Today's post brings you a schematic circuit diagram of the LP6283 IC. This LP6283 IC is used in TFT display panels of various brands of LCD TVs and LCD monitors for DC-to-DC converters or power management circuits of LCD panels.
LP6283 IC works as a multiple boost converter and buck converter. This IC's operating voltage or input voltage range is DC 8 volts to 14 volts. The LP6283 IC includes three boost converter circuits, including a VGH charge pump regulator circuit, which acts as a voltage boost, and this IC consists of a buck converter or VGL charge pump regulator circuit, which produces a minus voltage (VGL).
LP6283 is a unique IC that provides an entirely safe power supply to millions of thin-film transistors to drive millions of liquid crystal cells installed in LCDs perfectly. The reason is that the LP6283 IC has excellent over-voltage protection, under-voltage detection, over-current protection, and short-circuit protection.
LP6283 IC datasheet, pin function, and schematic circuit diagram
LP6283 IC Schematic Circuit Diagram
LP6283 IC Schematic Circuit Diagram and Pin Configuration
Functional Pin Description
- 1. LDO_I: Bypass pin of capacitor connection from LDO_I to ground.
- 2. OPS: Power source for OPS OPA.
- 3. OGND: Ground for OPA.
- 4. OPP: Non-Inverting Input for OPP OPA.
- 5. OPN: Inverting Input terminal for OPP OPA.
- 6. OPO: OPA Output terminal.
- 7. XAO: Reset Function Output terminal.
- 8. GVOFF: High-voltage switch control input. When GVOFF is high, the high voltage switch between VGH and VGHM is active. And at that moment, the high-voltage Switch in the DRN is closed. When GVOFF is low, the Switch between VGH and VGHM is closed, and the control between VGHM and DRN is active.
- 9. EN: Enable Terminal.
- 10. FB_2: Feedback terminal of the buck regulator. Feedback is taken from the output section connected to an external resistive voltage divider for smooth output voltage.
- 11. OUT: Output sense of buck regulator.
- 12. NC: No connection.
- 13, 14. LX2: Buck Regulator Switching Node. LX2 is connected to the source terminal of the internal NMOS (N-Channel MOSFET) of the LP6283 IC.
- 15. BST: Bootstrap terminal of the buck regulator.
- 16, 17. IN2: Buck Regulator Supply Input. Bypass IN2 to PGND with a capacitor.
- 18. GND: Ground of Analog section.
- 19. VDET: Voltage detection input. It is connected to an external resistive voltage divider (VIN to Analog Ground).
- 20. INVL: Internal voltage regulator and other functions.
- 21. VREG: Internal voltage regulator output terminal.
- 22. FSEL: Frequency selection terminal. This terminal determines the frequency of 500 kHz or 750 kHz.
- 23. CLIMP: This terminal serves for overcurrent protection (OCP) of the boost regulator.
- 24. SS: Soft start control terminal.
RT8292AH IC Schematic Circuit Diagram Here
- 25, 26. LX1: Switching node terminal of the boost regulator.
- 27, 28. PGND: Power Ground.
- 29. GD_I: Output sense terminal of boost regulator.
- 30. GD: Gate Driver of external p-channel MOSFET (PMOS).
- 31. FB_1: Feedback 1 for boost regulator circuit.
- 32. COMP: Compensation pin of boost regulator error amplifier.
- 33. THR: Adjustment input pin (terminal) of the VGHM falling regulation system.
- 34. SUPP: Power supply for VGH charge pump regulator.
- 35. CPGND: Power Ground for charge pump regulator circuit.
- 36. DRVP: Driver output of the VGH charge pump regulator.
- 37. DLY: Delay input.
- 38. FBP: Feedback Pulse input from the VGH charge pump regulator output connected to the voltage divider circuit.
- 39. VGH: GPM input.
- 40. VGHM: GPM output.
- 41. DRN: GPM discharge terminal.
- 42. SUPN: Supply Negative bias (Probably).
- 43. DRVN: Driver Negative output of VGL charge pump regulator.
- 44. GND: Ground of the analog circuit.
- 45. FBN: Feedback: Negative input of the VGL charge pump regulator. Feedback is taken from the voltage divider circuit connected to VGL from REF to control the VGL output.
- 46. REF: Reference Voltage.
- 47. LDO_FB: Feedback input of linear regulator.
- 48. LDO_O: Linear regulator output terminal.
- 49. EP: Exposed Pad connected to ground (Bottom pad of LP6283 IC).
Substitute IC for LP6283 IC
The circuit of 6861AAQ IC is identical to that of LP6283 IC.
Tags: LP6283 IC Pinout, LP6283 Pin Configuration, LP8283 IC Pin Function Details
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