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DEMO MANUAL
DC2448A-D
performance summary
PARAMETER
Input Voltage Range
Output Voltages
Maximum Continuous Output Current
Operating Frequency
Efficiency
Load Transient V
OUT(P-P)
V
Overvoltage Threshold
OUT
Overtemperature Threshold
Quick start proceDure
Demonstration circuit DC2448A-D is an easy way to
evaluate the performance of PolyPhase operation of the
LTM4636-1EY. 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
CCM
2. With power off, connect the input power supply, load
and meters as shown in Figure 1. Preset the load to 0A
and V
supply to 12V.
IN
3. Turn on the power supply at the input. The output volt-
age should be 0.9V ± 1.3% (0.888V to 0.912V).
2
Specifications are at T
CONDITIONS
Derating is necessary for certain operating conditions. See data sheet for details.
V
= 12V, V
= 0.9V, I
IN
OUT
V
= 12V, V
= 0.9V, I
IN
OUT
R11 = 100kΩ
R71 = R73 = R74 = R75 = 66.5kΩ, V
RUN
ON
= 25°C
A
= 160A
OUT
= 0A TO 40A
STEP
= 5V
BIAS
4. Vary the input voltage from 9V to 15V and adjust the
load current from 0A to 160A. 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) LTM4636-1 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 LTM4636-1 can track another
supply. The output voltage tracks the voltage on TRACK
when a valid signal is applied on the test point.
8. (Optional) To test the OVP and OTP circuitry of LTM4636-1,
another external 5V power supply is needed at the BIAS
pin.
VALUE
9V to 15V
0.9V ±1.3%
160A
DC
350kHz
86.1% Figure 2
95mV Figure 3
1V
130°C
dc2448adf
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