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부품번호 | SC2449 기능 |
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기능 | BI PHASE DUAL CONTROLLER | ||
제조업체 | Semtech Corporation | ||
로고 | |||
전체 20 페이지수
SC2449
BI-Phase/Dual Controller
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POWER MANAGEMENT
Description
.eatures
The SC2449 can be configured as a dual converter or a
bi-phase converter for high current applications. The part
is designed for point of use power supplies with 8.5-28V
nominal backplane power sources. Multiple supplies can
be synchronized together to prevent low frequency har-
monics on the backplane. The power dissipation is con-
trolled using a novel low voltage supply technique, allow-
ing high speed and integration, with the high drive cur-
rents to ensure low MOS.ET switching loss.
The use of high speed switching circuits allows very nar-
row PWM outputs down to 15:1 voltage ratios. Single
pin compensation for each channel simplifies develop-
ment as well as reducing external pin count.
K Selectable dual output or bi-phase operation
K Direct drive for N-channel MOS.ETs
K Undervoltage lockout
K Synchronization to external clock
K Multi-converter synchronization
K Soft start
K .ast transient response
K Max duty cycle 45%
K Output over voltage protection
K Thermal shutdown
Applications
Capable of driving MOS.ETs via external driver transis- K Power supplies for advanced telecoms/datacoms
tors for phase currents beyond 20A.
K SO IP, Ethernet and PABX power supplies
Typical Application Circuit
Revision 4, May 2002
1
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POWER MANAGEMENT
Pin Configuration
Top View
SC2449
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Ordering Information
Part Number(1)
SC2449ISWTR
SC2449EVB
PACKAGE
SO-28
Evaluation Board
T (T )
AMB A
-40 - +85°C
Note:
(1) Only available in tape and reel packaging. A reel con-
tains 1000 devices.
(28-Pin SOIC)
Block Diagram
2002 Semtech Corp.
4
www.semtech.com
4페이지 SC2449
POWER MANAGEMENT
Typical Application (Cont.)
Bill of Material for Two Channel Operation
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Item Qty Reference
Part Number/Value
Manufacturer
1 8 C1 - C8
0.47µF, 50V, Cer.
Any
2 3 C9,C24,C25
0.33µF, Cer., 1206
Any
3 2 C10,C11
22nF, Cer., 1206
Any
4 1 C12
0.1µF, Cer., 1206
Any
5 2 C13,C14
100pF, Cer., 1206
Any
6 1 C15
47pF, Cer., 1206
Any
7 6 C16,C19,C20,C21,C22,C23
22µF, 35V, Tant.
Any
8 2 C17,C18
680µF, 35V, Alum.
Any
9 2 C26,C27
2.2nF, Cer., 1206
Any
10 3 C28,C29,C50
1.0nF, Cer., 1206
Any
11 1 C30
1.0µF, Cer., 1206
Any
12 11 C31,C32,C33,C36,C37,C40,C41,C42,C43,C44,C45 10µF, Cer., 1206
Any
13 4 C34,C35,C38,C39
1500µF, 6.3V, Alum.
Any
14 4 D1,D2,D5,D6
1A, 40V, Schottky, MELF,
1N5819M
Any
15 2 D3,D4
3A, 40V, Schottky, 30BQ040 Any
16 2 L1,L2
Inductor, 9 turns
Magnetics:
Kool Mu
P/N: 77206-A7
17 4 M1,M2,M3,M4
N-Channel MOSFET, TO-
263AB
Fairchild
P/N: FDB7030BL
18 1 Q1
80V, 1A, NPN, Med. Pwr.
SOT-223
BCP56CT
19 2 R1,R3
2.2, 5%, 1206
Any
20 2 R4,R6
4.7, 5%, 1206
Any
21 4 R2,R5,R7,R11
1.0, 5%, 1206
Any
22 1 R8
56k, 5%, 1206
Any
23 2 R9,R10
2.2k, 5%, 1206
Any
24 1 R12
Chip resistor,
0.005, 1W, 1%, 2512
Any
2002 Semtech Corp.
7
www.semtech.com
7페이지 | |||
구 성 | 총 20 페이지수 | ||
다운로드 | [ SC2449.PDF 데이터시트 ] |
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