Texas Instruments LM5576 Evaluation Module LM5576EVAL/NOPB LM5576EVAL/NOPB 데이터 시트
제품 코드
LM5576EVAL/NOPB
0.5
1
1.5
2
2.5
3
0
10
20
30
40
50
60
70
80
90
100
EF
F
IC
IEN
C
Y
(%
)
I
OUT
(A)
V
IN
= 24V
V
IN
= 48V
V
IN
= 75V
V
IN
= 7V
Performance Characteristics
3.3
Powering Up
Using the shutdown pin provided will allow powering up the source supply with the current level set low. It
is suggested that the load be kept low during the first power up. Set the current limit of the source supply
to provide about 1.5 times the anticipated wattage of the load. As you remove the connection from the
shutdown pin to ground, immediately check for 5 volts at the output.
is suggested that the load be kept low during the first power up. Set the current limit of the source supply
to provide about 1.5 times the anticipated wattage of the load. As you remove the connection from the
shutdown pin to ground, immediately check for 5 volts at the output.
A quick efficiency check is the best way to confirm that everything is operating properly. If something is
amiss you can be reasonably sure that it will affect the efficiency adversely. Few parameters can be
incorrect in a switching power supply without creating losses and potentially damaging heat.
amiss you can be reasonably sure that it will affect the efficiency adversely. Few parameters can be
incorrect in a switching power supply without creating losses and potentially damaging heat.
3.4
Over Current Protection
The evaluation board is configured with over-current protection. The output current is limited to
approximately 4.5A. The thermal stress is quite severe while in an overloaded condition, limit the duration
of the overload and provide sufficient cooling (airflow).
approximately 4.5A. The thermal stress is quite severe while in an overloaded condition, limit the duration
of the overload and provide sufficient cooling (airflow).
3.5
Synchronization
A SYNC pin has been provided on the evaluation board. This pin can be used to synchronize the regulator
to an external clock or multiple evaluation boards can be synchronized together by connecting their SYNC
pins together. Refer to the LM25576/LM25576Q SIMPLE SWITCHER® 42V, 3A Step-Down Switching
Regulator (
to an external clock or multiple evaluation boards can be synchronized together by connecting their SYNC
pins together. Refer to the LM25576/LM25576Q SIMPLE SWITCHER® 42V, 3A Step-Down Switching
Regulator (
) data sheet for complete information.
4
Performance Characteristics
Efficiency Plots
shows the conversion efficiency versus output current for several input voltage conditions.
Figure 1. Efficiency Plots
Turn-on Waveform
When applying power to the LM5576 evaluation board a certain soft-start sequence occurs.
shows the output voltage during a typical start-up sequence.
3
SNVA210B – January 2007 – Revised April 2013
AN-1570 LM5576 Evaluation Board
Copyright © 2007–2013, Texas Instruments Incorporated