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参数资料
| 型号： | MIC2176-1YMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 18/31页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 10-MSOP |
| 标准包装： | 2,500 |
| 系列： | Hyper Speed Control™ |
| PWM 型： | 混合物 |
| 输出数： | 1 |
| 频率 - 最大： | 125kHz |
| 占空比： | 96% |
| 电源电压： | 4.5 V ~ 75 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
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Micrel, Inc.
Making the assumption that the turn-on and turn-off
transition times are equal; the transition times can be
MIC2176
The inductance value is calculated by Equation 14:
C ISS × V IN + C OSS × V HSD
approximated by:
t T =
I G
(12)
where:
L =
V OUT × (V IN(max) ? V OUT )
V IN(max) × f sw × 20% × I OUT(max)
(14)
where:
C ISS and C OSS are measured at V DS = 0
I G = Gate-drive current
The total high-side MOSFET switching loss is:
f SW = Switching frequency, 300kHz
20% = Ratio of AC ripple current to DC output current
V IN(max) = Maximum power stage input voltage
The peak-to-peak inductor current ripple is:
P AC = (V HSD + V D ) × I PK × t T × f SW
(13)
Δ I L(pp) =
V OUT × (V IN(max) ? V OUT )
V IN(max) × f sw × L
(15)
where:
t T = Switching transition time
V D = Body diode drop (0.5V)
f SW = Switching Frequency
The peak inductor current is equal to the average output
current plus one half of the peak-to-peak inductor current
ripple.
The high-side MOSFET switching losses increase with
I L(pk) =I OUT(max) + 0.5 × Δ I L(pp)
(16)
the switching frequency and the input voltage V HSD . The
low-side MOSFET switching losses are negligible and
can be ignored for these calculations.
The RMS inductor current is used to calculate the I 2 R
losses in the inductor.
I L(RMS) = I OUT(max) +
Inductor Selection
Values for inductance, peak, and RMS currents are
required to select the output inductor. The input and
2
Δ I L(PP)
12
2
(17)
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.
Maximizing efficiency requires the proper selection of
core material and minimizing the winding resistance. The
high frequency operation of the MIC2176 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.
November 2010
18
M9999-111710-A
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相关代理商/技术参数 |
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|---|---|
| MIC2176-2 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Wide Input Voltage, Synchronous Buck Controllers Featuring Adaptive On-Time Control |
| MIC2176-2YMM | 功能描述:DC/DC 开关控制器 76V Synchronous Buck Controller 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 |
| MIC2176-2YMM 5A EV | 功能描述:电源管理IC开发工具 76V Synchronous Buck Controller - Evaluation Board 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 |
| MIC2176-2YMM TR | 功能描述:DC/DC 开关控制器 76V Synchronous Buck Controller 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 |
| MIC2176-3 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Wide Input Voltage, Synchronous Buck Controllers Featuring Adaptive On-Time Control |
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