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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)： | 23/28頁 |
| 文件大?。?/td> | 839K |
| 代理商： | IRS2540 |
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23
RD-0608
www.irf.com
The two resistors R
OV1
and R
OV2
form a voltage divider for the output, which is then fed into the
cathode of the zener diode D
OV
. The diode will only conduct, flooding the enable pin, when its
nominal voltage is exceeded. The chip will enter a disabled state once the divider network produces a
voltage at least 2.5 V greater than the zener rating. The capacitor C
EN
serves only to filter and slow the
transients/switching at the positive output terminal. The clamped output voltage can be determined by
the following analysis.
(
5
V
V
out
=
)(
)
2
2
1
R
R
R
DZ
+
+
Voltage
Rated
Nominal
Diode
Zener
=
DZ
D
OV
has been chosen to be a 7.5 V zener diode. R
OV2
has also been set to 390
to help provide a low
resistive charging path for C
BOOT
as previously discussed. It was also decided to clamp the output
voltage at 30 V, this is sufficiently larger than the predefined maximum load voltage of 24 V as to not
cause any erroneous shut-down, while it is also well within the specifications of the 100 V rated output
stage. Having arbitrarily chosen these parameters, R
OV1
was calculated as follows:
(
5
out
V
=
)(
)
2
2
1
OV
OV
OV
R
R
R
DZ
V
+
+
(
5
)
(
5
)
=
+
V
=
+
=
780
390
5
390
30
2
2
1
V
V
R
DZ
V
R
V
R
OV
OV
out
OV
≈
820
1
OV
R
9.
Other design considerations
Filtering
The RC filter on the IFB pin is only used to remove high frequency transients associated with the FET
switching. The corner frequency of this filter was left high enough to prevent any further distortion of
the feedback.
The input filter is a low-pass filter. Its main objective is to prevent ringing of comparable frequency
on V
bus
. Exact values of capacitance and inductance are not of critical importance, so long as filtering
is accomplished. In addition to the electrolytic that is used for filtering on the bus, there is also a small
ceramic for high frequency signals. Ceramic capacitors typically have low ESR such that they are
more ideal for high frequency filtering.
V
CC
filtering was accomplished by typical means of using a small 100 nF ceramic, an additional
electrolytic was used in case of dimming. The larger electrolytic was placed in event a long enable
signal is given. With this larger capacitance, the V
CC
supply will remain for a prolonged period of time
so the outputs will remain disabled, and the chip will not shut down.
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