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| 型号： | MAX15023EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/28页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR MAX15023 CTLR |
| 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： | 2，非隔离 |
| 输出电压： | 1.2V，3.3V |
| 电流 - 输出： | 10A，5A |
| 输入电压： | 9 ~ 16 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX15023 |
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MAX15023
Wide 4.5V to 28V Input, Dual-Output
Synchronous Buck Controller
? V Q =
? I L =
The output voltage ripple as a consequence of the ESR
and the output capacitance is:
? V ESR = ? I L × ESR
? I L
8 × C OUT × f SW
( V IN ? V OUT ) × V OUT
V IN × f SW × L
where ? I L is the peak-to-peak inductor current ripple
(see the Inductor Selection section). These equations
are suitable for initial capacitor selection, but final val-
ues should be verified by testing in a prototype or eval-
uation circuit.
As a general rule, a smaller inductor ripple current
results in less output ripple voltage. The output capaci-
tor must be also checked against load-transient
response requirements. The allowable deviation of the
output voltage during fast load transients also deter-
mines the output capacitance, its ESR, and its equiva-
lent series inductance (ESL). The output capacitor
supplies the load current during a load step until the
Compensation
Each channel of the MAX15023 provides an internal
transconductance amplifier with its inverting input and
its output available to the user for external frequency
compensation. The flexibility of external compensation
for each converter offers wide selection of output filter-
ing components, especially the output capacitor. For
cost-sensitive applications, use low-ESR aluminum
electrolytic capacitors; for component-size sensitive
applications, use low-ESR tantalum, polymer, or ceram-
ic capacitors at the output. The high switching frequen-
cy of the MAX15023 allows use of ceramic capacitors
at the output. Choose the small-signal components for
the error amplifier to achieve the desired closed-loop
bandwidth and phase margin.
To choose the appropriate compensation network type,
the power-supply poles and zeros, the zero crossover
frequency, and the type of the output capacitor must be
determined.
In a buck converter, the LC filter in the output stage
introduces a pair of complex poles at the following fre-
quency:
controller responds with a greater duty cycle. The
response time (t RESPONSE ) depends on the closed-
loop bandwidth of the converter (see the Compensation
f PO =
1
2 π × L OUT × C OUT
section). The resistive drop across the output capaci-
tor’s ESR, the drop across the capacitor’s ESL ( ? V ESL ),
and the capacitor discharge causes a voltage droop
The output capacitor and its ESR also introduce a zero
at:
during the load step.
Use a combination of low-ESR tantalum/aluminum elec-
trolytic or polymer and ceramic capacitors for better
f ZO =
1
2 π × ESR × C OUT
? V ESR
f O ≤ SW
C OUT = STEP RESPONSE
? V ESL × t STEP
t RESPONSE ?
transient load and voltage ripple performance. Non-
leaded capacitors and capacitors in parallel help
reduce the ESL. Keep the maximum output voltage
deviation below the tolerable limits of the load. Use the
following equations to calculate the required ESR, ESL,
and capacitance value during a load step:
ESR =
I STEP
I × t
? V Q
ESL =
I STEP
1
3 × f O
where I STEP is the load step, t STEP is the rise time of the
load step, t RESPONSE is the response time of the con-
troller, and f O is the closed-loop crossover frequency.
Maxim Integrated
The loop-gain crossover frequency (f O , where the loop
gain equals 1 (0dB)) should be set below 1/10 the
switching frequency:
f
10
Choosing a lower crossover frequency might also help
in reducing the effects of noise pickup into the feed-
back loop, such as jittery duty cycle.
In order to maintain a stable system, two stability crite-
ria must be met:
1) The phase shift at the crossover frequency f O , must
be less than 180°. In other words, the phase margin
of the loop must be greater than zero.
2) The gain at the frequency where the phase shift is
-180° (gain margin) must be less than 1.
19
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| MAX15023EVKIT+ | 功能描述:电源管理IC开发工具 MAX15023 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 |
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| MAX15024AATB/V+T | 功能描述:功率驱动器IC Single Low Side RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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| MAX15024AATB+T | 功能描述:功率驱动器IC Single Low Side RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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