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Part Number: LNBK20
Description: Intended for analog and digital satellite receivers, the LNBK is a monolithic linear voltage regulator, assembled in Mu...
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LNBK20
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DataSheet
General Description
LNBK20 General Description
Intended for analog and digital satellite receivers, the LNBK is a monolithic linear voltage regulator, assembled in Multiwatt-15, PowerSO-20 and PowerSO-10, specifically designed to provide the powering voltages and the interfacing signals to the LNB downconverter situated in the antenna via the coaxial cable. It has the same functionality of the LNBP1X and LNBP20 series, at a reduced output current capability. Since most satellite receivers have two antenna ports, the output voltage of the regulator is available at one of two logic-selectable output pins (LNBA, LNBB). When the IC is powered and put in Stand-by (EN pin LOW), both regulator outputs are disabled to allow the antenna downconverters to be supplied/controlled by others satellite receivers sharing the same coaxial lines. In this occurrence the device will limit at 3 mA (max) the backward current that could flow from LNBA and LNBB output pins to GND.
For slave operation in single dish, dual receiver systems, the bypass function is implemented by an electronic switch between the Master Input pin (MI) and the LNBA pin, thus leaving all LNB powering and control functions to the Master Receiver. This electronic switch is closed when the device is powered and EN pin is LOW.
The regulator outputs can be logic controlled to be 13 or 18 V (typ.) by mean of the VSEL pin for remote controlling of LNBs. Additionally, it is possible to increment by 1V (typ.) the selected voltage value to compensate the excess voltage drop along the coaxial cable (LLC pin HIGH).
In order to reduce the power dissipation of the device when the lowest output voltage is selected, the regulator has two Supply Input pins VCC1 and VCC2. They must be powered respectively at 16V (min) and 23V (min), and an internal switch automatically will select the suitable supply pin according to the selected output voltage. If adequate heatsink is provided and higher power losses are acceptable, both supply pins can be powered by the same 23V source without affecting any other circuit performance. The ENT (Tone Enable) pin activates the internal oscillator so that the DC output is modulated by a ±0.3 V, 22KHz (typ.) square wave. This internal
LNBK20 Maximum Ratings
| Symbol | Parameter | Value | Unit |
| Vi | DC Input Voltage (VCC1, VCC2, MI) | 28 | V |
| Io | Output Current (LNBA, LNBB) | Internally limited | |
| Vi | Logic Input Voltage (ENT, EN, OSEL, VSEL, LLC) | -0.5 to 7 | V |
| ISW | Bypass Switch Current | 900 | mA |
| Ptot | Power Dissipation at Tcase < 85oC | 14 | W |
| Tstg | Storage Temperature Range | - 40 to 150 | |
| Top | Operating Junction Temperature Range | - 40 to 125 |
LNBK20 Connection Diagram
LNBK20
PDF/DataSheet Download
- Datasheet: LNBK20
- File Size: 210705 KB
- Manufacturer: STMICROELECTRONICS [STMicroelectronics]
- Click here to Download
- ·LNBEH21
- STMICROELECTRONICS [STMicroelectronics]
- LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTERFACE
- 602845 KB
- ·LNBEH21PD
- STMICROELECTRONICS [STMicroelectronics]
- LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTERFACE
- 602845 KB
- ·LNBEH21PD-TR
- STMICROELECTRONICS [STMicroelectronics]
- LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTERFACE
- 602845 KB
- ·LNBH2
- STMICROELECTRONICS [STMicroelectronics]
- LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE
- 504861 KB
- ·LNBH21
- STMICROELECTRONICS [STMicroelectronics]
- LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE
- 504861 KB
- ·LNBH21PD
- STMICROELECTRONICS [STMicroelectronics]
- LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE
- 504861 KB
- ·LNBH21PD-TR
- STMICROELECTRONICS [STMicroelectronics]
- LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE
- 504861 KB
- ·LNBH221
- STMICROELECTRONICS [STMicroelectronics]
- DUAL LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE
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