Datasheet LT3798 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Isolated No Opto-Coupler Flyback Controller with Active PFC |
| Pages / Page | 20 / 7 — PIN FUNCTIONS GATE (Pin 14):. VIN_SENSE (Pin 16):. SENSE (Pin 15):. GND … |
| File Format / Size | PDF / 423 Kb |
| Document Language | English |
PIN FUNCTIONS GATE (Pin 14):. VIN_SENSE (Pin 16):. SENSE (Pin 15):. GND (Exposed Pad Pin 17):. BLOCK DIAGRAM
Model Line for this Datasheet
Text Version of Document
LT3798
PIN FUNCTIONS GATE (Pin 14):
N-Channel FET Gate Driver Output. Switches
VIN_SENSE (Pin 16):
Line Voltage Sense Pin. The pin is between INTVCC and GND. Driven to GND during shutdown used for sensing the AC line voltage to perform power state and stays high during low voltage states. factor correction. Connect a resistor in series with the
SENSE (Pin 15):
The Current Sense Input for the Control line voltage to this pin. If no PFC is needed, connect this Loop. Kelvin connect this pin to the positive terminal of the pin to INTVCC with a 25k resistor. switch current sense resistor, RSENSE, in the source of the
GND (Exposed Pad Pin 17):
Ground. The exposed pad NFET. The negative terminal of the current sense resistor of the package provides both electrical contact to ground should be connected to the GND plane close to the IC. and good thermal contact to the printed circuit board. The exposed pad must be soldered to the circuit board for proper operation.
BLOCK DIAGRAM
VRECTIFIED D2 R3 • R13 R1 C2 D1 R4 L1C T1 V + OUT C1 C3 L1A L1B C7 R5 R15 R14 V – OUT N:1 DCM EN/UVLO VIN_SENSE VIN STARTUP 1.22V – INTERNAL REG INTVCC +A7 + ONE R7 C5 + SHOT –A2 CURRENT COMPARATOR 600mV V R11 REF R8 – + S&H –A1 OVP A9 S R GATE FB A3 Q COMP+ S R9 R12 MASTER DRIVER C6 1M LATCH SENSE COMP– SW1 A4 R6 CTRL1 GND LOW OUTPUT – MINIMUM CURRENT CTRL2 +A5 A6 OSCILLATOR MULTIPLIER CTRL3 S&H FB + 1.22V –A8 VC R10 3798 BD C4 3798fa 7 Document Outline Description Features Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Typical Applications Package Description Revision History Typical Application Related Parts
PIN FUNCTIONS GATE (Pin 14):
N-Channel FET Gate Driver Output. Switches
VIN_SENSE (Pin 16):
Line Voltage Sense Pin. The pin is between INTVCC and GND. Driven to GND during shutdown used for sensing the AC line voltage to perform power state and stays high during low voltage states. factor correction. Connect a resistor in series with the
SENSE (Pin 15):
The Current Sense Input for the Control line voltage to this pin. If no PFC is needed, connect this Loop. Kelvin connect this pin to the positive terminal of the pin to INTVCC with a 25k resistor. switch current sense resistor, RSENSE, in the source of the
GND (Exposed Pad Pin 17):
Ground. The exposed pad NFET. The negative terminal of the current sense resistor of the package provides both electrical contact to ground should be connected to the GND plane close to the IC. and good thermal contact to the printed circuit board. The exposed pad must be soldered to the circuit board for proper operation.
BLOCK DIAGRAM
VRECTIFIED D2 R3 • R13 R1 C2 D1 R4 L1C T1 V + OUT C1 C3 L1A L1B C7 R5 R15 R14 V – OUT N:1 DCM EN/UVLO VIN_SENSE VIN STARTUP 1.22V – INTERNAL REG INTVCC +A7 + ONE R7 C5 + SHOT –A2 CURRENT COMPARATOR 600mV V R11 REF R8 – + S&H –A1 OVP A9 S R GATE FB A3 Q COMP+ S R9 R12 MASTER DRIVER C6 1M LATCH SENSE COMP– SW1 A4 R6 CTRL1 GND LOW OUTPUT – MINIMUM CURRENT CTRL2 +A5 A6 OSCILLATOR MULTIPLIER CTRL3 S&H FB + 1.22V –A8 VC R10 3798 BD C4 3798fa 7 Document Outline Description Features Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Typical Applications Package Description Revision History Typical Application Related Parts
