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ATL431LI Datasheet(PDF) 19 Page - Texas Instruments |
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ATL431LI Datasheet(HTML) 19 Page - Texas Instruments |
19 / 29 page UCC28740 PWM Controller VIN AC ATL431LI V OUT VDD VS FB HV DRV CS GND VDD VSC TBLK VPC DRV UCC24636 SR Controller Copyright © 2018, Texas Instruments Incorporated 19 ATL431LI ATL432LI www.ti.com SLVSDU6D – JULY 2017 – REVISED NOVEMBER 2019 Product Folder Links: ATL431LI ATL432LI Submit Documentation Feedback Copyright © 2017–2019, Texas Instruments Incorporated 11.2.4 Isolated Flyback with Optocoupler Figure 28. Isolated Flyback with Optocoupler 11.2.4.1 Design Requirements The ATL431LI is used in the feedback network on the secondary side for a isolated flyback with optocoupler design. Figure 28 shows the simplified flyback converter that used the ATL431LI. For this design example, use the parameters in Table 4 as the input parameters. Table 4. Design Parameters DESIGN PARAMETER EXAMPLE VALUE Voltage Output 20 V Feedback Network Quiescent Current (Iq) <40 mW 11.2.4.1.1 Detailed Design Procedure In this example a simplified design procedure will be discussed. The compensation network for the feedback network is beyond the scope of this section. Details on compensation network can be found on SLUA671. The goal of this design is to design a low standby current feedback network to meet the Europe CoC Tier 2 and United States DoE Level VI requirements. To meet the design requirements, the system standby power needs to be below 75mW. In order to meet this, the feedback network needs to consume less than 40mW to allow margin for the power losses on the primary side controller and passive components and this can pose a challenge in systems greater than 10V. |
Similar Part No. - ATL431LI_V02 |
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Similar Description - ATL431LI_V02 |
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