SC4612 查看數據表（PDF） - Semtech Corporation
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SC4612 Datasheet PDF : 24 Pages
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POWER MANAGEMENT
Application Information (Cont.)
Application Circuit 1: Vin = 36V; Vout = 5V @ 20A, Fsw = 250kHz.
SC4612
R1
560k
U1
S C4612M LP
1
ILIM
C2
430 p
2
OSC
PHASE
12
DH
11
C4
9.1n
C3
0. 1 3
R3
10k 4
SS/E N
EAO
BST
10
DRV
9
R 4*
C5
1.3n
5
FB
6
VDD
DL
8
GND
7
Z1*
C6
1_cer
R6
48.7 k
D1
MB R0 540
Q1
HAT 2172H
Q2
HAT 2172H
C8
2.2/ 10V
C9
10/50V_cer
R5
5.36 k
C7
R7
1.3n
910
Fsw =250k Hz
R4*: if Vin > 28V, then R4 & Z1 provide VDD clamping
C14 A
330/ 50V_AL
C14B
330/ 50V_AL
+
Vin=36V
_
C10
0. 1
L1
4.7u H@ 22 A
+
C12 A
C12B
C13 A
C13B
330 /6.3V 330 /6.3V 330 /6.3V 10/6.3V_cer
Vou t=5@20A
_
Efficiency:
SC4612: 36Vin, 5Vout @ 20A
100%
98%
96%
94%
92%
90%
88%
86%
84%
82%
80%
0 2 4 6 8 10 12 14 16 18 20 22
Current, (A)
2007 Semtech Corp.
17
www.semtech.com
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