XR79203 Datasheet, PDF (14/19 Pages) Exar Corporation – 40V, 3A Synchronous Step-Down

Applications Information (Continued)
XR79203
D2
MMSZ4685-TP
RZ
VIN
10k, 1%
R1
30.1k, 1%
2 - 3 = DCM/CCM
3
J1
2
1
1 - 2 = CCM
C1
0.22µF
R2
35.7k, 1%
CSS
47nF
PGOOD
RPGOOD
VCC
10k
RON
21.5k
SW
RLIM
1.8k
FB
VIN
VCC
CIN
0.1µF
CVCC
4.7µF
1
2
3
SS
PGOOD
FB
4
5
AGND
AGND
6
7
8
VIN
VCC
PGND
9
10
11
12
SW
SW
SW
SW
13 _PGND
BST
AGND
SW
PGND
PVIN
VOUT
PGND
PGND
PGND
41
40
39
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
38
37
36
35
34
33
32
31
30
29
SW
XR79203
VIN = 24V Nominal
VIN
0.1µF 10µF
10µF
500kHz, 3.3V, 3A
VOUT
0.1µF 47µF
0.1µF
CFF
220pF
RFF
0.18k
RFB1
9.09k, 1%
FB
RFB2
2k, 1%
Figure 27. Typical Application Circuit
REV1B
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