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LT3799 Datasheet(PDF) 7 Page - Linear Technology |
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LT3799 Datasheet(HTML) 7 Page - Linear Technology |
7 / 20 page LT3798 7 3798f PIN FUNCTIONS BLOCK DIAGRAM VOUT + VOUT – VRECTIFIED D1 C7 L1A T1 N:1 L1B C2 SW1 R1 R3 C3 1.22V VIN R14 R13 D2 L1C C1 R15 R4 R5 VIN_SENSE EN/UVLO DCM STARTUP INTERNAL REG VREF OVP FB S&H COMP+ COMP– CTRL1 CTRL3 CTRL2 FB S&H VC 1.22V C6 C4 R8 R9 R10 + – A8 – + A5 A6 MINIMUM MULTIPLIER A3 R12 1M + – 600mV ONE SHOT + – A2 + – A1 CURRENT COMPARATOR R Q S S MASTER LATCH LOW OUTPUT CURRENT OSCILLATOR A4 R11 R7 DRIVER GND GATE INTVCC SENSE R6 C5 3798 BD – + A7 A9 GATE (Pin 14): N-Channel FET Gate Driver Output. Switches between INTVCC and GND. Driven to GND during shutdown state and stays high during low voltage states. SENSE (Pin 15): The Current Sense Input for the Control Loop. Kelvin connect this pin to the positive terminal of the switch current sense resistor, RSENSE, in the source of the NFET. The negative terminal of the current sense resistor should be connected to the GND plane close to the IC. VIN_SENSE (Pin 16): Line Voltage Sense Pin. The pin is used for sensing the AC line voltage to perform power factor correction. Connect a resistor in series with the line voltage to this pin. If no PFC is needed, connect this pin to INTVCC with a 25k resistor. GND (Exposed Pad Pin 17): Ground. The exposed pad of the package provides both electrical contact to ground and good thermal contact to the printed circuit board. The exposed pad must be soldered to the circuit board for proper operation. |
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