sc2449iswtrt Semtech Corporation, sc2449iswtrt Datasheet
sc2449iswtrt
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sc2449iswtrt Summary of contents
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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 ...
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POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied ...
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POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified V = 24V 25° ...
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POWER MANAGEMENT Pin Configuration Top View (28-Pin SOIC) Block Diagram 2007 Semtech Corp. Ordering Information ...
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POWER MANAGEMENT Pin Descriptions ...
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POWER MANAGEMENT Typical Application Schematic for Two Channel Operation 2007 Semtech Corp. 6 SC2449 www.semtech.com ...
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POWER MANAGEMENT Typical Application (Cont.) Bill of Material for Two Channel Operation ...
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POWER MANAGEMENT Typical Application (Cont.) Bill of Material for Two Channel Operation (Cont ...
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POWER MANAGEMENT Typical Application (Cont.) Schematic for Bi-Phase Operation 2007 Semtech Corp. 9 SC2449 www.semtech.com ...
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POWER MANAGEMENT Electrical Characteristic Curves Two Channel Operation Efficiency in Two-Channel Application Circuit (5V/12A, 3.3V/18A) 95.00% 90.00% 85.00% 80.00% 75.00% 70.00% 65.00% 60.00% 0 Phase Node Waveform of Two-Channel Application Circuit (Vin = 24V, Load Current = 12A for 5V, ...
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POWER MANAGEMENT Electrical Characteristic Curves (Cont.) 3.3V Channel Gate Waveform (Vin = 24V, Load Current = 18A) 5.0V Channel Gate Waveform (Vin = 24V, Load Current = 12A) 2007 Semtech Corp. ch1: VgateH; ch2: VgateL ch1: VgateH; ch2: VgateL 11 ...
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POWER MANAGEMENT Electrical Characteristic Curves (Cont.) Start-up (Vin = 24V, Vout1 = 5.0V/12A, Vout2 = 3.3V /18A) Bi-Phase Operation (Vout = 3.3V, Max. Load Current = 20A) Efficiency in Bi-Phase Application Circuit (3.3V/20A) 90.00% 85.00% 80.00% 75.00% 70.00% 65.00% 60.00% ...
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POWER MANAGEMENT Electrical Characteristic Curves (Cont.) Phase Node Waveform (Vin = 24V, Vout = 3.3V, Load Current = 20A) Gate Waveform (Vin = 24V, Vout = 3.3V, Load Current = 10A/phase) 2007 Semtech Corp. ch1: Vphase1; ch2: Vphase2 ch1: VgateL; ...
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POWER MANAGEMENT Electrical Characteristic Curves (Cont.) Start-up (Vin = 24V, Vout = 3.3V, Load Current = 5A/phase) Theory of Operation The SC2449 employs a voltage mode control with feed forward to provide fast output response to load and line transients. ...
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POWER MANAGEMENT Theory of Operation (Cont.) The switching frequency of each channel is one half of the oscillator frequency. The oscillator clock is also avail- able externally through the CLKOUT pin and can be used to provide synchronization for other ...
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POWER MANAGEMENT Control Loop Design Gpwm Error-Amp Verror Duty - + R + Vbg Fig. 1. SC2449 control model. The control model of SC2449 can be depicted in Fig. 1. This model can ...
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POWER MANAGEMENT Control Loop Design (Cont pwm error F esr when F esr x_over (5) The compensation capacitor is determined by choos- ing the compensator zero to ...
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POWER MANAGEMENT Control Loop Design (Cont ase Layout Guidelines Good layout is necessary for successful implementa- tion of the SC2449 bi-phase/dual controller. Important layout guidelines are listed below. 1). The ...
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POWER MANAGEMENT Layout Guidelines (Cont.) 2007 Semtech Corp. Component Side (TOP) Copper (TOP) 19 SC2449 www.semtech.com ...
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POWER MANAGEMENT Layout Guidelines (Cont 2007 Semtech Corp Copper (BOTTOM) 20 SC2449 www.semtech.com ...
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... bxN A1 bbb C A-B D GAGE PLANE 0.25 A SEE DETAIL SIDE VIEW - DETERMINED AT DATUM PLANE - Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 21 SC2449 DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX - - A .093 .104 2.35 2.65 ...