MP1583 MPS, MP1583 Datasheet - Page 8

• Manufacturer Part Number: MP1583
• Description: Step Down Converter
• Manufacturer: MPS

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