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參數資料
| 型號： | MIC5190 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | ECONOLINE: RY & RX - Controllable Output- 1kVDC Isolation- No Heatsink Required- UL94V-0 Package Material- Toroidal Magnetics- No External Components- Fully Encapsulated- Efficiency to 70% |
| 中文描述： | 超高速，高電流有源濾波器/ LDO控制器 |
| 文件頁數： | 8/13頁 |
| 文件大?。?/td> | 169K |
| 代理商： | MIC5190 |
M
IC
5
1
9
0
Micrel
April, 2
00
4
8
M9999-
0
428
0
4
T
his places a pole at 2.
3
kHz at 8
0
dB and calculates as
follows.
F
M
pF
F
kHz
P
P
=
×
×
=
1
2
2
3
2
.
3
42
.
2
0
π
-2
0
0
2
0
4
0
60
8
0
100
0
.
01
0
.
1
1
10
100
1000
10000 100000
Frequency (KHz)
G
-45
0
45
9
0
13
5
1
8
0
225
P
Figure 4. Internal Compensation
Frequency Response
T
here is single pole roll off. For most applications, an output
capacitor is required.
T
he output capacitor and load resis-
tance create another pole.
T
his causes a two-pole system
and can potentially cause design instability with inadequate
phase margin. External compensation is required. By provid-
ing a dominant pole and zero–allowing the output capacitor
and load to provide the final pole–a net single pole roll off is
created, with the zero canceling the dominant pole. Figure 5
demonstrates placing an external capacitor (
C
CO
M
P
) and
resistor (
R
CO
M
P
) for the external pole-zero combination.
Where the dominant pole can be calculated as follows:
Error Amplifier
D
river
3
.42M
2
0
pF
I
nternal
External
C
omp
R
CO
M
P
C
CO
M
P
Figure 5. External Compensation
F
M
C
P
CO
M
P
=
×
×
1
2
3
42
.
π
And the zero can be calculated as follows:
F
R
C
Z
CO
M
P
CO
M
P
=
×
×
1
2
π
T
his allows for high
DC
gain, and high bandwidth with the
output capacitor and the load providing the final pole.
Figure 6. External Compensation
Frequency Response
I
t is recommended that the gain bandwidth should be de-
signed to be less than
1
MHz.
T
his is because most capaci-
tors lose capacitance at high frequency and becoming resis-
tive or inductive.
T
his can be difficult to compensate for and
can create high frequency ringing or worse, oscillations.
By increasing the amount of output capacitance, transient
response can be improved in multiple ways. First, the rate of
voltage drop vs. time is decreased. Also, by increasing the
output capacitor, the pole formed by the load and the output
capacitor decreases in frequency.
T
his allows for the increas-
ing of the compensation resistor, creating a higher mid-band
gain.
Figure 7. Increasing Output Capacitance
T
his will have the effect of both decreasing the voltage drop
as well as returning closer and faster to the regulated voltage
during the recovery time.
MOSFET Selection
T
he typical pass element for the M
IC
5
1
9
0
is an
N
-
C
hannel
M
OS
FE
T
.
T
here are multiple considerations when choosing
a M
OS
FE
T
.
T
hese include:
V
IN
to
V
OUT
differential
O
utput current
C
ase size/thermal characteristics
G
ate capacitance (
C
ISS
<
10
nF)
G
ate to source threshold
-2
0
0
2
0
4
0
60
8
0
100
0
.
01
0
.
1
1
10
100
1000
10000 100000
Frequency (KHz)
G
-45
0
45
9
0
13
5
1
8
0
225
P
T
he
D
ominant
P
ole
External Zero
R
LOAD
×
C
OUT
P
ole
Ccomp
M
Fp
×
×
=
42
.
2
1
Ccomp
Rcomp
Fz
×
×
=
2
1
-2
0
0
2
0
4
0
60
8
0
100
0
.
01
0
.
1
1
10
100
1000
10000 100000
Frequency (KHz)
G
-45
0
45
9
0
13
5
1
8
0
225
P
I
ncreasing
C
reduces
the load resistance and
output capacitor pole
allowing for an increase
in mid-band gain.
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| MIC5190BML TR | 功能描述:IC REG CTRLR SGL POS ADJ 10-MLF RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅動器 系列:- 產品培訓模塊:More Information on LDOs 標準包裝:2,500 系列:- 類型:正，固定式 輸出數:2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
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