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ATL431LI_V02 Datasheet(Hoja de datos) 19 Page - Texas Instruments

No. de Pieza. ATL431LI_V02
Descripción  ATL431LI / ATL432LI High Bandwidth Low-Iq Programmable Shunt Regulator
Descarga  29 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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 19 page
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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.




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