STMicroelectronics STEVAL-LNBH01

Overview

STEVAL-LNBH01 from STMicroelectronics is an evaluation board for satellite low-noise block downconverter (LNB) power supply based on the LNBH25LS IC. It provides complete I²C-controlled DC-DC conversion, 22 kHz tone generation, and LNB short-circuit protection, operating from a single 8–16 V input to deliver programmable 13/18 V output with up to 0.5 A current for dual-tuner satellite receivers.

For engineers reviewing the STEVAL-LNBH01 datasheet, STEVAL-LNBH01 pinout, STEVAL-LNBH01 application, or STEVAL-LNBH01 equivalent, this board enables rapid validation of LNB power interface compliance with DiSEqC™ standards, 22 kHz tone integrity under no-load conditions, and I²C diagnostic feedback for overload/overtemperature events.

Technical Context

The STEVAL-LNBH01 implements a high-efficiency step-up PWM converter with integrated N-MOSFET and low-drop post-regulator, achieving 93% typical efficiency at 0.5 A load. Its LNBH25LS core integrates factory-trimmed 22 kHz tone generation, selectable output current limiting via external resistor, and 15-level programmable output voltage (13 V / 18 V).

Internal protections include dynamic LNB short-circuit response, ±4 kV ESD tolerance on power pins, LPM (low-power mode) for thermal management, and I²C-accessible diagnostic bits for overload and overtemperature detection-enabling real-time system monitoring in satellite receiver front-ends.

Key Specifications

Availability

STEVAL-LNBH01 is available at Aetrix Electronics and suitable for satellite TV receiver development, DiSEqC™-compliant LNB power interface validation, and dual-tuner front-end design requiring stable component supply and traceable evaluation hardware.

Supply support for STEVAL-LNBH01 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power management devices, and sensor solutions for industrial, automotive, and consumer applications.

The STEVAL-LNBH01 belongs to ST's satellite receiver evaluation platform family, engineered specifically to accelerate time-to-market for compliant LNB power subsystems in set-top boxes and integrated satellite tuners.

FAQ

What is the primary function of the STEVAL-LNBH01 evaluation board?

The STEVAL-LNBH01 is a dedicated evaluation platform for the LNBH25LS IC, enabling engineers to validate full LNB power delivery-including programmable 13/18 V output, 22 kHz tone generation, I²C control, and short-circuit protection-in satellite TV receiver designs. It is not a production power module but a reference implementation with documented schematics and layout.

Does the board support DiSEqC™ communication?

Yes-the STEVAL-LNBH01 supports DiSEqC™ through its integrated 22 kHz tone generator and DSQIN pin (TTL-compatible), allowing direct encoding of DiSEqC™ commands. The tone waveform is factory-trimmed and maintains integrity even under no-load conditions, ensuring reliable signal switching between satellite positions.

Can the output current limit be adjusted?

Yes-the board allows selectable output current limit via an external resistor connected to the ILIM pin of the LNBH25LS. This enables precise tuning of overcurrent protection thresholds for different LNB loads, supporting both single and dual-LNB configurations without hardware redesign.

What protection features are implemented on the board?

The STEVAL-LNBH01 incorporates internal overload and overtemperature protection with I²C-readable diagnostic bits, dynamic LNB short-circuit response, ±4 kV ESD tolerance on output power pins, and low-power mode (LPM) to reduce thermal dissipation during standby-critical for reliability in unventilated outdoor antenna enclosures.