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参数资料
| 型号： | NCP5030MTTXGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/14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
Operation
The NCP5030 DC ? DC converter is based on a Current
Mode PWM architecture specifically designed to
efficiently provide a regulated current to a high current
white LED. This device utilizes fixed frequency
synchronous buck ? boost switching regulator architecture.
This topology is critical in single cell Lithium ? Ion/
Polymer battery or 3 Alkaline powered applications as the
forward voltage of the LED may be greater than or less than
the battery voltage. A low feedback voltage of 200 mV
(nom) minimizes power losses in the current setting
resistor connected between the cathode of the LED and
ground.
The core switching regulator is configured as a full
bridge with four low R DSON (0.1 W ) MOSFET switches to
maximize efficient power delivery. Another advantage of
this topology is that it supports a true ? shut down mode
where the LED will be disconnected from the power supply
when the device is placed in disable mode.
Figure 16 shows how the four switches are connected to
charge and discharge the current from P VIN to V OUT
through the inductor.
V IN I IN I OUT V OUT
The internal oscillator provides a 700 kHz clock signal
to trigger the PWM controller on each rising edge (SET
signal) which starts a cycle. In pure buck or boost mode, the
converter operates in two ? phase mode, the first one to
charge the inductor, followed by a synchronous rectifier
discharge phase. However, in buck ? boost mode, to get high
efficiency the converter controls the switches in three
separate phases (see Buck ? Boost Mode Section). The
capacitor C OUT is used to store energy from the inductor to
smooth output voltage thus constantly powering the load.
Buck Mode (V OUT < V IN – 650 mV)
In Buck mode, switches P1 and N1 are toggling and the
two others are fixed, the switch N2 is all time OFF and the
switch P2 is all time ON. The buck converter operates in
two separate phase (See Figure 18). The first one is T ON
when I IN = I OUT . During this phase the switch P1 is ON, N1
is OFF and the current increases through the inductor. The
switch current is measured by the SENSE CURRENT and
added to the RAMP COMP signal. Then PWM COMP
compares the output of the adder and the signal from
ERROR AMP. When the comparator threshold is
exceeded, T ON phase is followed by T OFF . P1 switch is
turned OFF and N1 is ON until next clock rising edge. The
current is only delivered by the inductor, which means that
I IN = 0
P1
P2
LX1
L
LX2
Start
Cycle
N1
N2
C OUT
LX1
Figure 16. Basic Power Switches Topology
LX2
LX2 = V OUT
The converter operates in three different modes as a
function of V OUT ? V IN (Figure 17): In Buck mode when
V OUT is below V IN – 650 mV (T BUCK nominal), in Boost
mode when V OUT is above V IN + 375 mV (T BOOST
nominal) and in Buck ? Boost mode when V OUT is between
this tow thresholds.
V IN V OUT
I L
1.43 m S
T ON
T OFF
I peak
I valley
I OUT
Buck
2 ? Phase
Buck ? Boost
3 ? Phase
T BUCK
T BOOST
Figure 18. Basic DC ? DC Buck Operation
Boost Mode (V OUT > V IN + 375 mV)
The switches in boost mode are inversely controlled than
Boost
2 ? Phase
Figure 17. Conversion Mode
in buck mode. Switches P2 and N2 are toggling and the two
others are fixed. Switch P1 is all time ON and the switch N1
is all time OFF. The boost converter operates in two
separate phases (See Figure 19). The first one is T ON when
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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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