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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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SC2422ACSTR Fiches technique(PDF) 1 Page - Semtech Corporation |
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SC2422ACSTR Fiches technique(HTML) 1 Page - Semtech Corporation |
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1 / 10 page  SC2422A BIPHASE CURRENT MODE CONTROLLER © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 PRELIMINARY - August 7, 2000 1 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DEVICE (1) PACKAGE TEMP. RANGE (T J) SC2422ACS.TR SO-16 0 - 125°C SC2422A.EVB Evaluation Board ORDERING INFORMATION Note: (1) Only available in tape and reel packaging. A reel con- tains 1000 devices. FEATURES • Precision, pulse by pulse phase current match- ing • Active drooping allows for best transient response • Input Sensing Current mode control • Programmable DAC step size/offset allows Compliance with VRM9.0, VRM8.3 or VRM8.4 • Externally programmable soft-start • 5V or 12V input for next generation processors • 0% minimum duty cycle improves transient re- sponse • Externally Programmable UVLO with hysteresis • Cycle by cycle current limiting • Programmable Internal Oscillator to 1 MHz • VID IIIII Inhibit (No CPU) APPLICATIONS • Intel Advanced Microprocessors • AMD AthlonTM power supplies • Servers/Workstations, high density power supplies TYPICAL APPLICATION SCHEMATIC DESCRIPTION The SC2422A biphase, current mode controller is de- signed to work with Semtech smart synchronous drivers, such as the SC1205, SC1305 or the SC1405 to provide the DC/DC converter solution for the most demanding Micro-processor applications. Input current rather than output current sensing is used to guarantee precision phase to phase current matching using a single sense resistor on the input power line. Accurate current sharing and pulse by pulse current limit are implemented without the power loss and transient re- sponse degradation associated with output current sense methods. Two phase operation allows significant reduction in input/output ripple while enhancing tran- sient response. The DAC step size and range are programmable with external components thus allowing compliance with new and emerging VID ranges. A novel approach implements active droop, minimizing output capacitor requirements during load transients. This avoids the pitfalls of the passive droop implemen- tation. This feature also allows easy implementation of N+1 redundancy and current sharing among modules. Programmable Under Voltage Lockout assures proper start-up and shutdown by synchronizing the controller to the driver supply. Wide PWM frequency range allows use of low profile, surface mount components. VIN INPUT Vout VIN Rf Rref Ri SC1305 4 7 6 1 3 5 VDD DRVH PHASE IN VCC DRVL SC1305 4 7 6 1 3 5 VDD DRVH PHASE IN VCC DRVL Rsens SC2422A 12 9 2 3 1 13 7 5 6 11 14 4 10 15 16 8 OUT2 GND VID3 VID2 VID4 OUT1 FB VID0 ERROUT OC- OC+ VID1 UVLO BGOUT VCC RREF |
Numéro de pièce similaire - SC2422ACSTR |
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Description similaire - SC2422ACSTR |
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