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UCC28C53 Datasheet(PDF) 24 Page - Texas Instruments |
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UCC28C53 Datasheet(HTML) 24 Page - Texas Instruments |
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24 / 48 page  R28 100 D3 BAR74 C26 2uF D5 BAR74 R14 20k 40% C16 5.6nF C15 1uF C14 1uF C13 0.22uF C12 3300pF C11 1500pF D6 BZX84C15LT1 UCC38C4x 1 COMP 2 FB 3 CS 4 RT/CT 5 GND 6 OUT 7 V CC 8 REF U2 C22 4.7nF C23 680pF C24 0.1uF C10 2.7nF 1 2 3 4 T2 Q4 Q3 L1 4.7uH C21 0.1uF C20 470uF C19 470uF 3r3V PWRGND D2 C2 1nF C18 4700pF C25 0.047uF VinN VinP C9 0.1uF UCC3961 4 FB 5 R T 6 REF 7 AGND 8 V S 9 CS 10 PGND 11 OUT 1 OVS 2 SD 3 SS 12 V DD 13 S T 14 UVS U1 C1 470uF C3 10nF C4 0.22uF C5 0.1uF C6 470pF C7 100pF C8 1uF C17 4700pF D1 Q1 Q2 TPS2832 8 BOOT 1 IN 6 BTLO 3 DT 7 HIDR 4 V CC 2 PGND 5 LODR U4 T1 R19 20 R22 100 R18 7.5k R17 20k R16 21.5k R15 50k R23 402 R24 20k R25 20k R12 200 R13 300 R27 4.7 R26 4.7 R7 10k R21 10 R1 32.4k R2 1.2k R3 2.4k R4 1.5k R5 76.8k R6 4.7 R8 5.1k R9 0.33 R10 1k R11 46.4k R20 10 Copyright © 2016, Texas Instruments Incorporated Figure 9-2. Forward Converter with Synchronous Rectification Using the UCC38C42 as the Secondary- Side Controller 9.2 Typical Application A typical application for the UCC28C42 controller in an off-line flyback converter is shown in Figure 9-3. The controller uses an inner current control loop that contains a small current sense resistor which senses the primary inductor current ramp. This current sense resistor transforms the inductor current waveform to a voltage signal that is input directly into the primary side PWM comparator. This inner loop determines the response to input voltage changes. An outer voltage control loop involves comparing a portion of the output voltage to a reference voltage at the input of an error amplifier. When used in an off-line isolated application, the voltage feedback of the isolated output is accomplished using a secondary-side error amplifier and adjustable voltage reference, such as the TL431. The error signal crosses the primary to secondary isolation boundary using an opto-isolator whose collector is connected to the VREF pin and the emitter is connected to FB. The outer voltage control loop determines the response to load changes. UCC28C53, UCC28C54, UCC28C55 UCC28C56H, UCC28C57H, UCC28C57L, UCC28C59 SLUSER8 – JUNE 2022 www.ti.com 24 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: UCC28C53 UCC28C54 UCC28C55 UCC28C56H UCC28C57H UCC28C57L UCC28C59 |
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