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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)： | 7/28頁 |
| 文件大?。?/td> | 839K |
| 代理商： | IRS2540 |
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7
RD-0608
www.irf.com
4.
Output L
1
and C
OUT
selection
To maintain tight hysteretic current regulation L
1
and C
OUT
need to be large enough to maintain the
supply to the load during t
HO,on
and avoid significant undershooting of the load current, which in turn
causes the average current to fall below the desired value.
First, we are going to look at the effect of the inductor when there is no output capacitor to clearly
demonstrate the impact of the inductor. In this case, the load current is identical to the inductor current.
Figure 7 shows how the inductor value impacts the frequency over a range of input voltages. As can be
seen, the input voltage has a great impact on the frequency and the inductor value has the greatest
impact at reducing the frequency for smaller input voltages.
Figure 8 shows how the variation in load current increases over a span of input voltage, as the
inductance is decreased. Figure 9 shows the variation of frequency over different output voltages and
different inductance values. Finally Fig. 10 shows how the load current variation increases with lower
inductance over a range of output voltages.
175
225
275
325
375
30
80
130
180
V
IN
(V)
F
470uH
680uH
1mH
1.5mH
Fig. 7: I
out
= 350 mA, V
out
= 16.8 V, C
OUT
= 0 μF
The output capacitor can be used simultaneously to achieve the target frequency and current control
accuracy. Figure 11 shows how the capacitance reduces the frequency over a range of input voltage. A
small capacitance of 4.7 μF has a large effect on reducing the frequency. Figure 12 shows how the
current regulation is also improved with the output capacitance. There is a point at which continuing to
add capacitance no longer has a significant effect on the operating frequency or current regulation, as
can be seen in Figs. 12 & 13.
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