Rainbow Electronics MAX1545 - Manual (Page 41)

MAX1519/MAX1545
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
______________________________________________________________________________________ 41
INPUT*
7V TO 24V
OUTPUT
V CC
POL
T ON
ILIM
FLOAT
(300kHz)
REF
(MASTER)
COMP OUTPUT
L3
C BST3
0.22 µF
N H3
N
L3
C IN
C6
0.22 µF
R12
10 Ω
R COMP1
20k Ω
C COMP1
270pF
R18
49.9k
Ω
R17
200k Ω
C9
100pF
R13
100 Ω
R14
100 Ω
R15
100 Ω
R16
100 Ω
C7
1000pF
C8
1000pF
5V BIAS
SUPPLY
C5
1
µF
DLM
(MASTER) CMP CMN
CONNECT TO
MAX1519/MAX1545
(SEE FIGURE 12a)
C OUT
POWER GROUND
ANALOG GROUND
(MASTER)
ANALOG GROUND
(SLAVE)
*LOWER INPUT VOLTAGES
REQUIRE ADDITIONAL
INPUT CAPACITANCE.
D BST3
CONNECT TO
MAX1519/MAX1545
(SEE FIGURE 12a)
DD
LIMIT
TRIG
SKIP
(MASTER)
R SENSE3
1.5m Ω
D1
1N4148
MAX1980
U2
BST
DH
LX
DL
PGND
GND
CS+
CS-
V+
CM+
CM-
V DD
Figure 12b. Standard 4-Phase Desktop 4 Application Circuit (3rd Phase—MAX1980 Slave)