Rainbow Electronics MAX17409 - Manual (Page 13)

MAX17409
1-Phase Quick-PWM GPU Controller
______________________________________________________________________________________ 13
OUTPUT
SENSE
GROUND
SENSE
PWRGD
G0
G1
G2
G3
G4
VID INPUTS
SHDN ON OFF
REF
GNDS/OFSP
V
REF
3.3V
(VRON)
CORE
OUTPUT
INPUT
7V TO 24V
L1
5V BIAS
INPUT
LX
DH
DL
BST
PGND
CSP
CSN
IMON
AGND
TON
FB VRHOT
V CC
C1
1.0 µF
AGND
PWR
PWR
R TON
R BST
0 Ω
C
BST
0.1 µF
C
IN
N HI
R10
R11
C7
R FB
C8
1000pF
R
GND
0 Ω
R13
10 Ω
R16
10
Ω
R15
10
Ω
R14
10 Ω
R1
10 Ω
C2
1.0
µF
SWITCHING FREQUENCY (f SW = 1/t SW ):
t SW = 16.3pF x (R TON + 6.5k Ω)
VALLEY CURRENT LIMIT SET BY THE TIME TO ILIM
V LIMIT = 0.2V x R2/(R2 + R3)
SLEW RATE SET BY TIME BIAS CURRENT
dV/dt = 12.5mV/ µs x 71.5kΩ/(R2 + R3)
LOAD LINE ADJUSTMENT:
R
FB
= R
DROOP
/(R
SENSE
x 600 µS)
V DD
R IMON
ILIM
R3 R2
R4
10k Ω
GND (EP)
G5
D1
11
12
13
14
15
16
10
25
26
9
24
1
3
2
4
5
23
17
18
21
22
20
8
19
27
N LO
NTC1
DCR THERMAL COMPENSATION
REMOTE-SENSE FILTERS
CATCH RESISTORS
REQUIRED WHEN
CPU NOT POPULATED
C OUT
R5
10k Ω
R8
10k Ω
MAX17409
PWR
PWR
PWR
SKIP
6
C5
OPEN
AGND
AGND
C
REF
100pF
C6
OPEN
C3
R20
OPEN
AGND
C CCV
100pF
CCV
28
AGND
AGND
AGND
AGND
PWR
C9
1000pF
V REF
THRM V
CC
NTC2
100k Ω
B = 4700
7
R6
7.87k Ω
AGND
C4
0.1 µF
AGND
Figure 1. MAX17409 Application Circuit