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| 型号： | MAX5060EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/31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
V CL ? I L
Applications Information
Inductor Selection
The switching frequency, peak inductor current, and
allowable ripple at the output determine the value and
size of the inductor. Selecting higher switching frequen-
cies reduces the inductance requirement, but at the
cost of lower efficiency. The charge/discharge cycle of
the gate and drain capacitances in the switching
MOSFETs create switching losses. The situation wors-
ens at higher input voltages, since switching losses are
proportional to the square of the input voltage. The
MAX5060 can operate up to 1.5MHz, however for V IN >
+12V, use lower switching frequencies to limit the
switching losses.
Use the following equation to determine the minimum
inductance value:
The average-current-mode control feature of the
MAX5060/MAX5061 limits the maximum peak inductor
current and prevents the inductor from saturating. Choose
an inductor with a saturating current greater than the
worst-case peak inductor current. The hiccup current-limit
circuit is masked during startup to avoid unintentional
hiccup when large output capacitors are used.
Use the following equation to determine the worst-case
inductor current:
L LPEAK = +
R S 2
where R S is the sense resistor and V CL = 0.0282V.
Switching MOSFETs
When choosing a MOSFET for voltage regulators, con-
L MIN =
( V INMAX ? V OUT ) × V OUT
V INMAX × f SW × ? I L
sider the total gate charge, R DS(ON) , power dissipation,
and package thermal impedance. The product of the
MOSFET gate charge and on-resistance is a figure of
merit, with a lower number signifying better perfor-
Choose ? I L equal to approximately 40% of the output
current. Since ? I L affects the output-ripple voltage, the
inductance value may need minor adjustment after
choosing the output capacitors. Higher values reduce
the output ripple, but at the cost of degraded transient
response. Lower values have higher output ripple but
better transient response. Also, lower inductor values
correspond to smaller magnetics.
Choose inductors from the standard high-current, surface-
mount inductor series available from various manufac-
turers. Particular applications may require custom-
made inductors. Use high-frequency core material for
custom inductors. High ? I L causes large peak-to-peak
flux excursion, which increases the core losses at higher
frequencies. The high-frequency operation coupled with
high ? I L reduces the required minimum inductance and
even makes the use of planar inductors possible. The
mance. Choose MOSFETs optimized for high-frequen-
cy switching applications.
The average current from the MAX5060/MAX5061 gate-
drive output is proportional to the total capacitance it
drives at DH and DL. The power dissipated in the
MAX5060/MAX5061 is proportional to the input voltage
and the average drive current. See the IN, V CC , and
V DD section to determine the maximum total gate
charge allowed from the combined driver outputs.
The gate charge and drain capacitance (CV2) loss, the
cross-conduction loss in the upper MOSFET due to finite
rise/fall time, and the I2R loss due to RMS current in the
MOSFET R DS(ON) account for the total losses in the
MOSFET. Estimate the power loss (PD MOS_ ) caused by
the high-side and low-side MOSFETs using the following
equations:
(
? V IN × I OUT × ( t R + t F ) × f SW ? 2
? ? + 1 . 4 R DS ( ON ) × I RMS ? HI
? ?
advantages of using planar magnetics include low-profile
design, excellent current-sharing between modules due
to the tight control of parasitics, and low cost.
For example, calculate the minimum inductance at
V IN(MAX) = 13.2V, V OUT = 1.8V, ? I L = 8A, and f SW =
PD MOS ? HI = ( Q G × V DD × f SW ) +
4
)
330kHz:
L MIN =
( 13 . 2 ? 1 . 8 ) × 1 . 8
13 . 2 × 330 k × 8
= 0 . 6 μ H
where Q G , R DS(ON) , t R , and t F are the upper-switching
MOSFET’s total gate charge, on-resistance at +25°C,
rise time, and fall time, respectively.
24
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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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