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| 型号： | XRP7603EDB-F |
| 厂商： | Exar Corporation |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HIGH PWR 8HSOICN-EP |
| 标准包装： | 46 |
| 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 |
| 类型 - 次要： | 白色 LED |
| 频率： | 960kHz ~ 1.55MHz |
| 电源电压： | 4.5 V ~ 29 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 其它名称： | 1016-1338-5 |
X R P 7 6 0 3
5 0 0 m A 2 9 V N o n - S y n c . B u c k H i g h P o w e r L E D D r i v e r
THEORY OF OPERATION
The XRP7603 is a fixed frequency, Voltage-
mode, non-synchronous buck PWM regulator
optimized for driving LEDs. Constant LED
current is achieved using resistor RFB as
shown in the page 1 schematic. A low 0.2V
reference voltage minimizes power dissipation
in RFB. A tight reference voltage tolerance of
±3%, over full operating conditions, helps
accurately program the LED current. High
switching frequency of 1.2MHz (nominal)
reduces the size of passive components.
Dimming and power sequencing is achieved
using a logic-level PWM signal applied to FB
pin via a diode. Overcurrent protection (OCP)
is based on high-side MOSFET’s Rds(on) and is
programmable via a resistor placed at LX
node.
P ROGRAMMING THE LED CURRENT
Use the following equation to program the LED
current:
DIM = L. The DIM signal needs to be greater
than 600mV minimum to turn-off the XRP7603
and less than 200mV to fully turn-on the
XRP7603. It is recommended to use a signal
with DIM = 1V or more for OFF and 0V for ON.
The user should note that the logic is reversed
relative to many other PWM controlled LED
drivers. In other words a logic level high at
20% duty cycle will result in approximately an
80% duty cycle for the LED. Recommended
modulation frequencies are from 100Hz to
200Hz with 10 – 90% duty cycle, 500Hz with
10 – 80% duty cycle, and 1000Hz with 10 -
70% duty cycle. Figures 15 & 16 show the
output response at the maximum PWM DIM
signal of 1000Hz. See figure 17 for 100Hz to
1000Hz duty cycle response for two Luxeon K2
LEDs in parallel at 2A total current.
Equ.1: RFB =
0.2 V
I LED
The output voltage will adjust as needed to
ensure average I LED is supplied. For example if
the output current has to be set at 0.35A then
RFB=0.57 Ohm. If the output LED has a
corresponding Vf of 3.5V then XRP7603 will
step down the V IN to 3.5V. If two of these
LEDs are placed in series then XRP7603 will
step down the voltage to 7V. Superimposed on
I LED there is a current ripple that is equal in
magnitude to inductor current ripple. Current
ripple will be nominally set to 10% of I LED by
proper sizing of inductor. Note that throughout
Ch1: DIM Signal
Ch2: VFB - 2A I OUT /div
Fig. 14: 1.1KHz, 10% Duty Cycle Dimming Signal
Dimming Signal is ~70% LED Duty Cycle
this datasheet I LED
interchangeably.
D IMMING SIGNAL
and I O
will be used
Ch1: DIM Signal
Ch2: VFB - 2A I OUT /div
A logic-level PWM signal applied through a
small-signal diode to the feed-back (FB) pin
can be used for dimming control of the LED.
This external signal we call DIM turns the
MOSFET gate drive on/off, thereby modulating
the average current delivered to the LED. The
DIM signal connects to the VFB pin through a
1N4148 diode and will shutdown the XRP7603
when DIM = H and turn-on the XRP7603 when
Fig. 15: 1KHz, 70% Duty Cycle
Dimming Signal is ~10% LED Duty Cycle
? 2009 Exar Corporation
8/13
Rev. 1.0.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRP7603EDB-F/TR | 功能描述:电压模式 PWM 控制器 0.5A 29V Non-Sync Buck High Power RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| XRP7603EDBTR-F | 功能描述:LED照明驱动器 Power LED Driver 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 |
| XRP7603EVB | 功能描述:电源管理IC开发工具 Eval Board for XRP7603 Series 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 |
| XRP7604 | 制造商:EXAR 制造商全称:EXAR 功能描述:1A 29V Non-Sync. Buck High Power LED Driver |
| XRP7604EDB-F | 功能描述:LED照明驱动器 1A 29V Non-Sync Buck High Power 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 |
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