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LTC3783 Datasheet(PDF) 9 Page - Linear Technology |
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LTC3783 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 32 page  LT3760 9 3760fc block DiagraM operaTion TheoperationoftheLT3760isbestunderstoodbyreferring to the typical application circuit on the front page and the Block Diagram in Figure 1. The LT3760 drives 8 strings of LEDs by using a constant switching frequency, current mode boost controller to generate a single output voltage VOUT for the top (anode) of all LED strings. LED string current is generated and controlled by connection of the bottom LED in each string (cathode) to a current source contained in each corresponding LED pin. Each LED pin contains an accurate current sink to ground, program- mable between 20mA to 100mA using a single resistor at the ISET pin. LED channels can be paralleled to achieve higher LED currents. For applications requiring less than 8 strings of LEDs, channels can be paralleled or disabled (connect LED pin to VOUT before startup). For optimum efficiency, VOUT regulates to the lowest possible voltage allowable to maintain regulated current in each LED string. Any OPEN LED fault is indicated by the FAULT pin driven low without effecting the operation of the connected LED strings. The Block Diagram in Figure 1 illustrates the key functions of the LT3760. It can be seen that two external supplies, VREF and INTVCC, are generated by the LT3760. The VREF pinprovidesaprecision1.485Voutputforusewithexternal resistors to program the CTRL, OVPSET and TSET input pins. The INTVCC pin provides a regulated 7V output to supply the gate driver for the boost controller GATE pin. An accurate 1.476V threshold on the SHDN/UVLO pin combinedwithaSHDN/UVLOpincurrenthysteresisallows a programmable resistor divider from VIN to SHDN/UVLO Figure 1. LT3760 Block Diagram 3760 BD + + + – CHANNEL X OVERVOLTAGE AMP LED AMP 6V 1.1V + – + – + – LED LOGIC R S Q + – INTVCC_UV VIN_UV VIN SHDN_UV SHDN/UVLO PWM VREF CTRL 1V SS R 56R 600k 15 14 13 1.476V 1.485V SLOPE 100mV OVER CURRENT 52mV PEAK CURRENT HICCUP__MODE VC EN PWM EN EN 7V(REGULATED) UVLO( +) = 3.8V, UVLO(−) = 3.4V 4.2V( +) 3.7V( −) + – REF 1.485V 27 1 2 4 26 24 VPTAT + – EN GATE SYNC RT SENSE VOUT LEDx 6 TO 9, 20 TO 23 FAULT SOFT START 3 16 18 11 OSC 12 25 17 28 LED CURRENT CONTROL INTVCC OVPSET VC ISET TSET GND PGND (10, 19, EXPOSED PAD (29)) |
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