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参数资料
| 型号： | IRS2540PBF |
| 厂商： | International Rectifier |
| 文件页数： | 9/15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
form the voltage clamp. The repetition of the spikes
100
90
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70
60
50
40
30
20
Enable Duty Cycle Relationship to Light Output
can be reduced by simply increasing the capacitor
size.
The two resistors form a voltage divider for the
output, which is then fed into the cathode of the
zener diode. The diode will only conduct, flooding
the enable pin, when its nominal voltage is
exceeded. The chip will enter a disabled state once
the divider network produces a voltage at least 2.5 V
greater than the zener rating. The capacitor serves
10
0
0
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20
30
40
50
60
70
80
90
100
only to filter and slow the transients/switching at the
positive output terminal. The clamped output
Percentage of Light Output
Fig.5 Light Output vs Enable Pin Duty Cycle
voltage can be determined by the following analysis.
The choice of capacitor is at the designer’s
discretion.
EN
V out =
( 2 .5 V + DZ )( R 1 + R 2 )
R 2
DZ = Zener Diode Nominal Rated Voltage
HO
LO
Fig.6 IRS254(0,1) Dimming Signals
Open Circuit Protection Mode
By using the suggested
voltage divider,
capacitor, and zener
diode, the output
Vout
R1
voltage can be clamped
at any desired value. In
open-circuit condition
without output clamp,
the positive output
R2
IFB
EN
3
4
Fig.8 Open Circuit Fault Signals, with Clamp
Under-voltage Lock-out Mode
terminal will float at the
high-side input voltage.
Fig.7 Open Circuit
Protection Scheme
Switching will still occur
between the HO and LO
outputs, whether due to the
output voltage clamp or the watchdog timer.
Transients and switching will be observed at the
positive output terminal as seen in Fig. 8. The
difference in signal shape, between the output
voltage and the I FB , is due to the capacitor used to
www.irf.com
The under-voltage lock-out mode (UVLO) is defined
as the state IRS254(0,1) is in when V CC is below the
turn-on threshold of the IC. During startup
conditions, if the IC supply remains below V CCUV+ , the
IRS254(0,1) will enter the UVLO mode. This state is
very similar to when the IC has been disabled via
control signals, except that LO is also held low.
When the supply is increased to V CCUV+ , the IC enters
the normal operation mode. If already in normal
Page 9
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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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