Rainbow Electronics MAX1545 - Manual (Page 42)

MAX1519/MAX1545
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
42 ______________________________________________________________________________________
INPUT*
7V TO 24V
OUTPUT
V CC
POL
T ON
ILIM
FLOAT
(300kHz)
REF
(MASTER)
COMP OUTPUT
L4
C BST4
0.22 µF
N H4
N L4
C IN
C11
0.22 µF
R19
10 Ω
R
COMP2
20k Ω
C COMP2
270pF
R25
49.9k
Ω
R24
200k Ω
C14
100pF
R20
100 Ω
R21
100 Ω
R22
100 Ω
R23
100 Ω
C12
1000pF
C13
1000pF
5V BIAS
SUPPLY
C10
1
µF
DLS
(MASTER) CSP CSN
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 BST4
CONNECT TO
MAX1519/MAX1545
(SEE FIGURE 12a)
DD
LIMIT
TRIG
SKIP
(MASTER)
R SENSE4
1.5m Ω
D2
1N4148
MAX1980
U3
BST
DH
LX
DL
PGND
GND
CS+
CS-
V+
CM+
CM-
V DD
Figure 12c. Standard 4-Phase Desktop 4 Application Circuit (4th Phase—MAX1980 Slave)