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參數(shù)資料
| 型號： | IRS2540 |
| 廠商： | International Rectifier |
| 英文描述： | IRPLLED1 High Voltage LED Driver using the IRS2540 |
| 中文描述： | IRPLLED1高電壓LED驅(qū)動器采用IRS2540 |
| 文件頁數(shù)： | 22/28頁 |
| 文件大小： | 839K |
| 代理商： | IRS2540 |
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RD-0608
www.irf.com
open-circuit clamp minimizes the amount of stress seen by the load under such circumstances by
clamping the voltage much lower than V
BUS
.
I
Fig. 29: Open-Circuit Protection Scheme
In open-circuit condition, switching will still occur between the HO and LO outputs, whether due to
the output voltage clamp or to the watchdog timer. In this state, rather than regulating the current with
the feedback pin, the output voltage will be loosely regulated via the enable pin. Transients and
switching will be observed at the positive output terminal as seen in Fig. 30. The difference in signal
shape, between the output voltage and the I
FB
, is due to the capacitor C
EN
used to form the voltage
clamp. The repetition of the spikes can be reduced by simply increasing the cap size. If V
BUS
is
significantly larger than the desired output voltage clamp, the output voltage will become a function of
V
BUS
. This is because of the intrinsic delays of the chip (t
LO,on
, t
LO,off
, t
HO,on
, and t
HO,off
) along with the
minimum HO on time. If the load is removed, the output will clamp at the desired voltage. Then if the
bus voltage is increased, there could be a proportional change in the clamped voltage. This is not seen
as an issue since the open-circuit clamp is strictly a safety feature to reduce the stress seen by the load,
if disconnected and reconnected without a power down.
Fig. 30: Open-Circuit Fault Signals, with Clamp
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