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| 型号： | NCP1530DM27R2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 2.7V 0.6A MICRO8 |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 4,000 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 2.7V |
| 输入电压： | 3.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 600kHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | Micro8? |
NCP1530
For ease of application, the previous equation was
plotted in Figure 35 to help end user to select the right
inductor for specific application. As a rule of thumb, the
user needs to be aware of the maximum peak inductor
current and should be designed not to exceed the saturation
limit of the inductor selected. Low inductance can supply
Output Capacitor Selection
Selection of the output capacitor, C OUT is primarily
governed by the required effective series resistance (ESR)
of the capacitor. Typically, once the ESR requirement is
met, the capacitance will be adequate for filtering. The
output voltage ripple, V RIPPLE is approximated by,
higher output current, but suffers higher output ripple and
reduced efficiency, but it limits the output current
VRIPPLE [ IL_RIPPLE(P * P)
ESR )
4
1
FOSCCOUT
capability. On the other hand, high inductance can improve
output ripple and efficiency, at the same time, it also limits
the output current capability. One other critical parameter
of the inductor is its DC resistance. This resistance can
introduce unwanted power loss and hence reduce overall
efficiency. The basic rule is selecting an inductor with
lowest DC resistance within the board space limitation.
Where F OSC is the switching frequency and ESR is the
effective series resistance of the output capacitor.
From equation in above, it can be noted that the output
voltage ripple is contributed to by two parts. For most of the
cases, the major contributor is the capacitor ’s ESR.
Ordinary aluminum?electrolytic capacitors have high ESR
and should be avoided. High quality Low ESR
12
10
8.0
6.0
4.0
R DS(ON) = 3.0 W
D1, MBRM120ET3
C IN = C OUT = 22 m F
I OUT = 600 mA
I L_RIPPLE(P?P) = 0.2 A
aluminum?electrolytic capacitors are acceptable and
relatively inexpensive. Low ESR tantalum capacitors are
another alternative. For even better performance, surface
mounted ceramic capacitors can be used. Ceramic
capacitors have lowest ESR among all choices. The
NCP1530 is internally compensated for stable operation
with low ESR ceramic capacitors. However, ordinary
multi?layer ceramic capacitors have poor temperature and
frequency performance, for switching applications, so only
high quality, grade X5R and X7R ceramic capacitors can
2.0
2.5 V
2.7 V
3.0 V
3.3 V
be used.
PCB Layout Recommendations
0
3.0
3.5
4.0
4.5
5.0
Good PCB layout plays an important role in switching
mode power conversion. Careful PCB layout can help to
V IN , INPUT VOLTAGE (V)
Figure 35. Inductor Selection Chart
Flywheel Diode Selection
The flywheel diode is turned on and carries load current
during the off time. At high input voltages, the diode
conducts most of the time. In the case where V IN
approaches V OUT , the diode conducts only a small fraction
of the cycle. While the output terminals are shorted, the
diode will be subject to its highest stress. Under this
condition, the diode must be able to safely handle the peak
current circulating in the loop. So, it is important to select
a flywheel diode that can meet the diode peak current and
average power dissipation requirements. Under normal
conditions, the average current conducted by the flywheel
diode is given by,
minimize ground bounce, EMI noise and unwanted
feedbacks that can affect the performance of the converter.
Hints suggested below can be used as a guideline in most
situations.
Grounding
Star?ground connection should be used to connect the
output power return ground, the input power return ground
and the device power ground together at one point. All high
current running paths must be thick enough for current
flowing through and producing insignificant voltage drop
along the path.
Components Placement
Power components, i.e. input capacitor, inductor and
output capacitor, must be placed as close together as
possible. All connecting traces must be short, direct and
thick. High current flowing and switching paths must be
ID + IN
V * VOUT
VIN ) VF
IOUT
kept away from the feedback (V OUT , pin 6) terminal to
avoid unwanted injection of noise into the feedback path.
Where I D is the average diode current and V F is the forward
voltage drop of the diode.
A low forward voltage drop and fast switching diode
must also be used to optimize converter efficiency.
Schottky diodes are a good choice for low forward drop and
fast switching times.
Feedback Path
Feedback of the output voltage must be a separate trace
separated from the power path. The output voltage sensing
trace to the feedback (V OUT , pin 6) pin should be connected
to the output voltage directly at the anode of the output
capacitor.
http://onsemi.com
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| NCP1530DM27R2G | 功能描述:直流/直流开关转换器 600mA PWM/PFM Buck 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 |
| NCP1530DM30R2 | 功能描述:直流/直流开关转换器 600mA PWM/PFM Buck 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 |
| NCP1530DM30R2G | 功能描述:直流/直流开关转换器 600mA PWM/PFM Buck 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 |
| NCP1530DM33R2 | 功能描述:直流/直流开关转换器 600mA PWM/PFM Buck 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 |
| NCP1530DM33R2G | 功能描述:直流/直流开关转换器 600mA PWM/PFM Buck 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 |
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