Datasheet

2
dc1498afa
DEMO MANUAL DC1498A
Quick start proceDure
DC1498A is easy to set up to evaluate the performance
of the LTM4620EV. Please refer to Figure 1 for proper
measurement setup and follow the procedure below:
1. Place jumpers in the following positions for a typical
application:
JP1 JP2 JP3 JP4 JP5 JP6
MODE RUN1 RUN2 TRACK1
SEL.
TRACK2
SEL.
CLKOUT
PHASE
CCM ON ON Soft-Start Soft-Start 90°
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 in channel 1 should be 1.5V ±1.5% (1.4775V to
1.525V) and the output voltage in channel 2 should be
1.2V ± 1.5% (1.182V to 1.218V).
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 ripple should be measured
at J1 and J2 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 to 3.5V) sets the load
step current amplitude. The output transient current
can be monitored at the BNC connector J3 (15mV/A).
The pulse signal should have very small duty cycle
(<10%) to limit the thermal stress on the transient
load circuit. Switch the jumper resistors R34 or R35
(on the backside of boards) to apply load transient on
channel 1 or channel 2 correspondingly.
performance summary
(T
A
= 25°C)
PARAMETER CONDITIONS VALUE
Input Voltage Range 4.5V to 16V
Output Voltage V
OUT1
V
IN
= 4.5V to 16V, I
OUT1
= 0A to 12A, JP1: CCM 1.5V ±1.5% (1.4775V to 1.5225V)
Output Voltage V
OUT2
V
IN
= 4.5V to 16V, I
OUT2
= 0A to 12A, JP1: CCM 1.2V ±1.5% (1.182V to 1.218V)
Per-Channel Maximum Continuous Output Current Derating is Necessary for Certain V
IN
, V
OUT
and Thermal
Conditions. See data sheet for detail.
13A (Per Channel)
Default Operating Frequency 600kHz
Resistor Programmable Frequency Range 250kHz to 780kHz
External Clock Synchronous Frequency Range 400kHz to 780kHz
Efficiency of Channel 1 V
IN
= 5V, V
OUT1
= 1.5V, I
OUT1
= 13A, f
SW
= 600kHz 87.7% See Figure 2
Efficiency of Channel 2 V
IN
= 5V, V
OUT2
= 1.2V, I
OUT2
= 13A, f
SW
= 600kHz 85.1% See Figure 3
Load Transient of Channel 1 V
IN
= 12V, V
OUT1
= 1.5V, I
SETP
= 0A to 6A See Figure 4
Load Transient of Channel 2 V
IN
= 12V, V
OUT2
= 1.2V, I
SETP
= 0A to 6A See Figure 5
LTM4620 Demo Cards for Up to 100A Point-of-Load Regulation
MAXIMUM OUTPUT CURRENT (A) NUMBER OF OUTPUT VOLTAGES
NUMBER OF LTM4620 µMODULE
REGULATORS ON THE BOARD DEMO CARD NUMBER
13, 13 2 1 DC1498A
50 1 2 DC1780A-A
75 1 3 DC1780A-B
100 1 4 DC1780A-C