sc2434 Semtech Corporation, sc2434 Datasheet
sc2434
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sc2434 Summary of contents
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... POWER MANAGEMENT Description The SC2434, a tri-phase, current mode controller is designed to work with Semtech smart synchronous drivers, such as the SC1205, SC1206, and SC1207 to provide the DC/DC converter solution for the most demanding Microprocessor applications. Input current sensing is used to guarantee precision phase to phase current matching using a single sense resistor on the input power line ...
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... < µ < µ SC2434 PRELIMINARY ° ° ° ° ° ...
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... SC2434 www.semtech.com V ...
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... The compensation network allows optimization of the control-loop for system stability and fast transient responses. SC2434 Fig.1 - The simplified voltage regulator based on SC2434. 2005 Semtech Corp. Flexible VID The VID circuitry reads the 5 bit digital command and converts it into a current flowing into the inverting input pin of the error amplifier ...
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... Power Good SC2434 features a power good input and an open collec- tor power good output. The VR output voltage is scaled down through a resistive divider and this signal is fed into PGIN (power good input) pin. The scaled VR output volt- age has to be bigger than 0 ...
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... VID step size can be accommodated by modifying external components while maintaining the required precision. Choose Current Sensing Resistor According To The Threshold Of OCP The SC2434 controller has an over current protection (OCP) threshold of 120mV. The normal practice is to let the peak voltage across the sensing resistor corresponding to 2005 Semtech Corp. ...
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... Control Loop Compensation The current mode control yields a power supply easy to compensate because the power stage has first order (single pole) behavior. The SC2434 provides internal slope compensation to avoid sub harmonic oscillation of the current loop. The added ramp signal has 300mV peak-to- peak amplitude and the ramp frequency is as same as the oscillator frequency ...
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... ω ω phase_Loop phase_Loop ( ( Fig Loop gain Bode plot based on control loop model. Fig Measured loop gain Bode plots. 10 SC2434 PRELIMINARY Loop-Gain (dB) Loop-Gain (dB) Loop-Gain (dB ...
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... Use a pair of closely paralleled traces to pick up the sensing voltage across the sensing resistor. The sensing traces server as differential input to the OC+ and OC- pins of the SC2434 controller. These traces should run on a routing layer (e.g., bottom layer for 4 layer PCB case) to avoid picking up strong AC magnetic field due to power current flow. ...
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... Brief specifications of this design are listed below: V =12V in V =1.725V +/- 25mV at 0A load out V droop slope is 1.5 mOhm out V tolerance is +/-25mV for all load conditions out I = 60A max out VID [4:0] = 00100 The schematic is shown on the cover page of this data sheet. 2005 Semtech Corp. 12 SC2434 PRELIMINARY www.semtech.com ...
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... FET, while the top FET has 12 mOhm Rdson. 95.00 90.00 85.00 80.00 75.00 70.00 65.00 0 Fig Typical efficiency curve for 12 mOhm top FETs and 4 Ohm bottom FETs. 2005 Semtech Corp. n Load Line (Vin=12V, VID=00100 (A) Efficency (%) I_out(A) 15 SC2434 Vo Spec_H Spec_L www.semtech.com ...
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... The typical gate waveform for the top and bottom MOSFETs is also shown here, well-controlled dead time is demonstrated which ensures high efficiency operation of the VR. Fig The typical gate waveform for the top and bottom MOSFETs. 2005 Semtech Corp. Ch2: HS Gate Ch3: Phase Node Ch4: LS Gate 16 SC2434 PRELIMINARY www.semtech.com ...
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... Fig Transient response and the test condition: Step Load from 10A to 60A Output Capacitors: 14 units of 560uF OSCON caps, 38 units of 10uF ceramic caps Ch1: Output Voltage Ch4: Output Current (1A = 27.5mV di/dt = 370A/uS) Meet Intel P-4 spec 2005 Semtech Corp. Output Voltage Load Current 17 SC2434 www.semtech.com ...
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... NOM MAX MIN NOM MAX - - - .047 1. .006 0.05 0. .042 0.80 1. .012 0.19 0. .007 0.09 0.20 .255 .259 6.40 6.50 6.60 .173 .177 4.30 4.40 4.50 6.40 BSC 0.65 BSC .024 .030 0.45 0.60 0.75 (.039) (1. 8° 0° 8° .004 0.10 .004 0.10 .008 0. (L1) A DETAIL DIMENSIONS INCHES MILLIMETERS (.222) (5.65) .161 4.10 .026 0.65 .016 0.40 .061 1.55 .283 7.20 SC2434 www.semtech.com ...
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... BSC 10.30 BSC .050 BSC 1.27 BSC .010 - .030 0. .016 .041 0.40 1.04 (.041) (1.04 0° - 8° 0° - 8° .004 0.10 .010 0.25 .013 0. (L1) A DETAIL DIMENSIONS INCHES MILLIMETERS (.362) (9.20 .276 7.00 P .050 1.27 X .024 0.60 Y .087 2.20 Z .449 11.40 SC2434 www.semtech.com ...