MP1583 查看數據表（PDF） - Monolithic Power Systems
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MP1583 Datasheet PDF : 11 Pages
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Monolithic Power Systems
MP1583
3A, 23V
Step Down Converter
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:
8π*COUT*RESR*fC ≥ 1
where RESR is the equivalent series resistance
of the output capacitor.
Example:
VOUT = 5V
COUT = 22µF Ceramic (ESR = 10mΩ)
R3 ≈ 6.8x107 (22x10-6) (5) = 7480Ω. Use the
nearest standard value of 7.5KΩ.
C3 ≈ 1.59x10-5 / 7.5KΩ = 2.12nF. Use the
nearest standard value of 2.2nF.
If this is the case, then add the second
compensation resistor. Determine the value
by the equation:
2π COUT RESR fC = .055 which is less than 1,
therefore no second compensation capacitor is
required.
C6 = COUT*RESR(max) / R3
Where RESR(MAX) is the maximum ESR of the
output capacitor.
Figure 3: MP1583 with Murata 22µF, 10V Ceramic Output Capacitor
INPUT
4.75 to 23V
C1
10µF/35V
OPEN
NOT USED
C5
10nF
IN
BS
SW
EN MP1583
SS
GND
FB
COMP
C6
100pF
C3
10nF
R3
10K
L1
15µH
D1
R1
10.5K
R2
10K
OUTPUT
2.5V/3A
C2
22µF/10V
Ceramic
Figure 4: MP1583 with Panasonic 47µF, 6.3V Special Polymer Output Capacitor
INPUT
4.75 to 23V
C1
10µF/50V
OPEN
NOT USED
C5
10nF
IN
BS
SW
EN MP1583
SS
GND
FB
COMP
C6
100pF
C3
10nF
R3
4.99K
L1
15µH
D1
R1
10.5K
R2
10K
OUTPUT
2.5V/3A
C2
47µF/6.3V
Panasonic SP
MP1583 Rev 2.0_06/30/04
www.monolithicpower.com
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