Rainbow Electronics MAX799 - Manual (Page 30)

MAX796/MAX797/MAX799
Step-Down Controllers with
Synchronous Rectifier for CPU Power
30 ______________________________________________________________________________________
MAX797
CSL
CSH
FB
VL
SYNC
V+
Q1
Q2
1N4148
1N4148
D1
1N5819
T1
REF
GND
+5V OUTPUT
AT 3A
BST
DH
LX
DL
PGND
SKIP
SS
SHDN
INPUT
0.33 µ F
C1
2x 22
µ F 4.7 µ F
C2
220µ F
0.1 µ F
0.01 µ F
0.1 µ F
100k
1%
100k
1%
10 µ H
1.91 Ω , 1%
T1 = 1:70 5mm SURFACE-MOUNT TRANSFORMER
DALE LPE-3325-A087
Q1, Q2 = MMSF5N03 OR Si9410DY
Figure 20. Buck Converter with Low-Loss SMT Current-Sense Transformer
____________________________________________Application Circuits (continued)
MAX797
MAX495
CSL
CSH
VL
SYNC
FB
V+
N1
N2
D1
D2
1N5820
REF
GND
1.5V OUTPUT
AT 5A
DH
LX
DL
PGND
BST
SKIP
SS
ON/OFF SHDN
INPUT
4.75V
TO 5.5V
4.7 µ F
0.1 µ F
C6
0.01 µ F
C2
2 x 220 µ F
OS-CON
C3
0.1
µ F
C5
0.33 µ F
L1
3.3 µ H
C7
330pF
R1
12m Ω
R6
49.9k
R7
124k R5
150k
TO
VL R3
66.5k
1%
R4
100k
1%
C1
220
µ F
OS-CON
REMOTE SENSE LINE
N1 = N2 = MTD20N03HDL
L1 = COILCRAFT DO3316-332
Figure 21. 1.5V GTL Bus Termination Supply