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LTC3871 Datasheet(PDF) 2 Page - Linear Technology

Part # LTC3871
Description  High Power PolyPhase짰 Bi-Directional Supply/Charger
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3871 Datasheet(HTML) 2 Page - Linear Technology

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dc2348aabf
DEMO MANUAL
DC2348A-A/DC2348A-B
Quick start proceDure
performance summary
DemonstrationcircuitDC2348Ahasvoltageregulation(CV)
and current regulation (CC) modes that can be evaluated.
RefertoFigure1forpropermeasurementequipmentsetup
and follow the procedure below:
NOTE: When measuring the input or output voltage
ripple, care must be taken to avoid a long ground lead
on the oscilloscope probe. Measure the input or output
voltage ripple by touching the probe tip directly across
the VHIGH or VLOW and GND terminals or directly
across relevant capacitor. See Figure 2 for proper scope
probe technique.
For CV (constant voltage) buck mode (VHIGHistheinput
and VLOW is the output):
1. Place jumpers in the following positions:
JP1
ILIM
OPEN
JP2
PHASE1
OPEN
JP3
MODE
FCM
JP4
RUN
OFF
JP6
PHASE2
GND
S1
BUCK/BOOST
BUCK
2. With the power off, connect the input power supply
to VHIGH and GND. Connect the load to VLOW and
GND. The load current should be less than 60A for
DC2348A-A and less than 30A for DC2348A-B.
3. Connect the SETCUR turret according to the BUCK/
BOOST setting:
Buck:
SETCUR = V5 (JP1 pin 2)
Boost:
SETCUR = GND
4. Turn on the power at the input.
NOTE: Make sure that the input voltage is between
30V and 75V.
5. Change the JP4 to ON position.
6. Check for the proper output voltage (VLOW = 11.8V
to 12.2V).
NOTE: If there is no output, temporarily disconnect
the load to make sure that the load is not set too high.
7. Once the proper output voltage is established, adjust
the loads within the operating range and observe the
output voltage regulation, ripple voltage, efficiency
and other parameters.
DC2348-B (2-Phase)
Buck Mode
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VHIGH
Supply Range
30
75
V
VLOW
Output Voltage
11.8
12
12.2
V
Output Current
30
A
fSW
Operating Frequency
110
kHz
Efficiency
48V to 12V at 30A
97
%
Boost Mode
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VLOW
Supply Range
10
13
V
VHIGH
Output Voltage
47
48
49
V
Output Current
7.5
A
fSW
Operating Frequency
110
kHz
Efficiency
12V to 48V at 7.5A
97
%



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