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LT3492 Datasheet(PDF) 6 Page - Linear Technology |
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LT3492 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LT3492 6 3492f CTRL1, CTRL2, CTRL3: LED Current Adjustment Pins. Sets voltage across external sense resistor between ISP and ISN pins of the respective converter. Setting CTRL voltage to be less than 1V will control the current sense voltage to be one-tenth of CTRL voltage. If CTRL voltage is higher than 1V, the default current sense voltage is 100mV. The CTRL pin must not be left floating. FADJ: Switching Frequency Adjustment Pin. Setting FADJ voltage to be less than 1V will adjust switching frequency up to 2.1MHz. If FADJ voltage is higher than 1V, the default switching frequency is 2.1MHz. The FADJ pin must not be left floating. GND: Signal Ground and Power Ground. Solder exposed pad directly to ground plane. ISN1, ISN2, ISN3: Noninverting Input of Current Sense Error Amplifier. Connect directly to LED current sense resistor terminal for current sensing of the respective converter. ISP1, ISP2, ISP3: Inverting Input of Current Sense Error Amplifier. Connect directly to other terminal of LED current sense resistor terminal of the respective converter. OVP1, OVP2, OVP3: Open LED Protection Pins. A voltage higher than 1V on OVP turns off the internal main switch of the respective converter. Tie to ground if not used. PWM1, PWM2, PWM3: Pulse Width Modulated Input. Signal low turns off the respective converter, reduces quiescent supply current and causes the VC pin for that converter to become high impedance. PWM pin must not be left floating; tie to VREF if not used. SHDN: Shutdown Pin. Used to shut down the switching regulator and the internal bias circuits for all three convert- ers. Tie to 1.5V or greater to enable the device. Tie below 0.4V to turn off the device. SW1, SW2, SW3: Switch Pins. Collector of the internal NPN power switch of the respective converter. Connect to external inductor and anode of external Schottky recti- fier of the respective converter. Minimize the metal trace area connected to this pin to minimize electromagnetic interference. TG1, TG2, TG3: The Gate Driver Output Pin for Disconnnect P-Channel MOSFET. One for each converter. When the PWM pin is low, the TG pin pulls up to ISP to turn off the external MOSFET. When the PWM pin is high, the external MOSFET turns on. ISPn-TGn is limited to 6.5V to protect the MOSFET. Leave open if the external MOSFET is not used. VC1,VC2,VC3:ErrorAmplifierCompensationPins.Connect a series RC from these pins to GND. VIN: Input Supply Pin. Must be locally bypassed. Powers the internal control circuitry. VREF: Reference Output Pin. Can supply up to 200μA. The nominal Output Voltage is 2V. PIN FUNCTIONS |
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