MP1583 MPS, MP1583 Datasheet - Page 8
MP1583
Manufacturer Part Number
MP1583
Description
Step Down Converter
Manufacturer
MPS
Datasheet
1.MP1583.pdf
(11 pages)
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Determine if the second compensation
capacitor, C6 is required. It is required if the
ESR zero of the output capacitor happens at
less than four times the crossover frequency.
Or:
where R
of the output capacitor.
If this is the case, then add the second
compensation resistor. Determine the value
by the equation:
Where R
output capacitor.
Figure 3: MP1583 with Murata 22µF, 10V Ceramic Output Capacitor
Figure 4: MP1583 with Panasonic 47µF, 6.3V Special Polymer Output Capacitor
MP1583 Rev 2.0_06/30/04
Monolithic Power Systems
4.75 to 23V
4.75 to 23V
NOT USED
NOT USED
INPUT
INPUT
OPEN
OPEN
10µF/35V
10µF/50V
ESR
ESR(MAX)
C1
C1
C6 = C
is the equivalent series resistance
8π*C
EN
SS
EN
SS
is the maximum ESR of the
IN
IN
OUT
OUT
MP1583
MP1583
GND
GND
*R
100pF
*R
100pF
C6
C6
ESR(max)
ESR
COMP
COMP
BS
*f
BS
R3
4.99K
C
C3
10nF
C3
10nF
R3
10K
SW
SW
FB
FB
≥ 1
10nF
/ R3
10nF
C5
C5
D1
D1
10K
10.5K
R2
10.5K
15µH
R2
10K
15µH
R1
L1
R1
L1
www.monolithicpower.com
C2
22µF/10V
Ceramic
C2
47µF/6.3V
Panasonic SP
OUTPUT
2.5V/3A
OUTPUT
2.5V/3A
Example:
V
C
R3 ≈ 6.8x10
nearest standard value of 7.5KΩ.
C3 ≈ 1.59x10
nearest standard value of 2.2nF.
2π C
therefore no second compensation capacitor is
required.
OUT
OUT
OUT
= 5V
= 22µF Ceramic (ESR = 10mΩ)
R
ESR
7
-5
(22x10
f
C
/ 7.5KΩ = 2.12nF. Use the
Step Down Converter
= .055 which is less than 1,
-6
) (5) = 7480Ω. Use the
MP1583
3A, 23V
8