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| 型号： | IRS25411SPBF |
| 厂商： | International Rectifier |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC LED CONS CURR CTRL 8SOIC |
| 标准包装： | 95 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 通用 |
| 频率： | 500kHz |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
IRS254(0,1)(S)PbF
the normal operation mode. If already in normal
operation, the IC does not enter UVLO unless the
supply voltage falls below V CCUV- - .
Inductance Selection
has a significant effect on the operating frequency or
current regulation, as can be seen in Figs. 13 and 14.
To maintain tight hysteretic current regulation the
inductor and output capacitor C OUT (in parallel with the
LEDs) 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, consider the effect of the inductor when there is no
output capacitor to clearly demonstrate the impact of the
400
390
380
370
360
350
340
330
470uH
680uH
1mH
1.5mH
inductor. In this case, the load current is identical to the
30
80
130
180
inductor current. Fig. 9 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
Vin (V)
Fig.10 Current Regulation for Chosen Inductances
I out = 350 mA, V out = 16.8 V
at reducing the frequency for smaller input voltages.
400
380
425
375
325
275
470uH
680uH
1mH
1.5mH
360
340
320
300
280
260
240
220
470uH
680uH
1mH
1.5mH
225
200
13
18
23
28
33
175
Vout (V)
30
80
Vin (V)
130
180
Fig.11 Frequency Response for Chosen Inductances
I out = 350 mA, V in = 50 V
Fig.9 Frequency Response for Chosen Inductances
I out = 350 mA, V out = 16.8 V
345
Fig. 10 shows how the variation in load current increases
over a span of input voltages, as the inductance is
decreased. Fig. 11 shows the variation of frequency over
different output voltages and different inductance values.
Finally Fig. 12 shows how the load current variation
increases with lower inductance over a range of output
voltages.
343
341
339
337
335
333
331
329
327
325
470uH
680uH
1mH
1.5mH
The output capacitor can be used simultaneously to
13
18
23
28
33
achieve the target frequency and current control
accuracy. Fig. 11 shows how the capacitance reduces
the frequency over a range of input voltage. A small
capacitance of 4.7 μ F has a large effect on reducing the
frequency. Fig. 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
www.irf.com
15
Vout (V)
Fig.12 Current Regulation for Chosen Inductances
I out = 350 mA, V in = 50 V
? 2010 International Rectifier
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