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参数资料
| 型号： | MAX15039EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX15039 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 0.6 ~ 4.5V |
| 电流 - 输出： | 6A |
| 输入电压： | 2.9 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX15039 |
6A, 2MHz Step-Down Regulator
with Integrated Switches
Inductor Selection
Choose an inductor with the following equation:
evaluation circuit. A smaller ripple current results in less
output-voltage ripple. Since the inductor ripple current
L =
V OUT × ( V IN ? V OUT )
f S × V IN × LIR × I OUT ( MAX )
is a factor of the inductor value, the output-voltage rip-
ple decreases with larger inductance. Use ceramic
capacitors for low ESR and low ESL at the switching
frequency of the converter. The ripple voltage due to
V RIPPLE ( C ) =
C IN _ MIN =
V RIPPLE ( ESL ) = P ? P x ESL
where LIR is the ratio of the inductor ripple current to full
load current at the minimum duty cycle. Choose LIR
between 20% to 40% for best performance and stability.
Use an inductor with the lowest possible DC resistance
that fits in the allotted dimensions. Powdered iron ferrite
core types are often the best choice for performance.
With any core material, the core must be large enough
not to saturate at the current limit of the MAX15039.
Output-Capacitor Selection
The key selection parameters for the output capacitor are
capacitance, ESR, ESL, and voltage-rating requirements.
These affect the overall stability, output ripple voltage,
and transient response of the DC-DC converter. The out-
put ripple occurs due to variations in the charge stored
in the output capacitor, the voltage drop due to the
capacitor ’s ESR, and the voltage drop due to the
capacitor’s ESL. Estimate the output-voltage ripple due
to the output capacitance, ESR, and ESL:
V RIPPLE = V RIPPLE ( C ) + V RIPPLE ( ESR ) + V RIPPLE ( ESL )
where the output ripple due to output capacitance,
ESR, and ESL is:
I P ? P
8 x C OUT x f S
V RIPPLE ( ESR ) = I P ? P x E S R
I
t ON
ESL is negligible when using ceramic capacitors.
Load-transient response depends on the selected out-
put capacitance. During a load transient, the output
instantly changes by ESR x Δ I LOAD . Before the con-
troller can respond, the output deviates further,
depending on the inductor and output capacitor val-
ues. After a short time, the controller responds by regu-
lating the output voltage back to its predetermined
value. The controller response time depends on the
closed-loop bandwidth. A higher bandwidth yields a
faster response time, preventing the output from deviat-
ing further from its regulating value. See the Compen-
sation Design section for more details.
Input-Capacitor Selection
The input capacitor reduces the current peaks drawn
from the input power supply and reduces switching
noise in the IC. The total input capacitance must be
equal or greater than the value given by the following
equation to keep the input-ripple voltage within specifi-
cation and minimize the high-frequency ripple current
being fed back to the input source:
D x T S xI OUT
V IN - RIPPLE
where V IN-RIPPLE is the maximum allowed input ripple
voltage across the input capacitors and is recommend-
ed to be less than 2% of the minimum input voltage. D
is the duty cycle (V OUT /V IN ) and T S is the switching
period (1/f S ).
The impedance of the input capacitor at the switching
frequency should be less than that of the input source so
V RIPPLE ( ESL ) = P ? P x ESL
or:
I
t OFF
high-frequency switching currents do not pass through
the input source, but are instead shunted through the
input capacitor. The input capacitor must meet the ripple
or whichever is larger.
The peak-to-peak inductor current (I P-P ) is:
current requirement imposed by the switching currents.
The RMS input ripple current is given by:
I P ? P = IN OUT x OUT
V ? V V
f S × L V IN
I RIPPLE = I LOAD ×
V OUT × ( V IN ? V OUT )
V IN
Use these equations for initial output-capacitor selec-
tion. Determine final values by testing a prototype or an
where I RIPPLE is the input RMS ripple current.
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15039EVKIT+ | 功能描述:电源管理IC开发工具 6A 2MHz Step-Down w/Integrated Switch 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 |
| MAX1503XETJ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1503YETJ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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| MAX15040EVKIT+ | 制造商:Maxim Integrated Products 功能描述:HIGH EFFICIENCY 4A DC/DC REGULATOR - Rail/Tube |
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