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参数资料
| 型号： | IRS2540PBF |
| 厂商： | International Rectifier |
| 文件页数： | 7/15页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HP CONST CURR 8-DIP |
| 标准包装： | 50 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 频率： | 500kHz |
| 电源电压： | 9 V ~ 15.6 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
| 工作温度： | -25°C ~ 125°C |
| 配用： | IRPLLED1-ND - BOARD EVALUATION FOR IRS2540PBF |
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 |
|---|---|
| IRS2540PBF | 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, DIP-8 |
| IRS2540SPbF | 功能描述:LED照明驱动器 200V HALF BRDG DRVR LED BUCK REGULATOR RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| 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照明驱动器 200V Half Bridge LED Driver Buck Regulatr RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| IRS25411 | 制造商:IRF 制造商全称:International Rectifier 功能描述:LED BUCK REGULATOR CONTROL IC |
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