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| 型号： | IRPLLED1 |
| 厂商： | International Rectifier |
| 文件页数： | 7/15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
Functional Description
Operating Mode
is large enough to maintain a low ripple on I FB , I out,avg
can be calculated:
The IRS254(0,1) operates as a time-delayed
hysteritic buck controller. During normal operating
conditions the output current is regulated via the IFB
pin voltage (nominal value of 500 mV). This
feedback is compared to an internal high precision
bandgap voltage reference. An on-board dV/dt filter
has also been used to ignore erroneous
transitioning.
Once the supply to the IC reaches V CCUV+ , the LO
output is held high and the HO output low for a
predetermined period of time. This initiates charging
Iout ( avg ) = VIFBTH
(A)
RCS
(B)
of the bootstrap capacitor, establishing the V BS
floating supply for the high-side output. The IC then
begins toggling HO and LO outputs as needed to
regulate the current.
F ig.2 (A) Storing Energy in Inductor
(B) Releasing Inductor Stored Energy
Iout
HO
HO
LO
50%
50%
t_HO_off
DT1
t_LO_on
50%
50%
t_HO_on
DT2
50%
t_LO_off
IFB
LO
Fig.1 IRS254(0,1) Control Signals, Iavg=1.2 A
As long as V IFB is below V IFBTH , HO is on, modulated
by the watchdog timer described below, the load is
receiving current from V BUS , which simultaneously
stores energy in the inductor, as V IFB increases,
unless the load is open. Once V IFB crosses V IFBTH ,
the control loop switches HO off after the delay
t HO,OFF . Once HO is off, LO will turn on after the
deadtime (DT), the inductor releases the stored
energy into the load and V IFB starts decreasing.
When V IFB crosses V IFBTH again, the control loop
switches HO on after the delay t HO,ON and LO off
after the delay t HO,ON + DT. The switching continues
to regulate the current at an average value
determined as follows. When the inductance value
www.irf.com
IFBTH
Fig.3 IRS254(0,1) Time Delayed Hysterisis
The control method is based upon a free running
frequency, in constrast to a more widely used fixed
frequency regulation. This reduces the part count
since there is no need for frequency setting
components and also provides an inherently stable
sytem, which acts as a current source.
A deadtime of approximately 140 ns between the
two gate drive signals is necessary to prevent a
“shoot-through” condition. At higher frequencies, the
switching losses become very large in the absence
of this deadtime. The deadtime has been adjusted to
maintain precise current regulation, while still
preventing shoot-through.
Page 7
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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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