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| 型号： | NCP5602EVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP5602 |
| 产品变化通告： | Product Obsolescence 30/Jun/2011 |
| 设计资源： | NCP5602 EVB BOM NCP5602EVB Gerber Files NCP5602 EVB Schematic |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 60mA |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 4.8 ~ 5.7 V |
| 特点： | 可调光 |
| 输入电压： | 3.6V |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP5602 |
| 其它名称： | NCP5602EVBOS |
NCP5602
APPLICATION INFORMATION
DC ? DC Operation
The converter is based on a charge pump technique to
generate a DC voltage capable to supply the White LED
load. The system regulates the current flowing into each
LED by means of internal current mirrors associated with
the white diodes. Consequently, the output voltage will be
equal to the Vf of the LED, plus the drop voltage (ranging
from 200 mV to 400 mV, depending upon the output
current) developed across the internal NMOS mirror.
Typically, assuming a standard white LED forward biased
at 10 mA, the output voltage will be 3.8 V.
The built ? in OVP circuit continuously monitor each
output and stops the converter when the voltage is above
Rbias + 300 Iout (eq. 2)
Consequently, the resistor value will range between
R bias = 300/30 mA = 10 k W and R bias = 300/0.5 mA =
600 k W . Obviously, the tolerance of such a resistor must be
1% or better, with a 100 ppm thermal coefficient, to get the
expected overall tolerance.
VBandgap
5.0 V. The converter resumes to normal operation when the
voltage drops below 5.0 V (no latchup mechanism).
Consequently, the chip can operate with no load during any
test procedures.
Load Current Calculation
I REF
+
-
600mV
LED Return
Pin 2 & 3
The load current is derived from the 600 mV reference
voltage provided by the internal Bandgap associated to the
external resistor connected across I REF pin and Ground (see
Figure 3). In any case, no voltage shall be forced at I REF
pin, either downward or upward.
The reference current is multiplied by the constant
R1
GND
Pin 4
GND
Note: The I REF pin must never be
biased by an external voltage.
Figure 3. Basic Reference Current Source
Rbias + (Vref * k) Iout
k = 500 to yield the output load current. Since the reference
voltage is based on a temperature compensated Bandgap,
a tight tolerance resistor will provide a very accurate load
current. The resistor is calculated from the Ohm’s law
(R bias = Vref/I REF ) and a more practical equation can be
arranged to define the resistor value for a given output
current:
(eq. 1)
Rbias + (0.6 * 500) Iout
7
Load Connection
The NCP5602 chip is capable to drive the two LED
simultaneously, as depicted in Figure 1, but the load can be
arranged to accommodate one or two LED if necessary in
the application (see Figure 4). In this case, the two current
mirrors can be connected in parallel to drive a single power
full LED, thus yielding 60 mA current capability in a single
LED.
7
2
3
GND
2
3
GND
Figure 4. Typical Single and Double LED Connections
http://onsemi.com
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP5602MUTBG | 功能描述:LED照明驱动器 WHITE LED DRIVER- 2LED-I2C 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 |
| NCP5603 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:AC-DC Offline Switching Controllers/Regulators |
| NCP5603GEVB | 功能描述:LED 照明开发工具 NCP5603 EVAL BRD RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| NCP5603MNR2 | 功能描述:LED照明驱动器 4.5V/5.0V Hi Eff. 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 |
| NCP5603MNR2G | 功能描述:LED照明驱动器 4.5V/5.0V Hi Eff. White 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 |
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