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LT3592EMSE-TR Datasheet(PDF) 7 Page - Linear Technology |
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LT3592EMSE-TR Datasheet(HTML) 7 Page - Linear Technology |
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7 / 24 page  LT3592 7 3592fa PIN FUNCTIONS RT(Pin1):Programsthefrequencyoftheinternaloscillator. Connect a resistor from RT to ground. Refer to Table 1 or the Typical Performance Characteristics for resistor values that result in desired oscillator frequencies. BRIGHT (Pin 2): Used to program a 10:1 dimming ratio for the LED current. Drive this pin above 1.4V to command maximum intensity or below 0.3V to command minimum intensity. This pin can be PWMed at 150Hz for brightness control between the 1x and 10x current levels. SHDN (Pin 3): Used to shutdown the switching regulator and the internal bias circuits. This pin can be PWMed at 150Hz for brightness control. VIN (Pin 4): Supplies current to the LT3592’s internal cir- cuitry and to the internal power switches. Must be locally bypassed. For automotive applications, a pi network with a cap from VIN to GND, a series inductor connected between VIN and the power source, and another cap from the far end of the inductor to GND is recommended. DA (Pin 5): Allows the external catch diode current to be sensed to prevent current runaway, such as when VIN is high and the duty cycle is very low. Connect this pin to the anode of the external catch Schottky diode. SW (Pin 6): The SW pin is the output of the internal power switch. Connect this pin to the inductor and the cathode of the switching diode. BOOST (Pin 7): Provides a drive voltage, higher than the input voltage to the internal bipolar NPN power switch. BOOST will normally be tied to the SW pin through a 0.1μF capacitor. An internal Schottky is provided for the boost function and an external diode is not needed. An external Schottky diode should be connected between BOOST and CAP for single LED applications or whenever a higher BOOST voltage is desired. CAP (Pin 8): Output of the step-down converter and also an input to the LED current sense amplifier. Connect the filter capacitor, inductor, and the top of the external LED current sense resistor to this pin. OUT (Pin 9): Drives the LED or LEDs and is the other input to the LED current sense amplifier. Connect this pin to the anode of the top LED in the string, the bottom of the external LED current sense resistor, and the top of the VFB resistor divider. VFB (Pin 10): The feedback node for the output voltage control loop. Tie this node to a resistor divider between OUT and GND to set the maximum output voltage of the step- down converter according to the following formula: V OUT = 1.21• R1 +R2 R2 where R1 connects between OUT and VFB and R2 connects between VFB and GND. GND, EXPOSED PAD (Pin 11): The underside exposed pad metal of the package provides both electrical contact to ground and good thermal contact to the printed circuit board. The device must be soldered to the circuit board for proper operation. |
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