参数资料
| 型号： | MIC2166YMME TR |
| 厂商： | Micrel Inc |
| 文件页数： | 16/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM HYBRID 10TSOP |
| 标准包装： | 2,500 |
| 系列： | Hyper Speed Control™ |
| PWM 型： | 混合物 |
| 输出数： | 1 |
| 频率 - 最大： | 750kHz |
| 占空比： | 82% |
| 电源电压： | 4.5 V ~ 28 V |
| 降压： | 无 |
| 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）裸露焊盘 |
| 包装： | 带卷 (TR) |
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Micrel, Inc.
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.
MIC2166
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
R WINDING = R WINDING(20°C) ×
(1+ 0.0042 × (T H – T 20°C ))
where:
T H = temperature of wire under full load
(17)
voltage ripples. 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 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:
current capability are two other important factors for
selecting the output capacitor. Recommended capacitors
are tantalum, low-ESR aluminum electrolytic, OS-CON,
POSCAPS, and ceramic. The output capacitor’s ESR is
P DISS(C OUT ) = I C OUT (RMS) 2 × ESR C OUT
(21)
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 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 on a “hot-
ESR C OUT ≤
Δ V OUT(pp)
Δ I L(PP)
(18)
plugging”. 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
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
higher inrush currents without voltage de-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:
Δ V IN L ( PK ) × ESR C IN
output capacitance. The total ripple is calculated below:
= I
(22)
(
?
?
Δ I L(PP)
Δ V OUT(PP) = ? ? + Δ I L(PP) × ESR C
? C OUT × f SW × 8 ?
2
OUT
) 2
(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
where:
the peak-to-peak inductor current ripple is low:
P DISS ( C IN ) C IN ( RMS ) 2 × ESR C IN
C OUT = output capacitance value
f SW = switching frequency
As described in the “Theory of Operation” subsection in
“Functional Description”, MIC2166 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
I C IN ( RMS ) ≈ I OUT (max) × D × ( 1 ? D )
The power dissipated in the input capacitor is:
= I
(23)
(24)
September 2010
16
M9999-092410-C
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| MIC2168ABMM | 功能描述:IC REG CTRLR BUCK PWM VM 10-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| MIC2168ABMM TR | 功能描述:IC REG CTRLR BUCK PWM VM 10-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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