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LT3476 Datasheet(PDF) 8 Page - Linear Technology |
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LT3476 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 32 page  LT3760 8 3760fc pin FuncTions CTRL (Pin 1): CTRL pin voltage below 1V controls LED current. CTRL voltage can be set by a resistor divider from VIN, VREF or an external voltage source. LED current derating versus temperature is achievable if the voltage programmed at the CTRL pin has a negative temperature coefficient using an external resistor divider from VREF pin to GND with temperature dependent resistance. TSET (Pin 2): Programs LT3760 junction temperature breakpoint past which LED current will begin to derate. Program using a resistor divider from VREF to GND. VREF (Pin 3): 1.485V Reference Output Pin. This pin can supply up to 150µA. Can be used to program CTRL, TSET and OVPSET pin voltages using resistor dividers to GND. ISET (Pin 4): Resistor to GND Programs LED pin current. See Table 6 in the Applications Information Section. NC (Pin 5): No Connect. Okay to leave open or to connect to GND. LEDx (Pins 6 to 9, 20 to 23): 8 LED Driver Outputs. Each outputcontainsanopencollectorconstantcurrentsink.LED currents are programmable from 20mA to 100mA using a single resistor at the ISET pin. Connect the cathode of each LED string to an LED pin. Connect the anode of each LED string to VOUT. Channels can be paralleled for greater LED current or individually disabled (connect LED to VOUT). PGND (Pins 10, 19, Exposed Pad Pin 29): Power grounds for the IC and the converter. The package has an exposed pad (Pin 29) underneath the IC which is the best path for heat out of the package. Pin 29 should be soldered to a continuous copper ground plane under the device to reduce die temperature and increase the power capability of the LT3760. SENSE (Pin 11): The Current Sense Input for the Control Loop. Connect this pin to the sense resistor in the source of the external power MOSFET. GATE (Pin 12): Drives the gate of an N-channel MOSFET from 0V to INTVCC. INTVCC(Pin 13): A 7V LDO supply generated from VIN and used to power the GATE driver and some control circuitry. Must be bypassed with a 4.7µF capacitor to PGND. VIN (Pin 14): Input Supply Pin. Must be locally bypassed with a 1µF capacitor to PGND. SHDN/UVLO(Pin15): TheSHDN/UVLOpinhasanaccurate 1.476Vthresholdandcanbeusedtoprogramanundervolt- agelockout(UVLO)thresholdforsysteminputsupplyusing a resistor divider from supply to GND. A 2.4µA pin cur- rent hysteresis allows programming of UVLO hysteresis. SHDN/UVLO above 1.476V turns the part on and removes a 2.4µA sink current from the pin. SHDN/UVLO < 0.7V reduces VIN current < 20µA. If the shutdown function is not required, it should be forced above 1.476V or con- nected directly to VIN. FAULT (Pin 16): Active low if any or all LED strings have an open fault. If fault(s) removed, FAULT flag returns high. Fault status is only updated during PWM high state and latched during PWM low. SYNC (Pin 17): Allows synchronization of boost converter switchingfrequencytoanexternalclock.RTresistorshould be programmed for fOSC 20% below SYNC frequency. If unused, connect to GND. VOUT (Pin 18): Boosted Output Voltage of the Converter. Connect a capacitor from this pin to PGND. Connect the anode of each LED (string) to VOUT. GND (Pin 24): Signal Ground. RT (Pin 25): A resistor to GND programs switching fre- quency fOSC between 0.1MHz and 1MHz. VC (Pin 26): Output of Both Transconductance Error Amplifiers for the Converter Regulation Loop. The most commonly used gm error amplifier (LED) regulates VOUT to ensure no LED pin falls below 1V. The other gm error amplifier (OVP) is activated if all LEDs fail open and a regulated maximum VOUT is required. Connect a resistor and capacitor in series from the VC pin to GND. PWM(Pin27):InputPinforPWMDimmingControl.Above 1.4V allows converter switching and below 0.7V disables switching. The PWM signal can be driven from 0V to 6V. If unused, connect to VREF. OVPSET(Pin28):ProgramsmaximumallowedVOUTregu- lation level if all LEDs are open circuit. Program using a resistor divider from VREF to GND. |
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