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| 型号： | MIC2164-3YMM |
| 厂商： | Micrel Inc |
| 文件页数： | 18/39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 |
| 标准包装： | 100 |
| 系列： | Hyper Speed Control™ |
| PWM 型： | 混合物 |
| 输出数： | 1 |
| 频率 - 最大： | 1.25MHz |
| 占空比： | 66% |
| 电源电压： | 3 V ~ 28 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： | 576-3544-5 |
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Micrel, Inc.
R WINDING = R WINDING(20°c) × (1 + 0.0042 × (T H – T 20°C )) (17)
where:
T H = temperature of wire under full load
MIC2164/-2/-3/C
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:
T 20°C = ambient temperature
R WINDING(20°C) = room temperature winding resistance
(usually specified by the manufacturer)
I C OUT (RMS) =
Δ I L(PP)
12
(20)
Output Capacitor Selection
The type of the output capacitor is usually determined by
its ESR (equivalent series resistance). Voltage and RMS
The power dissipated in the output capacitor is:
P DISS(C OUT ) C OUT (RMS) ? ESR C OUT
= I
current capability are two other important factors for
selecting the output capacitor. Recommended capacitors
2
(21)
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
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
rating. Tantalum input capacitors may fail when
subjected to high inrush currents, caused by turning the
ESR C OUT ≤
Δ V OUT(pp)
Δ I L(PP)
(18)
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-
where:
Δ V OUT(pp) = peak-to-peak output voltage ripple
Δ I L(PP) = peak-to-peak inductor current ripple
rating. The input voltage ripple will primarily depend
upon the input capacitor’s ESR. The peak input current
is equal to the peak inductor current, so:
The total output ripple is a combination of the ESR and
output capacitance. The total ripple is calculated below:
Δ V IN = I L ( PK ) × ESR CIN
(22)
?
?
(
Δ I L(PP)
= ? ? + Δ I L(PP) ? ESR C
? C OUT ? f SW ? 8 ?
)
Δ V OUT(pp)
?
2
2
OUT
(19)
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:
where:
D = duty cycle
C OUT = output capacitance value
f SW = switching frequency
As described in the “Theory of Operation” subsection in
“Functional Description”, MIC2164/-2/-3 requires at least
20mV peak-to-peak ripple at the FB pin to make the g m
amplifier and the error comparator to behavior properly.
Also, the output voltage ripple should be in 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 are selected as the output
capacitors, such as ceramic capacitors, a ripple injection
method is applied to provide the enough FB voltage
ripples. Please refer to the “Ripple Injection” subsection
for more details.
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
(23)
(24)
September 2010
18
M9999-091310-D
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相关代理商/技术参数 |
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|---|---|
| MIC2164-3YMM TR | 功能描述:DC/DC 开关控制器 1MHz PWM 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 |
| MIC2164CYMM | 功能描述:DC/DC 开关控制器 Constant Freq Sync DC-DC 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 |
| MIC2164CYMM TR | 功能描述:DC/DC 开关控制器 Constant Freq Sync DC-DC 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 |
| MIC2164YMM | 功能描述:DC/DC 开关控制器 300kHz PWM 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 |
| MIC2164YMM TR | 功能描述:DC/DC 开关控制器 300kHz PWM 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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