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參數(shù)資料
| 型號： | IRS2540SPbF |
| 廠商： | International Rectifier |
| 英文描述： | LED BUCK REGULATOR CONTROL IC |
| 中文描述： | 發(fā)光二極管降壓穩(wěn)壓器控制IC |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 456K |
| 代理商： | IRS2540SPBF |
IRS254(0,1)(S)PbF
www.irf.com Page 10
operation, the IC does not enter UVLO unless the
supply voltage falls below V
CCUV-
-
.
Inductance Selection
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, 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.
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 at reducing the frequency for smaller input
voltages.
175
225
275
325
375
425
30
80
130
180
Vin (V)
F
470uH
680uH
1mH
1.5mH
Fig.9 Frequency Response for Chosen Inductances
I
out
= 350 mA, V
out
= 16.8 V
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.
The output capacitor can be used simultaneously to
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 μF 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 has a significant effect on
the operating frequency or current regulation, as can
be seen in Figs. 13 and 14.
330
340
350
360
370
380
390
400
30
80
130
180
Vin (V)
I
470uH
680uH
1mH
1.5mH
Fig.10 Current Regulation for Chosen Inductances
I
out
= 350 mA, V
out
= 16.8 V
200
220
240
260
280
300
320
340
360
380
400
13
18
23
28
33
Vout (V)
F
470uH
680uH
1mH
1.5mH
Fig.11 Frequency Response for Chosen Inductances
I
out
= 350 mA, V
in
= 50 V
325
327
329
331
333
335
337
339
341
343
345
13
18
23
28
33
Vout (V)
I
470uH
680uH
1mH
1.5mH
Fig.12 Current Regulation for Chosen Inductances
I
out
= 350 mA, V
in
= 50 V
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| IRS2540PBF | LED BUCK REGULATOR CONTROL IC |
| IRS2540STRPbF | LED BUCK REGULATOR CONTROL IC |
| IRS2541PbF | LED BUCK REGULATOR CONTROL IC |
| IRS2541SPbF | LED BUCK REGULATOR CONTROL IC |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IRS2540SPBF | 制造商:International Rectifier 功能描述:LED Driver IC 制造商:International Rectifier 功能描述:IC, LED CURRENT REGULATOR, BUCK, SOIC-8 |
| IRS2540STRPBF | 功能描述:LED照明驅(qū)動器 200V Half Bridge LED Driver Buck Regulatr RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| IRS25411 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:LED BUCK REGULATOR CONTROL IC |
| IRS25411PBF | 功能描述:LED照明驅(qū)動器 Hysteretic Buck LED Drvr RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| IRS25411PBF | 制造商:International Rectifier 功能描述:IC LED DRVR DIP8 |
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