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LED DRIVER.asc
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Version 4
SHEET 1 3108 2260
WIRE 3024 816 2992 816
WIRE 2320 896 2320 864
WIRE 2320 1024 2320 976
WIRE 2320 1024 2016 1024
WIRE 2624 1024 2624 880
WIRE 2624 1024 2320 1024
WIRE 2320 1056 2320 1024
WIRE 1136 1072 1136 1024
WIRE 1520 1072 1456 1072
WIRE 1552 1072 1520 1072
WIRE 1664 1072 1552 1072
WIRE 1456 1104 1456 1072
WIRE 2800 1104 2800 880
WIRE 2800 1104 2320 1104
WIRE 1664 1136 1664 1072
WIRE 1792 1136 1792 1072
WIRE 2320 1136 2320 1120
WIRE 2464 1136 2320 1136
WIRE 2320 1168 2320 1136
WIRE 2464 1168 2464 1136
WIRE 1456 1200 1456 1168
WIRE 1552 1200 1552 1072
WIRE 1584 1200 1552 1200
WIRE 2240 1200 1872 1200
WIRE 1136 1216 1136 1152
WIRE 1312 1280 912 1280
WIRE 1584 1280 1312 1280
WIRE 2016 1280 2016 1024
WIRE 2016 1280 1872 1280
WIRE 2176 1280 2016 1280
WIRE 2240 1280 2240 1200
WIRE 2320 1280 2320 1248
WIRE 2320 1280 2240 1280
WIRE 2464 1280 2464 1232
WIRE 2320 1344 2320 1280
WIRE 1584 1360 1344 1360
WIRE 1968 1360 1872 1360
WIRE 2064 1360 2048 1360
WIRE 2080 1360 2064 1360
WIRE 2176 1360 2176 1280
WIRE 2176 1360 2144 1360
WIRE 912 1376 912 1280
WIRE 1344 1392 1344 1360
WIRE 2064 1424 2064 1360
WIRE 1584 1440 1456 1440
WIRE 1968 1440 1872 1440
WIRE 912 1488 912 1456
WIRE 1344 1488 1344 1472
WIRE 1456 1488 1456 1440
WIRE 1456 1488 1344 1488
WIRE 2320 1488 2320 1408
WIRE 1968 1504 1968 1440
WIRE 1344 1520 1344 1488
WIRE 2064 1552 2064 1488
WIRE 1728 1584 1728 1488
WIRE 1344 1632 1344 1600
WIRE 1968 1632 1968 1584
WIRE 2320 1632 2320 1552
FLAG 1728 1584 0
FLAG 1456 1200 0
FLAG 1344 1632 0
FLAG 2320 1632 0
FLAG 2464 1280 0
FLAG 2464 1136 Vcap1
FLAG 2016 1024 Vsw1
FLAG 1136 1216 0
FLAG 1136 1024 Vin
FLAG 2320 864 Vin
FLAG 1792 1072 Vcap1
FLAG 2240 1200 Vled1
FLAG 2064 1552 0
FLAG 1968 1632 0
FLAG 912 1488 0
FLAG 1312 1280 Vpwm
FLAG 1520 1072 Vin
SYMBOL ind 2304 880 R0
SYMATTR InstName L1
SYMATTR Value 47µ
SYMATTR SpiceLine Rpar=5K
SYMBOL cap 2080 1376 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C1
SYMATTR Value 100p
SYMATTR SpiceLine V=50 Irms=20.8m Rser=5.448 Lser=0 mfg="KEMET" pn="C0603C101K5RAC" type="X7R"
SYMBOL LED 2336 1344 M0
WINDOW 123 24 92 Left 2
SYMATTR Value2 N=2
SYMATTR InstName D1
SYMATTR Value LXHL-BW02
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL PowerProducts\\LT3476 1728 1312 R0
SYMATTR InstName U1
SYMBOL res 2304 1152 R0
SYMATTR InstName Rsense
SYMATTR Value 0.25
SYMBOL cap 2448 1168 R0
SYMATTR InstName C2
SYMATTR Value 1.2µ
SYMATTR SpiceLine V=25 Irms=6.52 Rser=0.0167623 Lser=0 mfg="KEMET" pn="C1210C125K3RAC" type="X7R"
SYMBOL res 1984 1488 M0
SYMATTR InstName Rt
SYMATTR Value 44.2K
SYMBOL schottky 2336 1056 M0
SYMATTR InstName D2
SYMATTR Value 1N5818
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 1440 1104 R0
SYMATTR InstName C3
SYMATTR Value 2.2µ
SYMBOL res 1328 1376 R0
SYMATTR InstName R1
SYMATTR Value 160K
SYMBOL res 1328 1504 R0
SYMATTR InstName R2
SYMATTR Value 40K
SYMBOL VOLTAGE 1136 1056 R0
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL res 2064 1344 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName Rcomp
SYMATTR Value 4.99K
SYMBOL cap 2048 1424 R0
SYMATTR InstName C4
SYMATTR Value 2.2n
SYMBOL voltage 912 1360 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(0 5 1m 1u 1u 9m 10m)
SYMBOL diode 2304 1488 R0
SYMATTR InstName D3
SYMATTR Value 1N914
SYMBOL res 3008 800 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 100
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL cap 3024 832 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C5
SYMATTR Value 0.0047µ
SYMATTR SpiceLine V=6.3 Irms=120m Rser=1.30834 Lser=0 mfg="KEMET" pn="C0603C472K9RAC" type="X7R"
TEXT 856 968 Left 2 !.tran 12m startup
TEXT 776 768 Left 2 ;LT3476 LED Driver for up to 4 strings of 8 LEDs programmed at 190 mA (a single string is simulated here). Similar behavior than LP8860-Q1 and TPS61194
TEXT 904 816 Left 2 ;Use Rt to set the DC/DC boost converter frequency (140K -> 0.2M, 44.2K -> 0.6M, etc.) and R1/R2 to set the output current
TEXT 1144 864 Left 2 ;The PWM pulsated waveform controls the LED dimming at 100 Hz (5 V pulses)