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参数资料
| 型号： | IRPLLED1A |
| 厂商： | International Rectifier |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC MOSFET DRIVER |
| 标准包装： | 1 |
| 系列： | * |
IRS254(0,1)(S)PbF
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90
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Enable Duty Cycle Relationship to Light Output
to form the voltage clamp. The repetition of the
spikes 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
10
0
0
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80
90
100
than the zener rating. The capacitor serves only to
filter and slow the transients/switching at the positive
EN
Percentage of Light Output
Fig.5 Light Output vs Enable Pin Duty Cycle
output terminal. The clamped output voltage can be
determined by the following analysis. The choice of
capacitor is at the designer’s discretion.
This scheme will not be adequate in all applications.
An improved method is described in IRPLLED1 Rev
D reference design documentation.
V out =
( 2 .5 V + DZ )( R 1 + R 2 )
R 2
HO
LO
Fig.6 IRS254(01,11) Dimming Signals
Open Circuit Protection Mode
DZ = Zener Diode Nominal Rated Voltage
There are several
methods of providing
over voltage protection
at the output if needed.
Vout
R1
The following very
simple method uses a
voltage divider,
capacitor, and zener
diode, the output
R2
IFB
EN
3
4
Fig.8 Open Circuit Fault Signals, with Clamp
voltage can be clamped
at any desired value. In open-
Fig.7 Open Circuit
Protection Scheme
Under-voltage Lock-out Mode
circuit condition without any
output clamp, the positive output terminal may reach a
high DC voltage. 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
www.irf.com
14
The under-voltage lock-out mode (UVLO) is defined
as the state IRS254(01,11) 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(01,11) 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
? 2010 International Rectifier
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| IRPLLNR2U | 功能描述:BALLAST 32W/T8 120V AC IR21571 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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