Texas Instruments LM5088-1 Evaluation Board LM5088MH-1EVAL/NOPB LM5088MH-1EVAL/NOPB 데이터 시트
제품 코드
LM5088MH-1EVAL/NOPB
Typical Performance Waveforms of LM5088-1 and LM5088-2 Evaluation Boards
2.4
Over Current Protection
The LM5088-1 and LM5088-2 evaluation boards are both configured with over-current protection
schemes. The LM5088-1 employs a cycle-by-cycle current limiting, while the LM5088-2 is configured for a
hiccup mode restart. For more information on RES pin, see LM5088/LM5088Q Wide Input Range Non-
Synchronous Buck Controller (
schemes. The LM5088-1 employs a cycle-by-cycle current limiting, while the LM5088-2 is configured for a
hiccup mode restart. For more information on RES pin, see LM5088/LM5088Q Wide Input Range Non-
Synchronous Buck Controller (
).
2.5
Synchronization
A Sync pin has been provided on the evaluation board. This pin can be used to synchronize the LM5088
to an external clock. For more information on Sync pin, see LM5088/LM5088Q Wide Input Range Non-
Synchronous Buck Controller (
to an external clock. For more information on Sync pin, see LM5088/LM5088Q Wide Input Range Non-
Synchronous Buck Controller (
).
2.6
Active Loads
When using electronic load, it is strongly recommended to power up the evaluation board at light load and
then slowly increase the load. This is necessary as most of the electronic loads do not draw any current till
the output reaches an internally set point; this can result in soft-start function to not work as desired and
can trip the current sense comparator. Electronic loads, in general, are best suited for monitoring steady
state waveforms. If it is desired to power up the evaluation board at maximum load, resistor banks can be
used. This will ensure a soft-start and evaluation board will perform as desired. Ensure that there is
sufficient cooling for both the resistor banks and the LM5088 evaluation board, while running at full load.
then slowly increase the load. This is necessary as most of the electronic loads do not draw any current till
the output reaches an internally set point; this can result in soft-start function to not work as desired and
can trip the current sense comparator. Electronic loads, in general, are best suited for monitoring steady
state waveforms. If it is desired to power up the evaluation board at maximum load, resistor banks can be
used. This will ensure a soft-start and evaluation board will perform as desired. Ensure that there is
sufficient cooling for both the resistor banks and the LM5088 evaluation board, while running at full load.
3
Typical Performance Waveforms of LM5088-1 and LM5088-2 Evaluation Boards
Conditions:
Input Voltage = 48VDC
Output Current = 4A to 7A
Bandwidth Limit = 20 MHz
Traces:
Bottom Trace: Output Current
Amps/div = 2A
Top Trace: Output Voltage response
Volts/div = 100 mV
Horizontal Resolution = 500 µs/div
Input Voltage = 48VDC
Output Current = 4A to 7A
Bandwidth Limit = 20 MHz
Traces:
Bottom Trace: Output Current
Amps/div = 2A
Top Trace: Output Voltage response
Volts/div = 100 mV
Horizontal Resolution = 500 µs/div
Figure 3. Transient Response
3
SNVA379E – November 2008 – Revised April 2013
AN-1913 LM5088 Evaluation Board
Copyright © 2008–2013, Texas Instruments Incorporated