2
dc2164aafa
DEMO MANUAL DC2164A-A
Quick start proceDure
Demonstration circuit 2164A-A is easy to set up to
evaluate the performance of PloyPhase operation of the
LTM4630EY-1. Due to the high input/output current, user
should select the proper input supply/load/cable which
can sustain the full load operation. It’s recommended to
pull load current from J2 and J4. The load current pulled
from J5 and J6 shouldn’t exceed 18A. Please refer to
Figure 2 for proper measurement setup and follow the
procedure below:
1. Place jumpers in the following positions for a typical
1V
OUT
application:
JP1
JP2
JP4 ~ JP8
CLK
RUN
VOUT SELECT
INT
OFF
ON JP5/1.0V
2. With power off, connect the input power supply, load
and meters as shown in Figure 2. Preset the load to 0A
and V
IN
supply to 12V.
3. Turn on the power supply at the input. Place JP2 to
ON position. The output voltage between V
O
+
and V
O
–
should be 1V ±0.8% (0.992V ~ 1.008V).
4. Once the proper output voltage is established, adjust the
load within the operating range and observe the output
voltage regulation, output voltage ripple, efficiency
and other parameters. Output voltage ripple should
be measured at J7 with BNC cables. 50Ω termination
should be set on the oscilloscope or BNC cables.
5. (Optional) For optional load transient test, apply an
adjustable pulse signal between IOSTEP CLK and GND
test point. Pulse amplitude (3V ~ 3.5V) sets the load
step current amplitude. The output transient current can
be monitored at the BNC connector J8 (5mV/A). The
pulse signal should be very small duty cycle (<10%)
to limit the thermal stress on the transient load circuit.
6. (Optional) LTM4630-1 can be synchronized to an
external clock signal. Place the JP1 jumper on EXT
and apply a clock signal (0V ~ 5V, square wave) on
the EXT_CLK test point.
7. (Optional) The outputs of LTM4630-1 can track another
supply. The output voltage tracks the voltage on TRACK
when a valid signal is applied on the test point.
8. (Optional) DC2164A-A can be configured to a dual
outputs configuration with V
O
at 52A load current and
V
O2
at 18A load current. Stuff 0Ω resistor on R61 and
0.1µF on C14. Remove R22, R23, R24, R26, R27, R28,
R32, R33, R35. Output voltage V
O2
is set by R37 based
on the equation V
O2
= 0.6V(1 + 60.4k/R37).
performance summary
Specifications are at T
A
= 25°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage Range
4.5
15
V
Output Voltage V
OUT
V
IN
= 4.5 ~ 15V, I
OUT
= 0A ~ 70A, JP5: 1V
1 ±0.8%
(0.992 ~ 1.008)
V
Maximum Continuous Output Current
Derating Is Necessary for Certain V
IN
, V
OUT
and Thermal
Conditions, See Data Sheet for Detail
70
A
Default Operating Frequency
400
kHz
Resistor Programmable Frequency Range
400
780
kHz
External Clock Sync. Frequency Range
400
780
kHz
Efficiency
V
IN
= 12V, V
OUT
= 1V, I
OUT
= 70A, f
SW
= 400kHz
83.5
(See Figure 3)
%
Load Transient
V
IN
= 12V, V
OUT
= 1V, I
STEP
= 0A ~ 17.5A
<58.1
(See Figure 4)
mV
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