MAX15041EVKIT+ Maxim Integrated Products, MAX15041EVKIT+ Datasheet - Page 13

• Manufacturer Part Number: MAX15041EVKIT+
• Description: KIT EVAL MAX15041ETE
• Manufacturer: Maxim Integrated Products
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of MAX15041EVKIT+

• Board Size: 55 mm x 55 mm
• Operating Supply Voltage: 4.5 V to 28 V
• Product: Power Management Development Tools
• Dimensions: 55 mm x 55 mm
• Silicon Manufacturer: Maxim
• Silicon Core Number: MAX15041
• Kit Application Type: Power Management
• Application Sub Type: Synchronous Buck Converter
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: MAX15041

Figure 1. Peak Current-Mode Regulator Transfer Model
Having defined the power modulator’s transfer function
gain, the total system loop gain can be written as fol-
lows (see Figure 1):
where R
gain, A
ductance, g
much larger than C
Rewriting:
Step-Down DC-DC Regulator with Internal Switches
Gain
FEEDBACK
R
R
DIVIDER
1
2
V
OUT
s C
VEA
V
G
C
OUT
V
OUT
MOD LOAD
FB
REF
G
, divided by the error amplifier’s transcon-
C
Low-Cost, 3A, 4.5V to 28V Input, 350kHz, PWM
FB
MV
MOD
CC
is the quotient of the error amplifier’s DC
A
R
; R
Gain
VEA
g
MV
R
C
OUT
______________________________________________________________________________________
R
CC
LOAD
ERROR AMPLIFIER
*C
R
R
R
OUT
CC
.
1
sC
is much larger than R
R
OUT
R
OUT
s s C
IS OPTIONAL.
2
C
= A
R
OUT
R
sC
2
1
OUT
VEA
A
sC R
g
sC
OUT
VEA
MV
/g
R
A
C C
ESR R
MV
sC
s C
OUT
OUT
VEA
sC R
ESR R
O
C C
U U T
R
C C
ESR
C
C
1
||
C
1 1
ESR
COMP
C
LOAD
CC
LOAD
*C
1
1
sC
1
R
CC
C
CC C
C
||
1
R
and C
1
R
NOTE: THE G
THE INDUCTOR INJECTED INTO THE OUTPUT LOAD. THIS REPRESENTS A
SIMPLIFICATION FOR THE POWER MODULATOR STAGE DRAWN ABOVE.
OUT
COMPARATOR
1
C
PWM
1
is
MOD
STAGE SHOWN ABOVE MODELS THE AVERAGE CURRENT OF
COMPENSATION
The dominate poles and zeros of the transfer loop gain
is shown below:
The order of pole-zero occurrence is:
Note under heavy load, f
A graphical representation of the asymptotic system
closed-loop response, including the dominant pole and
zero locations is shown in Figure 2.
g
MC
CONTROL
f
f
f
P
P
Z
RAMP
LOGIC
V
1
3
2
COMP
POWER MODULATOR
2
2
2 2
G
MOD
10
C
C
1
CC C
OUT
A
1
VEA
R
g
ESR
V
MV
V
f
IN
P
dB
I
OUT
L
Q
Q
1
HS
LS
f
/
Z
20
1
f
P
L0
2
2
C
P2
C
f
Z
, may approach f
C R
1
1
f
C C
P
DCR
2
I
L
f
Z
2
2
f
P
C
3
C
OUT
ESR
OUT
OUTPUT FILTER
AND LOAD
ESR
1
Z1
.
V
OUT
R
R
LOAD
LOAD
13