TPS65167

Product Summary

The TPS65167 is a Compact LCD Bias Supply for TFT-LCD TV Panels. The TPS65167 offers a compact power supply solution to provide all voltages required by a LCD panel for large size monitor and TV panel applications running from a 12-V supply rail. The TPS65167 generates all 3 voltage rails for the TFT LCD bias (Vs, VGL and VGH). In addition to that it includes a step-down converter and a LDO controller to provide two logic voltage rails. The device incorporates a high voltage switch that can be controlled by a logic signal from the external timing controller (TCON). This function allows gate voltage shaping for VGH. The TPS65167 also features a high voltage stress test where the output voltage of VGH is set to typically 30 V and the output voltage of Vs is programmable to any higher voltage. The high voltage stress test is enabled by pulling the HVS pin high. The device consists of a boost converter to provide the source voltage Vs operating at a fixed switching frequency of 750 kHz. A fully integrated positive charge pump, switching automatically between doubler and tripler mode provides an adjustable regulated TFT gate on voltage VGH. A negative charge pump driver provides adjustable regulated output voltages VGL. To minimize external components the charge pumps for VGH and VGL operate at a fixed switching frequency of 1.5 MHz. The device includes safety features like overvoltage protection of the boost converter; short-circuit protection of VGH and VGL as well as thermal shutdown. The applications of the TPS65167 include LCD Monitor, LCD TV Panel.

Parametrics

TPS65167 absolute maximum ratings: (1)VI Voltage on pin AVIN, VINB, SUPN, GD, BASE:–0.3V to 16.5V; (2)VI Voltage on pin EN, HVS, CTRL: –0.3 to 6 V; (3)VI Voltage on pin FB, FBB, FBP, FBN, FBLDO, RSET:–0.3V to 6V; (4)VI Voltage on pin SW, SUP: 25V; (5)VI Voltage on pin SWB: 20V; (6)VI Voltage on pin POUT, VGH, DRN: 36V; (7)Continuous power dissipation: See Dissipation Rating Table; (8)TJ Operating junction temperature range: –40℃ to 150℃; (9)Tstg Storage temperature range: –65℃ to 150℃.

Features

TPS65167 features: (1)6 V to 14 V Input Voltage Range; (2)Vs Output Voltage Range up to 19 V; (3)Boost Converter With 3.5-A Switch Current; (4)Boost Converter Overvoltage Protection; (5)2.5-A Step-Down Converter With 3.3-V Fixed or Adjustable Output; (6)750 kHz Fixed Switching Frequency; (7)150mA Negative Charge Pump Driver for VGL; (8)50mA Positive Charge Pump for VGH; (9)LDO Controller for Logic Supply; (10)Gate Voltage Shaping for VGH; (11)Temperature Sensor Output; (12)High Voltage Stress Test (HVS); (13)Adjustable Sequencing; (14)Gate Drive Signal for Isolation Switch; (15)Short-Circuit Protection; (16)Internal Softstart; (17)Thermal Shutdown; (18)Available in 6×6 mm 40 Pin QFN Package.

Diagrams