RF amplifier chip - WT20-1809 can replace TPS65235

This single low-noise block converter regulator (LNBR) is suitable for analog and digital satellite receivers. It is a monolithic linear switching voltage regulator specifically designed to provide power and interface signals to two LNB downconverters through a coaxial cable. The WT20-1809 requires few external components, with the boost switch and compensation circuit integrated inside the device. A higher switching frequency is selected to minimize the size of passive filter components, further helping to reduce cost. The high level of component integration ensures extremely low noise and ripple digital. For DiSEqCTM communication, a tone control pin is provided to control the internally generated 22 kHz tone on and off.

A comprehensive set of fault registers is provided, compliant with all common standards, including: overcurrent, thermal shutdown, undervoltage, and power bad.

The device uses a 2-wire bidirectional serial interface, compatible with the I2C™ standard, operating at up to 400 kHz.

A sleep pin can maximize power savings and quickly shut down the device when needed without I2C™ control.

The WT20-1809 is available in a lead-free (Pb) package.

I.RF amplifier chip -Features of WT20-1809:

Sleep pin for ultra-low power mode

Integrated boost MOSFET, current sensing and compensation

Stable with low-voltage ceramic boost capacitors

Adjustable LNB output current limit from 300 to 800 mA

Improved peak current limit ratio via LNB current limit setting

8 programmable LNB output voltage (DAC) levels

LNB overcurrent limiter with shutdown timer

Tracking boost converter minimizes power dissipation

LNB transition time configurable by external capacitor

Push-pull LNB output stage maintains transition time of 13.667→19.667V and 19.667→13.667V even under high capacitive load

Built-in 22 kHz tone oscillator facilitates DiSEqC™ tone encoding even at zero load

Tone generation requires no additional external components

DiagnosticsFeatures： PNG、CPOK

Wide range of protection features: UVLO, OCP, TSD

2-wire serial I2C™ compatible interface

II.RF amplifier chip -Applications of WT20-1809:

Satellite receivers

Satellite TV

Satellite computers