2
dc2448abf
DEMO MANUAL
DC2448A-B
Quick start proceDure
Demonstration circuit DC2448A-B is an easy way to
evaluate the performance of PolyPhase operation of the
LTM4636EY. Due to the high input/output current, the
user should select the proper input supply/load/cable
which can sustain the full load operation. Please refer to
Figure 1 for proper measurement equipment setup and
follow the procedure below:
1. Place jumpers in the following positions for a typical
application:
MODE
RUN
CCM
ON
2. With power off, connect the input power supply, load
and meters as shown in Figure 1. Preset the load to 0A
and V
IN
supply to 12V.
3. Turn on the power supply at the input. The output volt-
age should be 0.9V ± 1.3% (0.888V to 0.912V).
4. Vary the input voltage from 6V to 15V and adjust the
load current from 0A to 120A. Observe the output
voltage regulation, ripple voltage, efficiency and other
parameters.
5. (Optional) For optional load transient test, apply an
adjustable pulse signal between IOSTEP_CLK and GND
test points. The pulse amplitude sets the load step cur-
rent amplitude. Keep the pulse width short (<1ms) and
pulse duty cycle low (<5%) to limit the thermal stress
on the load transient circuit.
6. (Optional) LTM4636 can be synchronized to an external
clock signal. Apply a clock signal (0V to 5V, square
wave) on the MODE_PLLIN test point.
7. (Optional) The outputs of LTM4636 can track another
supply. The output voltage tracks the voltage on TRACK
when a valid signal is applied on the test point.
performance summary
Specifications are at T
A
= 25°C
PARAMETER
CONDITIONS
VALUE
Input Voltage Range
4.7V to 15V
Output Voltages
0.9V ±1.3%
Maximum Continuous Output Current
Derating is necessary for certain operating conditions. See data sheet for details.
120A
DC
Operating Frequency
350kHz
Efficiency
V
IN
= 12V, V
OUT
= 0.9V, I
OUT
= 120A
85.9% Figure 2
Load Transient V
OUT(P-P)
V
IN
= 12V, V
OUT
= 0.9V, I
STEP
= 0A TO 30A
91mV Figure 3
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