TPS65178A IC Schematic Circuit Diagram and Datasheet

TPS65178 or TPS65178A IC is fully programmable with DAC (Digital to Analog Converter). It can provide all bias voltages for TFT LCD TVs and monitor display panels. The TPS65178 IC features an internal 6-channel gamma buffer, VCOM reference, and dynamic gain control.

The TPS65178 IC has four synchronous buck converters, which precisely output the VCORE, HVDD, VEPI, and VCC voltages. Pins 11, 12, 13, and pin 14 of this IC are supplied with positive voltage (VIN) and separate filter capacitors. The VIN voltage range of the TPS65178 IC is 8.6 volts to 14.7 volts.

Now, let's look at the output voltages of  TPS65178 IC. The output range is slightly different for different sizes of TFT LCDs, as shown below:

Boost converter voltage VDD - 12 Volts to 19 Volts (6Bit)

Positive charge pump voltage VGH - 19 Volts to 34 Volts (4Bit)

Buck converter voltage VEPI - 0.9 Volts to 2.4 Volts (4 Bit)

Buck converter voltage VCORE - 0.9 Volts to 2.4 Volts (4 Bit)

Buck converter Voltage VCC - 3.0 Volts to 3.7 Volts (3 Bit)

Gamma voltages: What is the function of gamma voltage in LCD panel, what is the problem if gamma voltages are incorrect, and what is the gamma reference voltage with gamma output voltage? You can watch THIS VIDEO.

TPS65178 IC Schematic Circuit Diagram with Pinout

A schematic Circuit Diagram of  TPS65178 IC below shows the pinout and pin functions of the IC, so the datasheet PDF of TPS65178 IC is not published separately on this page.

TPS65178 is a programmable IC. All output voltages and currents of this IC are determined by I²C programming.

What is I2C  Programming

I²C  programming establishes communication between the microcontroller and peripheral devices by sending and receiving data over two wires (SDA and SCL). It ensures initialization, addressing, and correct start and stop conditions. It provides data transfer between connected devices.

Observe the circuit diagram of the TPS65175 IC. The pin-27 of the IC is SDA, and data is input and output through this pin. Pin-28 is SCL. The clock pulse is transferred through this pin. These two pins are connected to the SDA and SCL pins of the two T-Con memory ICs. Watch THIS VIDEO to learn how to do I2C programming in memory IC.

TPS65178 IC Schematic Circuit Diagram and Pinout

Components List and its value of TPS65178 IC Circuit Diagram:

Value of Transistors:

Q1- MMBT2907ALT1, Q2- MMBT2222A

Value of Inductors:

L1- 10µH, L2- 6.8µH, L3- 10µH, L4 2.2µH, L5- 2.2µH

Value of Diodes:

D1- SL22, D2- SL22, D3- BAT54S, D4- BAT54S, D5- BAT54S, D6- BAT54S

Value of Resistors:

R1- 33KΩ, R2- 2.2KΩ R3- 2.2KΩ,  R4- 10KΩ, R5- 47KΩ, R6- 120KΩ, R7- 100KΩ, R8- 100KΩ

Value of Capacitors:

C1- 10µF, C2- 10µF, C3- 10µF, C4- 10µF,  C5- 10µF, C6- 10µF, C7- 10µF, C8- 1µF, C9- 0.1µF, C10- 10µF, C11- 1µF, C12- 10µF, C13- 10µF, C14 and C15- 10µF, C16-C17-C18-C19- 10µF, C20- 4.7µF, C21- 4.7µF, C22- 0.22µF, C23- 0.1µF, C24- 4.7µF, C25- 0.1µF, C28- 0.22µF, C29- 4.7µF.