurate DCR sensing and sharing with sub-mOhm DCR
inductors. The LTC7852 provides a three-state compatible
PWM output for each DrMOS.
Additional features of the DC2631A include:
l
Differential sensing for the output voltages of V
OUT1
and V
OUT2
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PERFORMANCE SUMMARY
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IMON pins to monitor the inductor current of each rail.
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Optional resistors and jumpers to change the phase
arrangement for V
OUT1
and V
OUT2
:
q
V
OUT1
: 4ph, V
OUT2
: 2ph
q
V
OUT1
: 5ph, V
OUT2
: 1ph
q
Note, the default arrangement is:
V
OUT1
: 3ph, V
OUT2
: 3ph
l
Optional resistors and jumpers to parallel V
OUT1
and V
OUT2
.
l
RUN, PGOOD, PLLIN and CLKOUT pins
The LTC7852 data sheet provides a complete descrip-
tion of the IC operation and application information. The
data sheet must be read in conjunction with the quick
start guide.
Design files for this circuit board are available .
Specifications are at T
A
= 25°C, for the -A Assembly
PARAMETER CONDITIONS VALUE
Input Voltage Range 7V to 14V
V
OUT1
V
IN
= 7V to 14V, I
OUT1
= 0A to 100A 1.0V ± 1.5%
I
OUT1
V
IN
= 7V to 14V, V
OUT1
= 1.0V 100A
V
OUT1
Typical Efficiency (See Figure 4) V
IN
= 12V, I
OUT1
= 100A 90.3% Typical
V
OUT2
V
IN
= 7V to 14V, I
OUT2
= 0A to 100A 1.5V ± 2%
I
OUT2
V
IN
= 7V to 14V, V
OUT2
= 1.5V 100A
V
OUT2
Typical Efficiency (See Figure 5) V
IN
= 12V, I
OUT2
= 100A 93.3% Typical
Nominal Switching Frequency 400kHz