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參數(shù)資料
| 型號： | AX1928EUB25 |
| 英文描述： | SMPS Controller |
| 中文描述： | 開關(guān)電源控制器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 303K |
| 代理商： | AX1928EUB25 |
M
For the MAX1928:
Resistors R1 and R2 are external to the MAX1927 (see
the
Setting the Output Voltage
section). I
OUT(MAX)
is the
maximum output current, R
CS
= 0.48V/A, and g
m
=
250μS for the MAX1927. See the
Electrical Characteristics
table for MAX1928 g
m
values. Select the closest standard
C
C
value that gives an acceptable bandwidth.
3) Calculate the equivalent load impedance, R
L
, by:
4) Calculate the compensation resistance (R
C
) to can-
cel out the dominant pole created by the output
load and the output capacitance:
Solving for R
C
gives:
5) Calculate the high-frequency compensation pole to
cancel the zero created by the output capacitor
’
s ESR:
1
2
1
2
π
π
×
×
=
×
×
R
C
R
C
ESR
OUT
C
f
R
R
C
C
C
L
OUT
C
=
×
1
2
1
2
π
π
×
×
=
×
×
R
C
R
C
L
OUT
C
C
R
V
I
L
OUT
(
OUT MAX
=
)
C
V
I
R
g
f
C
OUT
(
OUT MAX
CS
m
C
=
×
(
)
×
)
1
1
2
π
Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
10
______________________________________________________________________________________
BATT
COMP
GND
REF
PGND
LX
POK
FB
V
IN
2.6V TO 5.5V
C1
10
μ
F
C2
10
μ
F
C
C
1200pF
R
C
18k
L1
CDRH4D18
4.7
μ
H
V
OUT
1.8V AT 800mA
SHDN
PWM
MAX1928-18
C
f
22pF
C3
0.1
μ
F
Figure 3. Applications Circuit for the MAX1928
BATT
COMP
REF
PGND
LX
POK
FB
V
IN
2.6V TO 5.5V
C1
10
μ
F
C2
10
μ
F
C
C
680pF
R
C
15k
L1
CDRH4D18
4.7
μ
H
V
OUT
1V AT 800mA
SHDN
MAX1927R
C
f
22pF
C3
0.1
μ
F
R1
16.5k
1%
R2
49.9k
1%
GND
PWM
Figure 4. Applications Circuit for the MAX1927
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