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参数资料
| 型号： | NCP5030MTTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/14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
the inductor is charged by current from the battery to store
up energy. During this phase the switch N2 is on and P2 is
off. 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, the flip ? flop circuit is reset, P2 switch is
turned on, and N2 is off until the rising edge of the next
LX1
V IN
Start
Cycle
clock cycle.
LX2
V OUT
1.43 m S
I peak
LX1
LX2
Start
Cycle
1.43 m S
LX1 = V IN
I peak
I L
I OUT
T ON T OFF
T C
I valley
I L
T ON
T OFF
I valley
Figure 20. Basic DC ? DC BB Operation
In addition, there are four safety circuits like OVP,
UVLO, IPEAK COMP, THERMAL PROTECTION,
which can disable the DC ? DC conversion.
Error Amp and Compensation
I OUT
Figure 19. Basic DC ? DC Boost Operation
Buck ? Boost Mode
(V IN – 650 mV < V OUT < V IN + 375 mV)
Figure 20 shows the basic DC ? DC Buck ? Boost
operation. Now, all four switches are running and the
controller operates in three separate phases to reach higher
efficiency. The first step is T ON when the inductor is
charged by current from the battery. During this phase the
switch P1_N2 are on and P2_N1 are off. Like the other
Regulation loop is closed by the error amplifier, which
compares the feedback voltage with the reference set at
200 mV. Thanks to the transconductance structure, the
compensation network is directly connected to the error
amplifier output. This external passive network is
necessary to sets the dominant pole to gets a good loop
stability. The compensation network shown in Figure 21
provides a phase margin greater than 45 ° whatever the
current drives in a white LED load.
COMP
100 k
modes, the current measured by SENSE CURRENT is
added to the RAMP COMP signal and compared by PWM
COMP with the signal from ERROR AMP. When PWM
22 pF
330 pF
RSENSE +
+ 250 m W
+
ILED
800 mA
COMP threshold is exceeded, the flip ? flop circuit is reset
and the controller switches in T OFF phase. In this second
phase, the switch P1_N2 are off and P2_N1 are ON.
Because time of T OFF phase is constant, the current stored
in the inductor during 250 ns (nominal) is drained to V OUT .
After this, CONSTANT T OFF delay is over, the circuit logic
switches in the third phase named TC (Time Conduction)
where the inductor is directly connected from PVIN to
V OUT . The switch P1_P2 are on and switches N_N2 are off
until the rising edge of the next clock cycle.
Figure 21. Compensation Network
LED Current Selection
The feedback resistor (R SENSE ) determines the LED
current in steady state. The control loop regulates the
current in such a way that the average voltage at the FB
input is 200 mV (nominal). For example, should one need
800 mA output current, R SENSE should be selected
according to the following equation:
FBV 200 mV
(eq. 1)
http://onsemi.com
10
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相关代理商/技术参数 |
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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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