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参数资料
| 型号： | NCP5030MTTXGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP5030MTTXG |
| 设计资源： | NCP5030MTTXG EVB BOM NCP5030MTTXGEVB Gerber Files NCP5030MTTXG EVB Schematic |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 900mA |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 2.2 ~ 5.5 V |
| 特点： | 可调 |
| 输入电压： | 2.7 ~ 5.5 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP5030 |
| 其它名称： | NCP5030MTTXGEVBOS |
NCP5030
Current Selection
Figure 22 shows an application schematic to drive two
selected currents I 1 and I 2 .
Because of the soft ? start function set at 1000 m s (nominal),
higher frequency would cause the device to remain active
with lower than expected brightness. Nevertheless, in this
ILED + I1 ) I2
V OUT
LED
(eq. 2)
case a dimming control using a filtered PWM signal can be
used. In addition, for DC voltage control the same
technique is suitable and the filter is taken away. Please
refer to “NPC5030 Dimming Control Application Note”.
Inductor Selection
V S
NCP5030
200 mV
R2
I 2
FLASH/TORCH
NTHS5404
M1
R1
I 1
R SENSE
Three main electrical parameters need to be considered
when choosing an inductor: the value of the inductor, the
saturation current and the DCR. Firstly, we need to check
if the inductor is able to handle the peak current without
saturating. Therefore, we have to consider that the
maximum peak inductor current is in Buck ? Boost mode
when V OUT is closed T BOOST threshold for the lower
operating V IN . Obviously, the peak current inductor is
higher when this device supplies the maximum required
current. In this case, the DC ? DC converter is supposed to
Figure 22. Two Current Selections
operate in Continuous Conduction Mode (CCM) so the
dotted curve in Figure 23 gives the inductor peak current
as a function of load current:
An active low logic level of M1 enables the low current
mode, So I 2 = 0 and I 1 = I LED = 200 mV / R 1 . For example,
should one need 200 mA for low current mode and 800 mA
2.5
for high current mode, R 1 should be selected according to
the following below:
2
Switch Current Limit
Setup by R PCA
R1 + BV +
F
I1
200 mV
200 mA
+ 1.0 W
(eq. 3)
1.5
So an active high logic level M1 on gate enables the high
current mode then I FLASH = I 1 + I 2 and according Equation
2 and 3, R2 should be selected regarding the following
equation:
1
0.5
Operating Inductor Peak Current
R2 +
* RDSON_M1
R2 +
* 33 m W
FBV
IFLASH * I1
200 mV (eq. 4)
800 mA * 200 mA
R2 + 300 m W
Some recommended resistors include, but are not limited
to:
PANASONIC ERJ3BQF1R0V (1.0 W 1% 0603)
PANASONIC ERJ3BQFR30V (300 m W 1% 0603)
PANASONIC ERJ3BQJ1R0V (1.0 W 5% 0603)
PANASONIC ERJ3BQJR30V (300 m W 5% 0603)
Analogue Dimming
In white LED applications, it is desirable to operate the
LEDs at a specific operating current, as the color shift as the
bias current. As a consequence, it is recommended to dim
the LED current by Pulse Width Modulation techniques. A
low frequency PWM signal can be applied to the CTRL
input. LED brightness can be changed by varying the duty
cycle. To avoid any optical flicker the frequency must be
higher than 100 Hz and preferably less than 300 Hz.
0
100 200 300 400 500 600 700 800 900
I out (mA)
Figure 23. Inductor Peak Currents Vs. I OUT (mA)
Finally, an acceptable DCR must be selected regarding
losses in the coil and must be lower than 100 m W to limit
excessive voltage drop. In addition, as DCR is reduced,
overall efficiency will improve. Some recommended
inductors are included but are not limited to:
TDK VLF5014AT ? 4R71R1
TDK RLF7030T ? 4R7M3R4
COPPER BUSSMANN FP3 ? 4R7
MURATA LQH43CN4R7M03L
NIC: NIP16W4R7MTRF
Switch Current Limit
This safety feature is clamping the maximum allowed
current in the inductor according to external R PCA resistor,
which is connected between PCA input and the ground.
This allows the user to reduce the peak current being drawn
http://onsemi.com
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP5030MTTXGEVB | 制造商:ON Semiconductor 功能描述:NCP5030MTTXG EVAL BOARD ;ROHS COMPLIANT: NO |
| NCP5050 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:4.5 W Flash White LED Boost Driver |
| NCP5050 AW37A WAF | 制造商:ON Semiconductor 功能描述: |
| NCP5050GEVB | 功能描述:LED 照明开发工具 NCV8925 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: |
| NCP5050MTTXG | 功能描述:LED照明驱动器 IND WHITE LED DRIVE 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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