2
dc2007a_af
QUICK START PROCEDURE
PERFORMANCE SUMMARY
Specifications are at T
A
= 25°C
PARAMETER
CONDITIONS / NOTES
VALUE
Input Voltage Range
4.5V ~ 15V
Output Voltage V
OUT
V
IN
= 4.5A ~ 15V, I
OUT
= 0A ~ 70A, JP5: 1.0V
1.0V ±1.5% (0.985V ~ 1.015V)
Maximum Continuous Output Current
Derating Is Necessary for Certain V
IN
, V
OUT
and
Thermal Conditions, See Data Sheet for Details.
70A
Default Operating Frequency
400kHz
Resistor Programmable Frequency Range
400kHz to 780kHz
External Clock Sync. Frequency Range
400kHz to 780kHz
Efficiency
V
IN
= 12V, V
OUT
= 1.0V, I
OUT
= 70A, f
SW
= 400kHz
83.5% See Figure 3
Load Transient
V
IN
= 12V, V
OUT
= 1.0V, I
STEP
= 0A ~ 17.5A
<80mV, See Figure 4
Output Voltage Ripple
V
IN
= 12V, V
OUT
= 1.0V, I
OUT
= 70A
<5mV, See Figure 5
Demonstration circuit DC2007A-A is easy to set up to
evaluate the performance of PolyPhase operation of the
LTM4630EV. Due to the high input/output current, the user
should select the proper input supply/load/cable which
can sustain the full load operation. It’s recommended to
pull the 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
1.0V
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 the
ON position. The output voltage between “VO+” and
“VO-” should be 1.0V ±1.5% (0.985V ~ 1.015V).
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 an optional load transient test, apply an
adjustable pulse signal between “IOSTEP CLK” and the
“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 a very small duty cycle (<10%)
to limit the thermal stress on the transient load circuit.
6. (Optional) The LTM4630 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 can track another
supply. The output voltage tracks the voltage on TRACK
when a valid signal is applied on the test point.
8. (Optional) The DC2007A-A can be configured to a dual
output configuration with VO at 52.5A load current and
VO2 at 18A load current. Stuff a 0Ω resistor on R61
and a 0.1µF on C14. Remove R22, R23, R24, R26, R27,
R28, R32, R33, R35. Output voltage, VO2, is set by R37
based on the equation VO2 = 0.6V(1 + 60.4k/R37).
