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| 型号： | MAX5060EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/31页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX5060 |
| 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： | 3.3V |
| 电流 - 输出： | 20A |
| 输入电压： | 10 ~ 14V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 270kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX5060 |
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0.6V to 5.5V Output, Parallelable,
Average-Current-Mode DC-DC Controllers
( I DC + I PK + I )
I RMS ? HI =
DC PK ×
× I
( ? V ESR )
ESR IN =
? I OUT +
? ? I L ?
?
2 ?
I OUT × D ( 1 ? D )
C IN =
2 2 D
3
where D = V OUT /V IN , I DC = (I OUT - ? I L /2) and I PK =
(I OUT + ? I L /2).
PD MOS ? LO = ( Q G × V DD × f SW ) +
?
? V Q × f SW
where I OUT is the output current of the converter.
? 2 × C
(
× V 2 × f
?
? + 1 . 4 R DS ( ON ) × I RMS ? LO
?
?
?
( I DC + I PK + I
)
2 2 ( 1 ? D )
I RMS ? LO = DC × I PK ×
3
OSS IN SW 2
3
)
For example, at V OUT = 1.8V, the ESR and input capac-
itance are calculated for the input peak-to-peak ripple
of 100mV or less yielding an ESR and capacitance
value of 1.25m ? and 110μF.
Output Capacitors
The worst-case peak-to-peak and capacitor RMS ripple
? V OESR
? I L
C OUT =
where C OSS is the MOSFET drain-to-source capaci-
tance.
For example, from the typical specifications in the
Applications Information section with V OUT = 1.8V, the
high-side and low-side MOSFET RMS currents are 7.8A
and 18.5A, respectively for 20A. Ensure that the ther-
mal impedance of the MOSFET package keeps the
junction temperature at least +25°C below the absolute
maximum rating. Use the following equation to calcu-
late maximum junction temperature:
T J = (PD MOS x θ JA ) + T A
where θ JA and T A are the junction-to-ambient thermal
impedance and ambient temperature, respectively.
Input Capacitors
The discontinuous input-current waveform of the buck
converter causes large ripple currents in the input capac-
itor. The switching frequency, peak inductor current, and
the allowable peak-to-peak voltage ripple reflected back
to the source dictate the capacitance requirement.
Increasing switching frequency or paralleling multiple out-
of-phase converters lowers the peak-to-average current
ratio, yielding a lower input capacitance requirement for
the same load current.
The input ripple is comprised of ? V Q (caused by the
capacitor discharge) and ? V ESR (caused by the ESR of
the capacitor). Use low-ESR ceramic capacitors with
high-ripple-current capability at the input. Assume the
contributions from the ESR and capacitor discharge are
equal to 30% and 70%, respectively. Calculate the input
capacitance and ESR required for a specified ripple
using the following equation:
current, the allowable peak-to-peak output ripple volt-
age, and the maximum deviation of the output voltage
during step loads determine the capacitance and the
ESR requirements for the output capacitors.
In buck converter design, the output-current waveform
is continuous and this reduces peak-to-peak ripple cur-
rent in the output capacitor equal to the inductor ripple
current. Calculate the capacitance, the ESR of the out-
put capacitor, and the RMS ripple current rating of the
output capacitor based on the following equations.
ESR OUT =
? I L
8 × ? V OQ × f SW
where ? V OESR and ? V OQ are the output-ripple contri-
butions due to ESR and the discharge of output capaci-
tor, respectively.
In the dynamic load environment, the allowable devia-
tion of output voltage during the fast transient load dic-
tates the output capacitance and ESR. The output
capacitors supply the load step until the controller
responds with a greater duty cycle. The response time
(t RESPONSE ) depends on the closed-loop bandwidth of
the converter. The resistive drop across the capacitor
ESR and capacitor discharge causes a voltage drop
during a step load. Use a combination of SP polymer
and ceramic capacitors for better transient load and
ripple/noise performance.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5061 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:0.6V to 5.5V Output, Parallelable, Average-Current-Mode DC-DC Controllers |
| MAX5061AUE | 功能描述:DC/DC 开关控制器 .6-5.5V Parallelable Average-Current-Mode 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 |
| MAX5061AUE+ | 功能描述:DC/DC 开关控制器 .6-5.5V Parallelable Average-Current-Mode 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 |
| MAX5061AUE+T | 功能描述:DC/DC 开关控制器 .6-5.5V Parallelable Average-Current-Mode 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 |
| MAX5061AUE-T | 功能描述:DC/DC 开关控制器 .6-5.5V Parallelable Average-Current-Mode 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 |
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