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| 型号： | MIC2174-1YMM |
| 厂商： | Micrel Inc |
| 文件页数： | 16/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 10-MSOP |
| 产品培训模块： | MIC2124 Synchronous Current Mode DC-DC Buck Controller |
| 特色产品： | MIC2174 Buck Controller |
| 标准包装： | 100 |
| 系列： | Hyper Speed Control™ |
| PWM 型： | 混合物 |
| 输出数： | 1 |
| 频率 - 最大： | 375kHz |
| 占空比： | 87% |
| 电源电压： | 3 V ~ 40 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： | 管件 |
| 产品目录页面： | 1092 (CN2011-ZH PDF) |
| 其它名称： | 576-3546-5 |
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I C OUT (RMS) =
Δ I L(PP)
Micrel, Inc.
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
selecting the output capacitor. Recommended capacitors
MIC2174/MIC2174C
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 below:
(21)
12
The power dissipated in the output capacitor is:
P DISS(C OUT ) C OUT (RMS) × ESR C OUT
= I
are tantalum, low-ESR aluminum electrolytic, OS-CON
and POSCAPS. The output capacitor’s ESR is usually
the main cause of the output ripple. The output capacitor
2
(22)
ESR also affects the control loop from a stability point of
view. The maximum value of ESR is calculated:
Input Capacitor Selection
The input capacitor for the power stage input V HSD
should be selected for ripple current rating and voltage
ESR C OUT ≤
Δ V OUT(pp)
Δ I L(PP)
(19)
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
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 below:
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 peak inductor current, so:
= ? ?
?
(
Δ I L(PP)
C OUT × f SW × 8 ? ?
)
Δ V OUT(pp)
where:
?
?
2
? + Δ I L(PP) × ESR C
2
OUT
(20)
Δ V IN = I L(pk) × ESR CIN (23)
The input capacitor must be rated for the input current
ripple. The RMS value of input capacitor current is
determined at the maximum output current. Assuming
the peak-to-peak inductor current ripple is low:
D = duty cycle
C OUT = output capacitance value
f SW = switching frequency
As described in the “Theory of Operation” subsection in
Functional Description , the MIC2174/MIC2174C requires
at least 20mV peak-to-peak ripple at the FB pin to make
the gm amplifier and the error comparator to behavior
properly. Also, the output voltage ripple should be in
I CIN(RMS) ≈ I OUT(max) × D × (1 ? D)
The power dissipated in the input capacitor is:
P DISS(CIN) = I CIN(RMS)2 × ESR CIN
(24)
(25)
phase with the inductor current. Therefore, the output
voltage ripple caused by the output capacitor C OUT
should be much 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 FB voltage ripple. Please refer to the
“Ripple Injection” subsection for more details.
External Schottky Diode (Optional)
An external freewheeling diode, which is not necessary,
is used to keep the inductor current flow continuous
while both MOSFETs are turned off. This dead-time
prevents current from flowing unimpeded through both
MOSFETs and is typically 30ns. The diode conducts
twice during each switching cycle. Although the average
current through this diode is small, the diode must be
able to handle the peak current.
September 2010
16
M9999-091310-C
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2174-1YMM 3A EV | 功能描述:电源管理IC开发工具 300kHz Synch Current Mode PWM 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 |
| MIC2174-1YMM TR | 功能描述:DC/DC 开关控制器 300kHz Synch Current Mode PWM 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 |
| MIC2174C | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Synchronous Buck Controller Featuring Adaptive On-Time Control 40V Input, 300kHz |
| MIC2174C-1YMM | 功能描述:DC/DC 开关控制器 Low Cost 40V 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 |
| MIC2174C-1YMM TR | 功能描述:DC/DC 开关控制器 Low Cost 40V 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 |
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