Analog Devices Linear ADI Power DC2861A Demo Manual page 2

DEMO MANUAL DC2861A
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage
Maximum Continuous Output Current
Operating Frequency
Efficiency
Load Transient
QUICK START PROCEDURE
Demonstration circuit 2861A is an easy way to evaluate
the performance of the LTM4658. 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:
RUN
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 supply to 3.3V.
IN
3. Turn on the power supply at the input. The output
voltage should be 1.0V ± 1.5% (0.985V to 1.015V).
4. Vary the input voltage from 2.25V to 5.5V and adjust
the load current from 0A to 10A. Observe the output
voltage regulation, ripple voltage, efficiency, and other
parameters.
5. (Optional) To set LTM4658 to pulse-skipping mode,
not only the MODE pin jumper needs to be put on
"PS", but also FREQ pin needs to be connected to V
See Table 1.
2
Specifications are at T
CONDITIONS/NOTES
Derating is Necessary for Certain Operating Conditions. See
Data Sheet for Details.
V = 3.3V, V = 1.0V, I = 10A
IN OUT OUT
V = 3.3V, V = 1.0V, I = 0A to 5A
IN OUT STEP
MODE/CLK
CCM
IN
= 25°C
A
Table 1. LTM4658 Single Phase Configuration
FREQ PIN MODE/SYNC
CONNECTION PIN CONNECTION
V Clock Input
IN
V
IN
V
IN
Resistor
Clock Output
to AGND
6. (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 current amplitude. Keep the pulse width short
(<1ms) and pulse duty cycle low (<5%) to limit the
thermal stress on the load transient circuit.
7. (Optional) LTM4658 can be synchronized to an external
clock signal. Place the JP8 jumper on CLK and apply
a clock signal on the CLK test point.
8. (Optional) The output of LTM4658 can track another
voltage. This external voltage can be connected to the
test point TRACK on this board.
.
MIN TYP MAX
2.25 5.5
0.985 1.0 1.015
10
2
84.56 (See Figure 2)
124 (See Figure 5)
MODE OF
OPERATION
Forced
Continuous
Forced
AGND
Continuous
V Pulse-Skip
IN
Forced
Continuous
UNITS
V
V
ADC
MHz
%
mV
SWITCHING
FREQUENCY
External
Clock
2MHz Default
2MHz Default
R
FREQ
Programmed
Rev. 0