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参数资料
| 型号： | MIC2176-1YMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 19/31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.
Copper loss in the inductor is calculated by Equation 18:
where:
D = duty cycle
MIC2176
P INDUCTOR(Cu) = I L(RMS)2 × R WINDING
(18)
C OUT = output capacitance value
f sw = switching frequency
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.
As described in the “Theory of Operation” subsection in
Functional Description , the MIC2176 requires at least
P WINDING(Ht) = R WINDING(20°C) ×
(1 + 0.0042 × (T H – T 20°C ))
(19)
20mV peak-to-peak ripple at the FB pin to make the g m
amplifier and the error comparator behave properly. Also,
the output voltage ripple should be in phase with the
inductor current. Therefore, the output voltage ripple
caused by the output capacitors value should be much
where:
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 ESR (equivalent series resistance). Voltage and RMS
current capability are two other important factors for
smaller than the ripple caused by the output capacitor
ESR. If low ESR capacitors, such as ceramic capacitors,
are selected as the output capacitors, a ripple injection
method should be applied to provide the enough
feedback voltage ripple. Please refer to the “Ripple
Injection” subsection for more details.
The voltage rating of the capacitor should be twice the
output voltage for a tantalum and 20% greater for
aluminum electrolytic or OS-CON. The output capacitor
RMS current is calculated in Equation 22:
selecting the output capacitor. Recommended capacitor
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
I C OUT (RMS) =
Δ I L(PP)
12
(22)
capacitor ESR also affects the control loop from a
stability point of view. The maximum value of ESR is
calculated:
The power dissipated in the output capacitor is:
P DISS(C OUT ) = I C OUT (RMS) × ESR C OUT
ESR C OUT ≤
Δ V OUT(pp)
Δ I L(PP)
(20)
Input Capacitor Selection
2
(23)
where:
Δ V OUT(pp) = peak-to-peak output voltage ripple
Δ I L(PP) = peak-to-peak inductor current ripple
The total output ripple is a combination of the ESR and
output capacitance. The total ripple is calculated in
Equation 21:
The input capacitor for the power stage input V IN should
be selected for ripple current rating and voltage rating.
Tantalum input capacitors may fail when subjected to
high inrush currents, caused by turning the input supply
on. A tantalum input capacitor’s voltage rating should be
at least two times the maximum input voltage to
maximize reliability. Aluminum electrolytic, OS-CON, and
multilayer polymer film capacitors can handle the higher
inrush currents without voltage de-rating. The input
voltage ripple will primarily depend on the input
capacitor’s ESR. The peak input current is equal to the
?
?
(
Δ I L(PP)
= ? ? + Δ I L(PP) × ESR C
? C OUT × f SW × 8 ?
)
Δ V OUT(pp)
?
2
OUT
2
peak inductor current, so:
Δ V IN = I L(pk) × ESR CIN
(24)
(21)
November 2010
19
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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