- 您现在的位置：买卖IC网 > PDF目录20427 > NCP5810DGEVB (ON Semiconductor)EVAL BOARD FOR NCP5810DG PDF资料下载
参数资料
| 型号： | NCP5810DGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP5810DG |
| 产品变化通告： | Product Obsolescence 14/Apr/2010 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，正向和负向 |
| 输出及类型： | 2，非隔离 |
| 功率 - 输出： | 1W |
| 输出电压： | 4.6V，-5V |
| 输入电压： | 3.7V |
| 稳压器拓扑结构： | 反相 |
| 频率 - 开关： | 1.75MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP5810 |
| 其它名称： | NCP5810DGEVBOS |
NCP5810D
TDK: VLF3010AT-4R7MR70 (1.0 mm)
TDK: MLP3216S2R7T (0.6 mm)
SUMIDA: CDH2D09BNP (1.0 mm)
MARUWA CXFU0208-4R7 (0.8 mm)
Schottky Diode Selection
An external diode is required for the rectification of the
negative output. The reverse voltage rating of the selected
diode must be equal to or greater than the difference
between the output voltage of the inverter and the input
voltage. The average current rating of the diode must be
greater than the maximum output load current. The peak
current rating must be larger than the maximum peak
inductor current. It is recommended to use a Schottky diode
with lower forward voltage to minimize the power
dissipation and therefore to maximize the efficiency of the
converter.
Also a particular care must be observed for parasitic
capacitance versus reverse voltage and leakage current
versus junction diode temperature. Both parameters are
impacting the efficiency in low load condition and
switching quiescent current.
Some recommended Schottky diodes include but are not
limited to:
ON SEMICONDUCTOR: NSR0320MW2
ON SEMICONDUCTOR: RB521S30
ROHM: RSX051VA-30
PHILIPS: PMEG2005AEL
Input Capacitor Selection
To achieve high performances (signal integrity) one 4.7
F 6.3 V X5R should be used to bypass the power input
supply C INP (PVIN) and one 1.0 F 6.3 V X5R to bypass
the analog input supply C INA (AVIN).
Output Capacitor Selection
The output capacitor directly affects the output ripple
voltage and the loop stability. C OUTP and C OUTN store
energy during the T OFF phase and sustain the load during
the T ON phase. In order to minimize the output ripple,
typically a 4.7 m F low ESR multi-layer ceramic capacitor
type X5R is recommended. Moreover two 10 m F in parallel
can be used to improved the line transient rejection in
critical conduction mode of the inverter in this case see
recommendation in Buck-Boost Compensation paragraph.
Ceramic Capacitor Caution
A particular care must be observed to select ceramic
capacitors. Actually capacitance can decrease
dramatically with the increased applied DC voltage. This
characteristic is DC bias effect that especially affects
capacitor in small case-size. The capacitance value can
drop below 50% to 70% or even more of the nominal value.
For the boost and buck-boost regulator stability viewpoint
the percentage drop in capacitance for the chosen input and
output operating voltage must be limit to 30% maximum
over operating temperature range. Also too low
capacitance will increase the output voltage ripple and the
noise. Below is a list of recommended capacitors include
but are not limited to, please consult the manufacturers for
more detailed information.
4.7 m F 6.3 V 0603
TDK: C1608X5R0J475MT
TDK: CGB4B1X5R0J475M (0.5 mm)
4.7 m F 10 V 0805
TDK: C2012X5R1A475MT
MURATA: GRM219R61A475KE
10.0 m F 6.3 V 0805
TDK: C2012X5R0J106M (0.95 mm max)
10.0 m F 10 V 0805
TDK: C2012X5R1A106MT (1.25 mm)
Layout Recommendations
The high speed operation of the NCP5810D demands
careful attention to board layout and component
placement. To prevent electromagnetic interference (EMI)
problems and reduce voltage ripple of the device any high
current copper trace which see high frequency switching
should be optimized. Therefore, use short and wide traces
for power current paths and for power ground tracks.
In this application both couples of elements formed by
the Schottky diode D1 / capacitor C4 and D2 (optional) / C3
are in the high frequency switching path where current flow
is discontinuous. These components (D1/C4) in one hand
and (D2/C3) in other hand should be placed as close as
possible to reduce parasitic inductance connection. Also it
is important to minimize the area of the SWP and SWN
nodes and used the ground plane under them to minimize
cross-talk to sensitive signals and IC. The exposed pad of
the package must be connected to ground plane of the board
that is important for EMI and thermal management. Also,
PGND and AGND pin connection must be connected to the
ground plane. In addition, the inductors track connection
L1, L2 and input bypass capacitor C1, C2 must be placed
shortly to the NCP5810D pins connection to reduce EMI.
Finally it is always good practice to keep the sensitive
tracks such as feedback connection (VS and FBN) away
from switching signal connections (SWP and SWN) by
laying the tracks on the other side of PCB. Figure 18 show
an example of optimized PCB layout.
http://onsemi.com
12
相关PDF资料 |
PDF描述 |
|---|---|
| EBM10DTKT-S288 | CONN EDGECARD 20POS .156 EXTEND |
| VF20100S-E3/45 | DIODE SCHOTTKY 20A 100V TO220-3 |
| T95Z226K016ESAL | CAP TANT 22UF 16V 10% 2910 |
| VI-BNL-CW-F3 | CONVERTER MOD DC/DC 28V 100W |
| ESC06DREF-S13 | CONN EDGECARD 12POS .100 EXTEND |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP5810DGEVB | 制造商:ON Semiconductor 功能描述:NCP5810D EVALUATION BOARD ;ROHS COMPLIANT: NO |
| NCP5810DMUTXG | 功能描述:LED照明驱动器 DUAL AMOLED DRVR 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 |
| NCP5810MUTXG | 功能描述:直流/直流开关转换器 DUAL 1 W AMOLED DRVR SUPPLY RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| NCP582DSQ15T1G | 功能描述:低压差稳压器 - LDO 1.5V 150mA w/Enable Low Noise RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCP582DSQ18T1G | 功能描述:低压差稳压器 - LDO 1.8V 150mA w/Enable Low Noise RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
发布紧急采购，3分钟左右您将得到回复。