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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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SC1146CSW Fiches technique(PDF) 1 Page - Semtech Corporation |
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SC1146CSW Fiches technique(HTML) 1 Page - Semtech Corporation |
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1 / 10 page  VRM9.0 PROGRAMMABLE, MULTI-PHASE, HIGH PERFORMANCE PWM CONTROLLER SC1146 © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 July 25, 2000 1 The SC1146 is patent pending Pentium is a registered trademark of Intel Corporation BLOCK DIAGRAM FEATURES •= Allows use of small surface mount components •= Ultra fast transient recovery time •= Dramatic reduction of input ripple current and out- put ripple voltage •= 5-bit programmable DAC for the latest, lower output voltage Microprocessors •= Wide, High frequency operating range •= Selectable 2, 3, 4 phase operation •= +5 Volt only operation eliminates the need for +12V supply •= Precision load current sharing,1%PWM match •= Selectable internal or external clock •= Soft start/UVLO/Over current protection APPLICATIONS •= High end servers and workstations •= High current/Ultra-fast transient microprocessors TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DEVICE (1) PACKAGE TEMP. (T J) SC1146CSW.TR SO-24 0 - 85°C ORDERING INFORMATION Note: (1) Only available in tape and reel packaging. A reel contains 1000 devices. DESCRIPTION The SC1146 is the latest, high performance, multi- phase (PWM) controller designed for high power mi- croprocessors requiring ultra fast transient response. The SC1146 is programmable for the voltage range required by the latest Microprocessors . Utilizing a novel and unique design, the controller distributes the output load across (up to) four converter channels by digitally phase shifting the PWM outputs. This ap- proach greatly reduces the stress and heat on the out- put stage components while lowering input ripple cur- rent by as much as 80%. Accurate current sharing among the four phases is achieved by precision design techniques and trimming of critical elements. The high speed transconductance error amplifier is ex- ternally initialized using a soft-start capacitor allowing the controller to “wake-up” without overshoot, thus pro- tecting the low voltage microprocessor loads. The out- put drive voltage to the power MOSFETs is pro- grammable to minimize switching losses in the drive circuitry. The output voltage is digitally programmable by means of a 5 bit DAC (new codes). A single resistor programs the master clock frequency (8MHz max) or the clock can be supplied by an external source where exact fre- quency control is desired. The number of operating phases is programmed independently of the external clock. The parts features under-voltage lock-out with hysteresis and over-current protection. PIN CONFIGURATION Top View (24-Pin SOIC) |
Numéro de pièce similaire - SC1146CSW |
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Description similaire - SC1146CSW |
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