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SC4808B-1MSTRT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
222006 Semtech Corp. www.semtech.com
SC4808B-1
POWER MANAGEMENT
Gain & Phase Margin (Cont.)
Typical SC4808B-1 Push Pull Converter Gain/Phase plot at Vin = 72V, Vout = 3.3V, Iout = 10A, Fosc = 650kHz
-30
-20
-10
0
10
20
30
40
50
10 100 1000 10000 100000
Freq (Hz)
Gain (dB)
-225
-180
-135
-90
-45
0
45
90
135
180
225
Phase (deg)
Gain
Phase (deg)
Gain
Phase
232006 Semtech Corp. www.semtech.com
SC4808B-1
POWER MANAGEMENT
Typical Step Load
Typical SC4808B-1 Push Pull Converter Step Load plot at Vin = 48V, Vout = 3.3V, Step = 37% to 75% Iout, Fosc = 650kHz
Cout = 6X22uF (132uF) Ceramic
Iout
5A/Div
Vout
500mV/Div
100us/Div
242006 Semtech Corp. www.semtech.com
SC4808B-1
POWER MANAGEMENT
Evaluation Board Schematics
Sync Drive Supply
1u,16V
C20
.1u,16V
C14
M2
SUD19N20-90
3
2
1
R4
250
Q1
FZT853
E
B
C
C30
1nF
R3116.2
Murata GRM32DR60J226KA01
D2
MBRB2535CTL
1
3
4
R29
100
CON2
3input_half_brick
1
2
4
V
in+
ON/OFF
Vin-
D3
1N5819HW
AC
R19
0
C34
.1uF
For output power > 30W, adequate air flow should be provided to avoid over dissipation.
SC4808EVB__non_sync 1.1
SC4808 Push Pull 3.3V 50W non Synchronous
11Monday, October 07, 2002
Title
Size Document Number Rev
Date: Sheet of
SEMTECH CORPORATION
D14
CMOSH-3
R27
15k
VCC = 15V
1u,100V
C11
D6
1N5819HW
D13
CMOSH-3
C24
0.1u
R3
20k
R12
56.2k
22u,6.3V
C6
0.1u,25V
C23
G_B
N = 100
T2
P8208T
8 7
1 3
G_A
M1
SUD19N20-90
3
2
1
R23
18.2k
1u,100V
C12
GRM55DR72E105KW01
R22
37.4k
R30
15k
D8
LS4448
D11
CMOSH-3
J2
0.1u
C10
0
J3
C26
0.1u
R26
2.2k
VCC
R2110k
J1
T3
PE-68386
1
3
6
4
R25
11.5k
R24
1k
C32.2n
R32
56.2k
0.1u
C2
R8
0
VCC
2.2u,16V
C19
D15
CMOSH-3
R18
10
D12
CMOSH-3
Sync Drive Supply
R510
D1
MBRB2535CTL
1
3
4
C35
2.2uF 16V
Vref
U5
SC4431
1
2
4
5
D4
ZM4743A
22u,6.3V
C7
D16
1N5819HW
A
C
REF
REF
U3
SC1301A
1 4
3
2
5
R17
15k
R6
TBD
U1
SC4808
4
5
3
2
101
6
7
8
9
FB
REF
CS
RC
LUVLOSYNC
GND
OUTB
OUTA
VCC
D7
CMOSH-3
D9
CMOSH-3
U2
SC1301A
1 4
3
2
5
22u,6.3V
C9
R7
0
C32
0.1u
R13 10k
82p
C22
U7
CBRHD-02
1 2
34
C12.2n
R1
0
R9
2.2
JP1
SYNC
G_B
C28
NA
Vref
U4
SC4431
1
2
4
5
L2
LQH43MN102K011
1 2
22u,6.3V
C4
R15
0
R20
2.2k
Sync Drive Supply
R11
TBD
R16
1k
R10
2.2
R28
25.5k
Q2
FMMT718
22u,6.3V
C8
VCC
D10
CMOSH-3
10u,16V
C15
GRM32DR61C106KA01
82p
C21
C2510nF
22nF
C18
R210
U6
MOCD207
1
2
8
7
3
4
6
5
10u,16V
C16
GRM32DR61C106KA01
C17
0.1u
G_A
VCC
VCC
C29100pF
22u,6.3V
C5
D5
1N5819HW
CON1
5output_half_brick
5
6
7
8
9
Vout-
Sense-
Trim
Sense+
Vout+
C27
22n
C31
470pF
C33
22n
6T 1T
4T
T1
PA0500
2
5
3
4
10
9
8
1
6
R14 15
1u,100V
C13
GRM55DR72E105KW01
Note:
L1
0.9uH
1 2
0
REF
6T 1T
PG0006.102T
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

SC4808B-1MSTRT

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Buy SC4808B-1MSTRT
Manufacturer:
Semtech
Description:
IC REG CTRLR MULT TOP 10MSOP
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