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| 型号： | MAX17030EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 34/39页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX17030 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | Quick-PWM™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 0 ~ 1.5 V |
| 输入电压： | 7 ~ 26 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： | MAX17030 |
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1/2/3-Phase Quick-PWM
IMVP-6.5 VID Controllers
I PEAK = ?
? ? 1 + 2 ? ?
f ESR ≤ SW
Find a low-loss inductor having the lowest possible DC
resistance that fits in the allotted dimensions. The core
must not to saturate at the peak inductor current (I PEAK ):
? I LOAD ( MAX ) ? ? LIR ?
? η TOTAL ? ?
Output Capacitor Selection
Output capacitor selection is determined by the con-
troller stability requirements, and the transient soar and
Output Capacitor Stability Considerations
For Quick-PWM controllers, stability is determined by
the value of the ESR zero relative to the switching fre-
quency. The boundary of instability is given by the fol-
lowing equation:
f
π
where:
sag requirements of the application.
Output Capacitor ESR
The output filter capacitor must have low enough effec-
f ESR =
1
2 π R EFF C OUT
( R ESR PCB ) ≤ Δ I
+ R
? ? ( V IN TOTAL OUT OUT ? ?
) V
R ESR ≤ ? ? V RI P PLE
tive series resistance (ESR) to meet output ripple and
load-transient requirements, yet have high enough ESR
to satisfy stability requirements.
In CPU V CORE converters and other applications where
the output is subject to large load transients, the output
capacitor’s size typically depends on how much ESR is
needed to prevent the output from dipping too low under a
load transient. Ignoring the sag due to finite capacitance:
V STEP
LOAD ( MAX )
The output ripple voltage of a step-down controller
equals the total inductor ripple current multiplied by the
output capacitor’s ESR. When operating multiphase
systems out-of-phase, the peak inductor currents of
each phase are staggered, resulting in lower output rip-
ple voltage by reducing the total inductor ripple current.
For multiphase operation, the maximum ESR to meet
ripple requirements is:
? V IN f SW L ?
? η V
where η TOTAL is the total number of active phases and
f SW is the switching frequency per phase. The actual
capacitance value required relates to the physical size
needed to achieve low ESR, as well as to the chemistry
of the capacitor technology. Thus, the capacitor is usu-
ally selected by ESR and voltage rating rather than by
capacitance value (this is true of polymer types).
When using low-capacity ceramic filter capacitors,
capacitor size is usually determined by the capacity
needed to prevent V SAG and V SOAR from causing prob-
lems during load transients. Generally, once enough
capacitance is added to meet the overshoot require-
ment, undershoot at the rising load edge is no longer a
problem (see the V SAG and V SOAR equations in the
Transient Response section).
and:
R EFF = R ESR + R DROOP + R PCB
where C OUT is the total output capacitance, R ESR is the
total equivalent series resistance, R DROOP is the volt-
age-positioning gain, and R PCB is the parasitic board
resistance between the output capacitors and sense
resistors.
For a standard 300kHz application, the ESR zero fre-
quency must be well below 95kHz, preferably below
50kHz. Tantalum, SANYO POSCAP, and Panasonic SP
capacitors in widespread use at the time of publication
have typical ESR zero frequencies below 50kHz. In the
standard application circuit, the ESR needed to support
a 30mV P-P ripple is 30mV/(40A x 0.3) = 2.5m Ω . Four
330μF/2.5V Panasonic SP (type SX) capacitors in paral-
lel provide 1.5m Ω (max) ESR. With a 2m Ω droop and
0.5m Ω PCB resistance, the typical combined ESR
results in a zero at 30kHz.
Ceramic capacitors have a high ESR zero frequency, but
applications with significant voltage positioning can take
advantage of their size and low ESR. When using only
ceramic output capacitors, output overshoot (V SOAR )
typically determines the minimum output capacitance
requirement. Their relatively low capacitance value
favors high switching-frequency operation with small
inductor values to minimize the energy transferred from
inductor to capacitor during load-step recovery.
Unstable operation manifests itself in two related but
distinctly different ways: double-pulsing and feedback
loop instability. Double pulsing occurs due to noise on
the output or because the ESR is so low that there is not
enough voltage ramp in the output-voltage signal. This
“fools” the error comparator into triggering a new cycle
immediately after the minimum off-time period has
expired. Double pulsing is more annoying than harmful,
resulting in nothing worse than increased output ripple.
34
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17030EVKIT+ | 功能描述:电源管理IC开发工具 MAX17030 Eval Kit 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 |
| MAX17030GTL+ | 功能描述:电压模式 PWM 控制器 1/2/3-Phase PWM IMVP-6.5 VID Ctlr RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17030GTL+T | 功能描述:电压模式 PWM 控制器 1/2/3-Phase PWM IMVP-6.5 VID Ctlr RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17031ETG+ | 功能描述:电压模式 PWM 控制器 Dual PWM Step-Down Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17031ETG+T | 功能描述:电压模式 PWM 控制器 Dual PWM Step-Down Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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