参数资料
| 型号： | ADP3198JCPZ-RL |
| 厂商： | ON Semiconductor |
| 文件页数： | 20/31页 |
| 文件大小： | 0K |
| 描述： | IC BUCK CTRLR 8BIT PROG 40LFCSP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 2,500 |
| 应用： | 控制器，Intel VRM |
| 输入电压： | 12V |
| 输出数： | 4 |
| 输出电压： | 0.5 V ~ 1.6 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 40-LFCSP-VQ（6x6） |
| 包装： | 带卷 (TR) |
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ADP3198
Equation 5 can be used to determine the minimum inductance
based on a given output ripple voltage.
The best choice for a core geometry is a closed-loop type such
as a potentiometer core (PQ, U, or E core) or toroid. A good
L ≥
V VID × R O × ( 1 ? ( n × D ) )
f SW × V RIPPLE
(5)
compromise between price and performance is a core with
a toroidal shape.
Solving Equation 5 for an 8 mV p-p output ripple voltage yields
Many useful magnetics design references are available for
quickly designing a power inductor, such as
L ≥
1.3 V × 1.0 mΩ × ( 1 ? 0.432 )
330 kHz × 8 mV
= 2 80 nH
?
?
Intusoft Magnetic Designer Software
Designing Magnetic Components for High Frequency
If the resulting ripple voltage is less than what is designed for,
the inductor can be made smaller until the ripple value is met.
This allows optimal transient response and minimum output
decoupling.
The smallest possible inductor should be used to minimize
the number of output capacitors. For this example, choosing a
DC to DC Converters , by William T. McLyman,
Kg Magnetics, Inc., ISBN 1883107008
Selecting a Standard Inductor
The following power inductor manufacturers can provide design
consultation and deliver power inductors optimized for high
power applications upon request.
320 nH inductor is a good starting point and gives a calculated
ripple current of 11 A. The inductor should not saturate at the
peak current of 35.5 A and should be able to handle the sum of
the power dissipation caused by the average current of 30 A in
?
?
?
Coilcraft?
Coiltronics?
Sumida Corporation?
the winding and core loss.
CURRENT SENSE AMPLIFIER
Another important factor in the inductor design is the dc
resistance (DCR), which is used for measuring the phase currents.
A large DCR can cause excessive power losses, though too small
a value can lead to increased measurement error. A good rule is
to have the DCR (R L ) be about 1 to 1? times the droop resistance
(R O ). This example uses an inductor with a DCR of 1.4 mΩ.
Designing an Inductor
Once the inductance and DCR are known, the next step is to
either design an inductor or to find a standard inductor that
comes as close as possible to meeting the overall design goals.
It is also important to have the inductance and DCR tolerance
specified to control the accuracy of the system. Reasonable
tolerances most manufacturers can meet are 15% inductance
and 7% DCR at room temperature. The first decision in
designing the inductor is choosing the core material. Several
possibilities for providing low core loss at high frequencies
include the powder cores (from Micrometals, Inc., for example,
or Kool Mu? from Magnetics?) and the gapped soft ferrite cores
Most designs require the regulator output voltage, measured at
the CPU pins, to drop when the output current increases. The
specified voltage drop corresponds to a dc output resistance (R O ),
also referred to as a load line. The ADP3198 has the flexibility of
adjusting R O , independent of current-limit or compensation
components, and it can also support CPUs that do not require
a load line.
For designs requiring a load line, the impedance gain of the
CS amplifier (R CSA ) must be to be greater than or equal to the load
line. All designs, whether they have a load line or not, should
keep R CSA ≥ 1 mΩ.
The output current is measured by summing the voltage across
each inductor and passing the signal through a low-pass filter.
This summer filter is the CS amplifier configured with resistors
R PH(X) (summers), and R CS and C CS (filter). The impedance gain
of the regulator is set by the following equations, where R L is the
DCR of the output inductors:
R CSA =
R CS
R PH ( x )
C CS =
(for example, 3F3 or 3F4 from Philips). Low frequency
powdered iron cores should be avoided due to their high core
loss, especially when the inductor value is relatively low and the
ripple current is high.
× R L
L
R L × R CS
(6)
(7)
Rev. 2 | Page 20 of 31 | www.onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3199AJCPZ-RL | 功能描述:DC/DC 开关控制器 LSER SPEC VS ADP3193 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| ADP3199JCPZ-RL | 功能描述:DC/DC 开关控制器 LSER SPEC VS ADP3193 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| ADP32 | 功能描述:插座和适配器 EEROM-8U ADAPTER 32-PIN PLCC PACKAGE RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x |
| ADP320 | 制造商:AD 制造商全称:Analog Devices 功能描述:Triple, 200 mA, Low Noise, High PSRR Voltage Regulator |
| ADP3203 | 制造商:AD 制造商全称:Analog Devices 功能描述:2-Phase IMVP-II & IMVP-III Core Controller for Mobile CPUs |
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