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参数资料
| 型号： | MIC261203YJL EV |
| 厂商： | Micrel Inc |
| 文件页数： | 19/31页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR MIC261203YJL |
| 标准包装： | 1 |
| 系列： | HyperLight Load®, SuperSwitcher IIG™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，隔离 |
| 输出电压： | 5V |
| 电流 - 输出： | 12A |
| 输入电压： | 5.5 ~ 28 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 600kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MIC261203 |
| 其它名称： | 576-4014 |
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Micrel, Inc.
Application Information
Inductor Selection
Values for inductance, peak, and RMS currents are
required to select the output inductor. The input and
output voltages and the inductance value determine the
peak-to-peak inductor ripple current. Generally, higher
inductance values are used with higher input voltages.
Larger peak-to-peak ripple currents will increase the
power dissipation in the inductor and MOSFETs. Larger
output ripple currents will also require more output
capacitance to smooth out the larger ripple current.
Smaller peak-to-peak ripple currents require a larger
inductance value and therefore a larger and more
expensive inductor. A good compromise between size,
loss and cost is to set the inductor ripple current to be
equal to 20% of the maximum output current. The
inductance value is calculated by Equation 3:
MIC261203
Maximizing efficiency requires the proper selection of
core material and minimizing the winding resistance. The
high frequency operation of the MIC261203 requires the
use of ferrite materials for all but the most cost sensitive
applications. Lower cost iron powder cores may be used
but the increase in core loss will reduce the efficiency of
the power supply. This is especially noticeable at low
output power. The winding resistance decreases
efficiency at the higher output current levels. The
winding resistance must be minimized although this
usually comes at the expense of a larger inductor. The
power dissipated in the inductor is equal to the sum of
the core and copper losses. At higher output loads, the
core losses are usually insignificant and can be ignored.
At lower output currents, the core losses can be a
significant contributor. Core loss information is usually
available from the magnetics vendor. Copper loss in the
inductor is calculated by Equation 7:
where:
L =
V OUT × (V IN(max) ? V OUT )
V IN(max) × f sw × 20% × I OUT(max)
Eq. 3
P INDUCTOR(Cu) = I L(RMS)2 × R WINDING Eq. 7
The resistance of the copper wire, R WINDING , increases
with the temperature. The value of the winding
resistance used should be at the operating temperature.
f SW = switching frequency, 600kHz
20% = ratio of AC ripple current-to-DC output current
V IN(max) = maximum power stage input voltage
P WINDING(Ht) = R WINDING(20°C) × (1 + 0.0042 × (T H – T 20°C ))
Eq. 8
The peak-to-peak inductor current ripple is:
where:
V OUT × (V IN(max) ? V OUT )
Δ I L(pp) = Eq. 4
V IN(max) × f sw × L
The peak inductor current is equal to the average output
current plus one half of the peak-to-peak inductor current
ripple.
T H = temperature of wire under full load
T 20°C = ambient temperature
R WINDING(20°C) = room temperature winding resistance
(usually specified by the manufacturer)
Output Capacitor Selection
The type of the output capacitor is usually determined by
its equivalent series resistance (ESR). Voltage and RMS
I L(pk) =I OUT(max) + 0.5 × Δ I L(pp)
Eq. 5
current capability are two other important factors for
selecting the output capacitor. Recommended capacitor
The RMS inductor current is used to calculate the I 2 R
losses in the inductor.
types are tantalum, low-ESR aluminum electrolytic, OS-
CON and POSCAP. The output capacitor’s ESR is
usually the main cause of the output ripple. The output
capacitor ESR also affects the control loop from a
I L(RMS) = I OUT(max) +
July 2011
2
Δ I L(PP)
12
2
Eq. 6
19
stability point of view.
M9999-071311-A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC261203YJLTR | 制造商:Micrel 功能描述:DC DC Regulator 28V 12A 28Pin 5x6mm MLF |
| MIC261203YJL-TR | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.8V 1 Output 12A 28-PowerVQFN Variant, 28-MLF? 制造商:microchip technology 系列:HyperLight Load?，SuperSwitcher IIG?? 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:可调式 输出数:1 电压 - 输入（最小值）:4.5V 电压 - 输入（最大值）:28V 电压 - 输出（最小值/固定）:0.8V 电压 - 输出（最大值）:5.5V 电流 - 输出:12A 频率 - 开关:600kHz 同步整流器:是 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:28-PowerVQFN 变式，28-MLF? 供应商器件封装:28-MLF?（5x6） 标准包装:1 |
| MIC261203-ZAYJL TR | 制造商:Micrel Inc 功能描述:IC REG BUCK SYNC ADJ 12A 28MLF |
| MIC2619YD6 | 制造商:Micrel 功能描述:1.2MHz PWM Boost Converter with OVP |
| MIC2619YD6 TR | 功能描述:直流/直流开关转换器 1.2MHz PWM Boost Converter with OVP in Thin SOT-23 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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