DEMO CIRCUIT 1530A
QUICK START GUIDE
LTC3829EUHF
HIGH EFFICIENCY, 3-PHASE, SINGLE OUTPUT,
SYNCHRONOUS BUCK CONVERTER
DESCRIPTION
Demonstration circuit 1530A is a high efficiency, 3-
phase, synchronous buck converter with 7V to 14V
input range. It can supply 60A maximum load cur-
rent at 1.5V output. The demo board uses the
LTC®3829EUHF controller. The LTC3829 is a fea-
ture-rich single-output 3-phase synchronous buck
controller with on-chip drivers, remote output volt-
age sensing, inductor DCR temperature compensa-
tion, phase shedding, nonlinear control and adaptive
voltage positioning (AVP). It is suitable for input
from 4.5V to 38V and output up to 5V. The LTC3856
can provide high efficiency, high power density and
versatile power solutions for telecom and datacom
systems, industrial and medical instruments, DC
power distribution systems and computer systems.
The controller is available in 38-pin 5mm × 7mm
QFN and 38-pin TSSOP packages.
The RUN pin (JP1) provides enable feature. To shut
down the converter, one simple way is to force the
RUN pin below 1.2V (JP1: OFF). Use JP4 jumper to
select burst mode, stage shedding mode or forced
continuous mode operation. The nonlinear control
function is set by JP11. Switching frequency is pre-
set at about 400KHz, and it can be easily modified
from 250KHz to 770KHz. On-board dynamic circuit
is also available for transient test.
Design files for this circuit board are available. Call
the LTC factory.
Table 1.
PARAMETER
Performance Summary (T
A
= 25°C)
CONDITION
VALUE
7V to 14V
V
IN
= 7-14V, I
OUT
= 0A to 60A
V
IN
= 7-14V, V
OUT
= 1.5V
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 60A
1.5V ±2%
60A
86.4%
400kHz
Input Voltage Range
Output Voltage, V
OUT
Maximum Output Current, I
OUT
Typical Efficiency
Typical Switching Frequency
1
LTC3829EUHF
QUICK START PROCEDURE
Demonstration circuit 1530A is easy to set up to
evaluate the performance of the LTC3829EUHF. Refer
to Figure 1 for the proper measurement equipment
setup and follow the procedure below:
1.
With power off, connect the input power sup-
ply to Vin (7V-14V) and GND (input return).
2.
Connect the 1.5V output load between Vout
and GND (Initial load: no load).
3.
Connect the DVMs to the input and outputs.
4.
Turn on the input power supply and check for
the proper output voltages. Vout should be
1.5V+/-2%.
5.
Once the proper output voltages are estab-
lished, adjust the loads within the operating
range and observe the output voltage regula-
tion, ripple voltage and other parameters.
Note: When measuring the output or input voltage
ripple, do not use the long ground lead on the oscillo-
scope probe. See Figure 2 for the proper scope probe
technique. Short, stiff leads need to be soldered to the
(+) and (-) terminals of an output capacitor. The
probe’s ground ring needs to touch the (-) lead and
the probe tip needs to touch the (+) lead.
2
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