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参数资料
| 型号： | NCP5030MTTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/14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
from the supply according to the application’s specific
requirements. The I peak maximum value is 4 A, resulting
in a minimum resistor value of 30 k W . Please refer to
Figure 8 I PEAK_MAX Vs R PCA page 6 to choose R PCA
value versus I PEAK_MAX . By limiting the peak current to
the needs of the application, the inductor sizing can be
scaled appropriately to the specific requirements. This
allows the PCB footprint to be minimized.
Input and Output Capacitors Selection
C OUT stores energy during the T OFF phase and sustains
the load current during the T ON phase. In order ensure the
loop stability and minimize the output ripple, at least 22 m F
low ESR multi ? layer ceramic capacitor type X5R is
recommended.
The V IN and PV IN input pin need to be bypassed by a
X5R or an equivalent low ESR ceramic capacitor. Near the
PV IN pin at least 10 m F 6.3 V or higher ceramic capacitor
is needed. Regarding V IN pin a 1 m F 6.3 V close to the pad
is sufficient. Some recommended capacitors include but
are not limited to:
22 m F 6.3 V 0805
TDK: C2012X5R0J226MTJ
22 m F 6.3 V 1206
MURATA: GRM31CR60J226KE19L
10 m F 6.3 V 0805
TDK C2012X5R0J106MT
Over Voltage Protection (OVP)
The NCP5030 regulates the load current. If there is an
open load condition such as a lost connection to the White
LED, the converter keeps supplying current to the Cout
capacitor causing the output voltage to rise rapidly. To
prevent the device from being damaged and to eliminate
external protection components such as zener diode, the
NCP5030 incorporates an OVP circuit, which monitors the
output voltage with a resistive divider network and a
comparator and voltage reference. If the output reaches 6 V
(nominal), the OVP circuit will detect a fault and inhibit
PWM operation. This comparator has 200 mV hysteresis to
allow the PWM operation to resume automatically when
the load is reconnected and when the voltage drops below
5.8 V.
Under Voltage Lock Out
To ensure proper operation under low input voltage
conditions, the device has a built ? in Under ? Voltage Lock
Out (UVLO) circuit. The device remains disabled until the
input voltage exceeds 2.35 V (nominal). This circuit has
100 mV hysteresis to provide noise immunity to transient
conditions.
Thermal Protection
Normal operation of the NCP5030 is disabled to protect
the device if the junction temperature exceeds 160 ° C.
When the junction temperature drops below 140 ° C, normal
operation will resume.
Layout Recommendations
As with all switching DC/DC converter, care must be
observed to the PCB board layout and component
placement. To prevent electromagnetic interference (EMI)
problems and reduce voltage ripple of the device any
copper trace, which see high frequency switching path,
should be optimized. So the input and output bypass
ceramic capacitor, C IN and C OUT as depicted in Figure 24
must be placed as close as possible the NCP5030 and
connected directly between pins and ground plane. In
additional, the track connection between the inductor and
the switching input, SW pin must be minimized to reduce
EMI radiation.
TBD
Figure 24. Recommended PCB Layout
http://onsemi.com
12
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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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