参数资料
| 型号： | MIC26600YJL TR |
| 厂商： | Micrel Inc |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 7A 28-MLF |
| 产品培训模块： | SuperSwitcherII™ - Step Down DC-DC Regulator Family |
| 标准包装： | 1 |
| 系列： | Hyper Speed Control™，SuperSwitcher II™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.8V |
| 输入电压： | 4.5 V ~ 26 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 7A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VQFN 裸露焊盘，28-MLF? |
| 包装： | 标准包装 |
| 供应商设备封装： | 28-MLF?（5x6） |
| 其它名称： | 576-3716-6 |
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Micrel, Inc.
The total output ripple is a combination of the ESR and
output capacitance. The total ripple is calculated in
Equation 11:
MIC26600
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)
?
?
2
? + Δ I L(PP) × ESR C
OUT
2
Δ V IN = I L(pk) × ESR CIN (14)
The input capacitor must be rated for the input current
where:
(11)
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
I CIN(RMS) ≈ I OUT(max) × D × (1 ? D)
(15)
f SW = switching frequency
The power dissipated in the input capacitor is:
As described in the “Theory of Operation” subsection in
“Functional Description”, the MIC26600 requires at least
20mV peak-to-peak ripple at the FB pin to make the g m
amplifier and the error comparator behave properly. Also,
P DISS(CIN) = I CIN(RMS)2 × ESR CIN
(16)
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
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 12:
Ripple Injection
The V FB ripple required for proper operation of the
MIC26600 g m amplifier and error comparator is 20mV to
100mV. However, the output voltage ripple is generally
designed as 1% to 2% of the output voltage. For a low
output voltage, such as a 1V, the output voltage ripple is
only 10mV to 20mV, and the feedback voltage ripple is
less than 20mV. If the feedback voltage ripple is so small
that the g m amplifier and error comparator can’t sense it,
then the MIC26600 will lose control and the output
voltage is not regulated. In order to have some amount
of V FB ripple, a ripple injection method is applied for low
output voltage ripple applications.
I C OUT (RMS) =
Δ I L(PP)
12
(12)
The applications are divided into three situations
according to the amount of the feedback voltage ripple:
1) Enough ripple at the feedback voltage due to the large
ESR of the output capacitors.
The power dissipated in the output capacitor is:
As shown in Figure 5a, the converter is stable without
any ripple injection. The feedback voltage ripple is:
P DISS(C OUT ) C OUT (RMS) × ESR C OUT
= I
Input Capacitor Selection
2
(13)
Δ V FB(pp) =
R2
R1 + R2
× ESR C OUT × Δ I L (pp)
(17)
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.
where Δ I L(pp) is the peak-to-peak value of the inductor
current ripple.
2) Inadequate ripple at the feedback voltage due to the
small ESR of the output capacitors.
July 2011
18
M9999-070111-C
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