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SC2449 Datasheet

  • SC2449

  • BI PHASE DUAL CONTROLLER

  • 20頁

  • SEMTECH   SEMTECH

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BI-Phase/Dual Controller
POWER MANAGEMENT
Description
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.
Capable of driving MOS.ETs via external driver transis-
tors for phase currents beyond 20A.
SC2449
.eatures
K
K
K
K
K
K
K
K
K
K
Selectable dual output or bi-phase operation
Direct drive for N-channel MOS.ETs
Undervoltage lockout
Synchronization to external clock
Multi-converter synchronization
Soft start
.ast transient response
Max duty cycle 45%
Output over voltage protection
Thermal shutdown
Applications
K
Power supplies for advanced telecoms/datacoms
K
SO IP, Ethernet and PABX power supplies
Typical Application Circuit
Revision 4, May 2002
1
www.semtech.com

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