TPS65235
TPS65235 is LNB Voltage Regulator manufactured by Texas Instruments.
Features
- 1 plete Integrate Solution for LNB and I2C Interface
- Di SEq C 2.x, and Di SEq C 1.x patible
- Supports 5-V, 12-V and 15-V Power Rail
- Up to 1000 m A Accurate Output Current Limit Adjustable by External Resistor
- Boost Switch Peak Current Limit Proportional to LDO Current Limit
- Boost Converter with 140-mΩ Low Rds(on) Internal Power Switch
- Boost Switching Frequency 1-MHz or 500-k Hz Selectable
- Dedicated Enable Pin for Non-I2C Application
- Low Drop Output LDO With Push-pull Output Stage for VLNB Output
- Built-in Accurate 22-k Hz Tone Generator and External Tone Input Support
- Supports Both External 44-k Hz and 22-k Hz Tone Input
- Adjustable Soft-start and 13-V to 18-V Voltage Transition Time
- 650 m V to 750-m V, 22-k Hz Tone Amplitude Selection
- I2C Registers Accessible with EN Low
- Short Circuit Dynamic Protection
- Diagnostics for Output Voltage Level, Di SEq C Tone Input and Output, Current Level, and Cable Connection
- Thermal Protection Available
- 20-Lead WQFN 3-mm x 3-mm (RUK) Package
3 Description
Designed for analog and digital satellite receivers, the TPS65235 is a monolithic voltage regulator with I2C interface; specifically to provide the 13-V to 18-V power supply and the 22-k Hz tone signal to the LNB down converter in the antenna dish or to the multiswitch box. It offers a plete solution with minimum ponent count, low power dissipation together with simple design and I2C standard interface.
TPS65235 features high power efficiency. The boost converter integrates a 140-mΩ power MOSFET running at 1 MHz or 500 k Hz selectable switching frequency. Drop out voltage at the linear regulator is 0.8 V to minimize power loss. TPS65235 provides multiple ways to generate the 22 k Hz signal. Integrated linear regulator with push-pull output stage generates 22-k Hz tone signal superimposed at the output even at zero loading. Current limit of linear regulator can be programmed by external resistor with ±10% accuracy. Full range of diagnostic read by I2C is...
