STMicroelectronics STEVAL-LNBH05

Overview

STEVAL-LNBH05 from STMicroelectronics is an evaluation board for powering satellite low-noise block downconverters (LNBs), built around the LNBH26S IC. It provides I²C-controlled 13/18 V DC output, programmable 22 kHz tone generation, DiSEqC™ envelope encoding via DSQIN pins, and operates from a single 8–16 V input with 93% typical efficiency at 0.5 A.

For engineers reviewing the STEVAL-LNBH05 datasheet, STEVAL-LNBH05 pinout, STEVAL-LNBH05 application, or STEVAL-LNBH05 equivalent, key selection considerations include dual-LNB support, I²C register mapping for voltage/tone control, DiSEqC™ timing compliance, and thermal protection behavior under short-circuit conditions.

Technical Context

The board implements a fully integrated step-up DC-DC converter using the LNBH26S, featuring internal N-MOSFET switching, low-drop post-regulation, and selectable current limiting via external resistors. Output voltage is programmable across 15 levels (13 V / 18 V nominal) to meet satellite receiver standards.

It integrates factory-trimmed 22 kHz tone generation with waveform integrity maintained even at no load, plus LPM (low power mode) for reduced dissipation. Protection includes overload detection, overtemperature shutdown, LNB short-circuit dynamic response, and ±4 kV ESD tolerance on power output pins.

Key Specifications

Availability

STEVAL-LNBH05 is available at Aetrix Electronics and suitable for satellite TV receiver development, dual-LNB antenna systems, DiSEqC™-enabled set-top box validation, and broadcast infrastructure prototyping requiring stable component supply and full functional evaluation capability.

Supply support for STEVAL-LNBH05 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, designing and manufacturing analog, MCU, power, and sensor solutions for automotive, industrial, and consumer applications.

The STEVAL-LNBH05 belongs to ST's power supply evaluation board family, developed specifically to accelerate design-in of LNB power interfaces compliant with ETSI EN 301 427 and DiSEqC™ 1.x standards.

FAQ

What is the primary function of the STEVAL-LNBH05 evaluation board?

The STEVAL-LNBH05 is a complete hardware platform for evaluating the LNBH26S IC, enabling rapid validation of dual-LNB power delivery, 22 kHz tone generation, and DiSEqC™ envelope encoding in satellite TV signal reception systems. It requires no additional power stage components and supports full I²C register access for configuration and diagnostics.

Does the board support both single and dual LNB configurations?

Yes - the STEVAL-LNBH05 implements two independent LNB power channels (A and B), each with dedicated LX, LNBOUT, VUP, DSQIN, and FLT pins. Schematic Figure 1 confirms separate inductors (L1-A/L1-B), diodes (D1-A/D1-B), and TVS devices (TVS-A/TVS-B), enabling simultaneous operation and independent control of two LNBs.

How is the 22 kHz tone generated and controlled?

The 22 kHz tone is generated internally by the LNBH26S with factory-trimmed accuracy and delivered directly to the LNBOUT pins. It can be enabled/disabled per channel via I²C register bits or TTL-level signals applied to DSQIN-A/DSQIN-B, supporting both continuous tone and DiSEqC™ burst-mode operation without external oscillator circuitry.

What protection features are implemented on this board?

The board incorporates overload and overtemperature detection with I²C-readable status bits, dynamic short-circuit protection for LNB outputs, and ±4 kV HBM ESD protection on LNBOUT pins. The LNBH26S also includes internal LPM (low power mode) activation to reduce dissipation during standby, and fault reporting via the FLT pin per channel.