UCC3817D UNITRODE, UCC3817D Datasheet
UCC3817D
Specifications of UCC3817D
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UCC3817D Summary of contents
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D Controls Boost Preregulator to Near-Unity Power Factor D Limits Line Distortion D World Wide Line Operation D Over-Voltage Protection D Accurate Power Limiting D Average Current Mode Control D Improved Noise Immunity D Improved Feed-Forward Line Regulation D Leading ...
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... AVAILABLE OPTIONS PACKAGE DEVICES SOIC (DW) PACKAGE PDIP (N) PACKAGE Turn-on Turn-on Turn-on Threshold Threshold Threshold UCC2817DW UCC2818DW UCC2817N UCC3817DW UCC3818DW UCC3817N THERMAL RESISTANCE TABLE θjc(°C/ (2) www.ti.com † 0 ...
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T = 0°C to 70°C for the UCC3817 and VCC = kΩ 270 pF, (unless otherwise noted supply current section PARAMETER Supply current, ...
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SLUS395J - FEBRUARY 2000 - REVISED MARCH 2009 electrical characteristics , T = 0°C to 70°C for the UCC3817 and VCC = kΩ 270 pF, (unless otherwise noted) J, ...
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T = 0°C to 70°C for the UCC3817 and VCC = kΩ 270 pF, (unless otherwise noted feed-forward section PARAMETER ...
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SLUS395J - FEBRUARY 2000 - REVISED MARCH 2009 pin descriptions (continued) IAC: (current proportional to input voltage) This input to the analog multiplier is a current proportional to instantaneous line voltage. The multiplier is tailored for very low distortion from ...
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APPLICATION INFORMATION The UCC3817 is a BiCMOS average current mode boost controller for high power factor, high efficiency preregulator power supplies. Figure 1 shows the UCC3817 in a 250-W PFC preregulator circuit. Off-line switching power converters normally have an input ...
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SLUS395J - FEBRUARY 2000 - REVISED MARCH 2009 power stage L : The boost inductor value is determined by: BOOST V D IN(min BOOST fs ) where D is the duty cycle, ∆I is the inductor ...
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... HEXFET from International Rectifier was chosen because of its low R of 0.4 Ω and the maximum V R DS(on) can be found in the Unitrode Power Supply Design Seminar SEM1200, Topic 6, Design Review: 140 W, [Multiple Output High Density DC/DC Converter]. softstart The softstart circuitry is used to prevent overshoot of the output voltage during start up. This is accomplished by bringing up the voltage amplifier’ ...
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... Because the VFF voltage is generated from line voltage it needs to be adequately filtered to reduce total harmonic distortion caused by the 120 Hz rectified line voltage. Refer to Unitrode Power Supply Design Seminar, SEM−700 Topic 7, [Optimizing the Design of a High Power Factor Preregulator.] A single pole filter was adequate for this design ...
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The R I MOUT(max) V RSENSE + R MOUT I MOUT(max) In this example V was selected to give a dynamic operating range of 1.25 V, which gives an R RSENSE ...
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... The frequency, expressed in terms of input power, can be calculated by the equation VAOUT f for this converter is 10 Hz. A derivation of this equation can be found in the Unitrode Power Supply Design VI Seminar SEM1000, Topic 1, [A 250-kHz, 500-W Power Factor Correction Circuit Employing Zero Voltage Transitions]. Solving for R becomes ...
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R is the R resistor, previously calculated to be 3.9 kΩ. (refer to Figure 3). The gain of the current amplifier I MOUT multiplying crossover ...
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SLUS395J - FEBRUARY 2000 - REVISED MARCH 2009 start up The UCC3818 version of the device is intended to have VCC connected to a 12-V supply voltage. The UCC3817 has an internal shunt regulator enabling the device to be powered ...
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Figure 6. Timing Waveforms for Synchronization Scheme Table 1. Effects of Synchronization on Boost Capacitor Current D(Q2) Q1/Q2 0.35 1.491 A 0.45 1.432 A Table 1 illustrates that the boost capacitor ...
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SLUS395J - FEBRUARY 2000 - REVISED MARCH 2009 capacitor ripple reduction (continued) Gate Drive From Down Stream PWM Figure 7. Synchronizing the UCC3817 to a Down-Stream Converter REFERENCE VOLTAGE vs SUPPLY VOLTAGE 7.60 7.55 7.50 7.45 7. ...
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APPLICATION INFORMATION MULTIPLIER OUTPUT CURRENT vs VOLTAGE ERROR AMPLIFIER OUTPUT 350 IAC = 150 µ 1.4 V 300 250 200 150 100 50 0 0.0 1.0 2.0 3.0 Error Amplifier VAOUT − Voltage Figure 10 MULTIPLIER CONSTANT ...
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PACKAGING INFORMATION Orderable Device (1) Package Type Package Status UCC2817D ACTIVE SOIC UCC2817DG4 ACTIVE SOIC UCC2817DTR ACTIVE SOIC UCC2817DTRG4 ACTIVE SOIC UCC2817DW ACTIVE SOIC UCC2817DWG4 ACTIVE SOIC UCC2817N ACTIVE PDIP UCC2817NG4 ACTIVE PDIP UCC2818D ACTIVE SOIC UCC2818DG4 ACTIVE SOIC ...
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... ACTIVE TSSOP UCC2818PWG4 ACTIVE TSSOP UCC3817D ACTIVE SOIC UCC3817DG4 ACTIVE SOIC UCC3817DTR ACTIVE SOIC UCC3817DTRG4 ACTIVE SOIC UCC3817DW ACTIVE SOIC UCC3817DWG4 ACTIVE SOIC UCC3817DWTR ACTIVE SOIC UCC3817DWTRG4 ACTIVE SOIC UCC3817N ACTIVE PDIP UCC3817NG4 ACTIVE PDIP UCC3818D ACTIVE SOIC UCC3818DG4 ACTIVE SOIC ...
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Orderable Device (1) Package Type Package Status UCC3818DWG4 ACTIVE SOIC UCC3818DWTR ACTIVE SOIC UCC3818DWTRG4 ACTIVE SOIC UCC3818N ACTIVE PDIP UCC3818N/81511 OBSOLETE PDIP UCC3818NG4 ACTIVE PDIP UCC3818PW ACTIVE TSSOP UCC3818PWG4 ACTIVE TSSOP UCC3818PWTR ACTIVE TSSOP UCC3818PWTRG4 ACTIVE TSSOP (1) The ...
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Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or ...
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... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing UCC2817DTR SOIC UCC2818DTR SOIC UCC2818DWTR SOIC DW UCC3817DTR SOIC UCC3817DWTR SOIC DW UCC3818DTR SOIC UCC3818DWTR SOIC DW UCC3818PWTR TSSOP PW PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel Diameter Width (mm) W1 (mm) ...
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... Device Package Type UCC2817DTR SOIC UCC2818DTR SOIC UCC2818DWTR SOIC UCC3817DTR SOIC UCC3817DWTR SOIC UCC3818DTR SOIC UCC3818DWTR SOIC UCC3818PWTR TSSOP PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm 2500 D 16 2500 DW 16 2000 D 16 2500 DW 16 2000 ...
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