Texas Instruments Evaluation Boards for LM25037 - Dual PWM Controller with Alternating Outputs LM25037EVAL/NOPB LM25037EVAL/NOPB Datenbogen
Produktcode
LM25037EVAL/NOPB
Waveforms
Figure 3. Efficiency vs. Output Current and VIN
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Waveforms
When power is applied to the LM25037 evaluation board a certain sequence of events occurs. Soft-start
capacitor values and other components ensure a linear increase in output voltage for a short time until the
feedback loop can stabilize without an overshoot.
capacitor values and other components ensure a linear increase in output voltage for a short time until the
feedback loop can stabilize without an overshoot.
shows the output voltage during a typical start-
up with a 24V input and a load of 10A. There is no overshoot during startup. It is strongly recommended to
use a resistor load instead of an electronic load, while capturing soft-start data as electronic loads tend to
have small idiosyncrasies such as not providing load resistance till the output reaches certain voltage.
This occasionally causes a transient during start-up.
use a resistor load instead of an electronic load, while capturing soft-start data as electronic loads tend to
have small idiosyncrasies such as not providing load resistance till the output reaches certain voltage.
This occasionally causes a transient during start-up.
Conditions:
Input Voltage = 24VDC
Output Current = 10A
Trace:
Output Voltage, Volts/div = 1V
Horizontal Resolution = 0.5 ms/div
Input Voltage = 24VDC
Output Current = 10A
Trace:
Output Voltage, Volts/div = 1V
Horizontal Resolution = 0.5 ms/div
Figure 4. Soft Start
shows typical output ripple seen directly across the output capacitor, for an input voltage of 24V
and a load of 10A. This waveform is typical of most loads and input voltages.
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AN-1861 LM25037 Evaluation Board
SNVA352C – July 2008 – Revised May 2013
Copyright © 2008–2013, Texas Instruments Incorporated