SLVSCV5D March 2015 – October 2016 ATL431 , ATL432
PRODUCTION DATA.
When using ATL43x in a flyback supply (see Figure 29) it is often common for designers to place the bias resistor between the Anode of the Opto-Coupler and the output voltage (VO = 24 V). However, this makes ATL43x more susceptible to EOS/ESD damage. Therefore, TI recommends to place the bias resistor between the Cathodes of the Opto-Coupler and ATL43x, as shown in Figure 29. For further explanation, see Designing with the "Advanced" TL431, ATL431, SLVA685.
When using ATL43x as a Linear Regulator to supply a load, designers will typically use a bypass capacitor on the output/cathode pin. Be sure that the capacitance is within the stability criteria shown in Figure 14 through Figure 21.
To not exceed the maximum cathode current, be sure that the supply voltage is current limited. Also, be sure to limit the current being driven into the Ref pin, as not to exceed it's absolute maximum rating.
For applications shunting high currents, pay attention to the cathode and anode trace lengths, adjusting the width of the traces to have the proper current density.