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參數(shù)資料
| 型號： | SC420 |
| 廠商： | Semtech Corporation |
| 英文描述： | High Speed, Combi-SenseTM, Synchronous Power MOSFET Driver for Mobile Applications |
| 中文描述： | 高速，雜木SenseTM，同步功率MOSFET驅(qū)動器為移動應(yīng)用 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 273K |
| 代理商： | SC420 |
9
2003 Semtech Corp.
POWER MANAGEMENT
Applications Information (Cont.)
SC420
United States Patent No. 6,441,597
www.semtech.com
Start-up Sequencing
Proper sequencing of the Combi-Sense
TM
Controller and
SC420 driver during both start-up and shut-down is very
important. In general, the design must ensure that the
driver powers up (during start-up) before the controller
does, and that the driver powers down last during shut-
down. This ensures that the driver will never puts out
gate drive pulses which are not well-controlled, a situation
that can lead to MOSFET damage.
In general it is recommended that the Vcc’s for the Combi-
Sense
TM
Controller and SC420 be connected to the same
(5V) supply. If the EN controls are not used (tied high)
then the UVLO settings for the controller and driver will
guarantee the proper sequencing (the SC420 maximum
UVLO value is guaranteed to be lower than the Combi-
Sense
TM
Controller minimum UVLO value).
For absolute guarantee of proper sequencing it is rec-
ommended that the EN controls be used as shown in
the following block diagram. With this arrangement the
delayed PWRGD signal from the VccVID regulator is
used to enable both ICs. The Soft-Start time established
for the controller ensures it will come up well after the
SC420. During power-down de-assertion of
VID_PWRGD will ensure simultaneous disabling of the
Combi-Sense
TM
Controller and SC420.
VccVID Regulator
SYS_PWRGD
VR_ON
V
3
SC1403
VID_PWRGD
CO
V
5
SC400
EN
SC420
EN
V
cc
-CORE
VccPWRGD
Detailed information on manufacturing and rework
of PCBs using the MLP package can be found in
the MLP application note “Comprehensive User’s
Guide - Micro Lead Frame Package” dated April
2002. Please contact your local Semtech
representative to obtain a copy of this application
note.
Manufacturing Guidelines
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