$ 1 32 0.00390625 0 5 50 Black 2048 2048 false r 384 768 480 768 0 23 > R limit r 704 800 704 960 0 10000 > R1 r 704 1024 704 1152 0 50000 > R2 220 512 992 512 1056 1024 TL431 g 512 1184 512 1248 0 R 352 736 352 672 0 0 1 10 0 0 0.5 299 960 928 1120 1056 0 0 0 0 w 992 1056 992 1184 0 w 992 1184 704 1184 0 w 704 768 992 768 0 > Vout w 992 768 992 928 0 x 480 640 512 640 4 40 Vout%20%3D%281%2BR1%2FR2%29%2AVref%0A w 1184 768 1280 768 0 w 992 1184 1280 1184 0 w 1280 1184 1280 1024 0 w 1280 768 1280 960 3 > Vload w 704 992 672 992 0 w 704 992 704 960 2 w 704 992 704 1024 2 > Vref w 704 1184 704 1152 0 w 704 768 704 800 0 w 512 1184 704 1184 0 w 512 1120 672 1120 0 w 512 1120 512 1184 0 w 672 1120 672 1024 0 x 544 800 576 800 4 14 cathode%20current%0Amin%20required%0A1mA%0A w 384 768 352 768 0 w 352 768 352 736 0 w 512 768 480 768 0 w 512 768 704 768 0 s 1120 768 1184 768 0 0 false w 992 768 1120 768 0 299 1376 928 1600 1088 0 3 0 0 Vload.v%2AVload.i x 1600 992 1632 992 20 42 Watts x 128 864 160 864 9 20 transposition%20to%20solve%20for%20R2%20%0Ato%20obtain%20Required%20Vout%0Awith%20fixed%20R1%0A%0A%28Vout%2FVref%29%20-%201%20%3D%20R1%2FR2%0Atherefore%0AR2%20%3D%20R1%2F%28%28Vout%2FVref%29-1%29 w 96 1696 1824 1696 0 299 640 1312 1120 1440 0 3 0 0 %28R1.vd%2FR1.i%29%2F%28%28Vout.v%2F2.5%29-1%29 w 96 1696 96 512 0 299 640 1472 1248 1600 0 3 0 0 %281%2B%28R1.Vd%2FR1.i%29%2F%28R2.Vd%2FR2.i%29%29%2AR2.Vd x 544 1344 544 1376 20 55 R2 x 480 1504 512 1504 20 55 Vout r 1280 960 1280 1024 0 10 w 512 1024 512 768 3 > Pz 299 128 1248 320 1344 0 3 0 0 -Pz.v%2APz.i > watts x 128 1216 160 1216 20 20 TL431%20dissipation x 320 1280 416 1248 20 40 W%0A