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参数资料
| 型号： | NCP5030MTTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR HIGH BRIGHT 12WDFN |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 600kHz ~ 800kHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 2.2 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 供应商设备封装： | 12-WDFN（4x3） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | NCP5030MTTXGOSDKR |
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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| NCP5030MTTXGEVB | 功能描述:电源管理IC开发工具 NCP5030MTTXG EVAL BRD 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 |
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