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参数资料
| 型号： | IRPLLED1 |
| 厂商： | International Rectifier |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR IRS2540PBF |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 1.5A |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 24V |
| 特点： | 可调光 |
| 输入电压： | 50 ~ 170V |
| 已供物品： | 板 |
| 已用 IC / 零件： | IRS2540PBF |
| 相关产品： | IRS2540PBF-ND - IC LED DRVR HP CONST CURR 8-DIP |
IRS254(0,1)(S)PbF
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
add capacitance no longer has a significant effect on
the operating frequency or current regulation, as can
be seen in Figs. 13 and 14.
400
390
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.
380
370
360
350
340
330
470uH
680uH
1mH
1.5mH
Fig. 9 shows how the inductor value impacts the
30
80
130
180
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.
425
375
Vin (V)
Fig.10 Current Regulation for Chosen Inductances
I out = 350 mA, V out = 16.8 V
400
380
360
325
275
225
470uH
680uH
1mH
1.5mH
340
320
300
280
260
240
470uH
680uH
1mH
1.5mH
220
175
200
30
80
130
180
13
18
23
28
33
Vin (V)
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
Vout (V)
Fig.11 Frequency Response for Chosen Inductances
I out = 350 mA, V in = 50 V
345
343
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
341
339
337
335
333
331
329
327
470uH
680uH
1mH
1.5mH
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
325
13
18
23
Vout (V)
28
33
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
www.irf.com
Fig.12 Current Regulation for Chosen Inductances
I out = 350 mA, V in = 50 V
Page 10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRPLLED1A | 功能描述:电源管理IC开发工具 Hi-Vlt DC-DC Buck Cnvr HBLED Cur Cntrl RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRPLLED5 | 制造商:International Rectifier 功能描述: |
| IRPLLED7 | 功能描述:IC MOSFET DRIVER RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 外部开关 系列:* 标准包装:95 系列:- 配置:半桥 输入类型:PWM 延迟时间:25ns 电流 - 峰:1.6A 配置数:1 输出数:2 高端电压 - 最大（自引导启动）:118V 电源电压:9 V ~ 14 V 工作温度:-40°C ~ 125°C 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 产品目录页面:1282 (CN2011-ZH PDF) 其它名称:*LM5104M*LM5104M/NOPBLM5104M |
| IRPLLNR1 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| IRPLLNR2E | 功能描述:KIT BALLAST LINEAR INT 230VAC RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、缆线、软件、数据表和用户手册 其它名称:520-1035 |
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