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NCP5007 参数 Datasheet PDF下载

NCP5007图片预览
型号: NCP5007
PDF下载: 下载PDF文件 查看货源
内容描述: 紧凑型背光LED升压驱动器 [Compact Backlight LED Boost Driver]
分类和应用: 驱动器
文件页数/大小: 22 页 / 159 K
品牌: ONSEMI [ ONSEMI ]
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NCP5007  
PIN FUNCTION DESCRIPTION  
Pin  
Symbol  
Type  
Description  
1
FB  
ANALOG  
INPUT  
This pin provides the output current range adjustment by means of a sense resistor connected  
to the analog control or with a PWM control. The dimming function can be achieved by applying  
a PWM voltage technique to this pin (see Figure 29). The current output tolerance depends  
upon the accuracy of this resistor. Using a "5% metal film resistor, or better, yields good output  
current accuracy. Note: A built−in comparator switches OFF the DC−DC converter if the voltage  
sensed across this pin and ground is higher than 700 mV typical.  
2
3
GND  
EN  
POWER  
This pin is the system ground for the NCP5007 and carries both the power and the analog  
signals. High quality ground must be provided to avoid spikes and/or uncontrolled operation.  
Care must be observed to avoid high−density current flow in a limited PCB copper track so a  
robust ground plane connection is recommended.  
DIGITAL  
INPUT  
This is an Active−High logic input which enables the boost converter. The built−in pulldown  
resistor disables the device when the EN pin is left open. Note the logic switching level of this  
input has been optimized to allow it to be driven from standard or 1.8 V CMOS logic levels.  
The LED brightness can be controlled by applying a pulse width modulated signal to the enable  
pin (see Figure 30).  
4
V
out  
POWER  
This pin is the power side of the external inductor and must be connected to the external  
Schottky diode. It provides the output current to the load. Since the boost converter operates in  
a current loop mode, the output voltage can range up to +22 V but shall not exceed this limit.  
However, if the voltage on this pin is higher than the OVP threshold (Over Voltage Protection)  
the device enters a shutdown mode. To restart the chip, one must either apply a low to high logic  
signal to the EN pin, or switch off the V supply.  
bat  
A capacitor must be used on V to avoid false triggering of the OVP (Overvoltage Protect)  
out  
circuit. This capacitor filters the noise created by the fast switching transients. In order to limit  
the inrush current and still have acceptable startup time the capacitor value should range  
between 1.0 mF and 8.2 mF max. To achieve high efficiency this capacitor should be ceramic  
(ESR t 100 mW).  
Care must be observed to avoid EMI through the PCB copper tracks connected to this pin.  
5
V
bat  
POWER  
The external voltage supply is connected to this pin. A high quality reservoir capacitor must be  
connected across pin 5 and Ground to achieve the specified output voltage parameters. A  
4.7 mF/6.3 V, low ESR capacitor must be connected as close as possible across pin 5 and  
ground pin 2. The X5R or X7R ceramic MURATA types are recommended.  
The return side of the external inductor shall be connected to this pin. Typical application will  
use a 22 mH, size 1210, to handle the 10 to 100 mA output current range. When the desired  
output current is above 20 mA, the inductor shall have an ESR v1.5 W to achieve good  
efficiency over the V range. The output current tolerance can be improved by using a larger  
bat  
inductor value.  
http://onsemi.com  
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