STEVAL-LNBH02

The STEVAL-LNBH02 is a power supply evaluation board for LNB based on the LNBH25S. This evaluation board implements a DC-DC converter based on the LNBH25S device. It is used to power LNBs inside dish antennas to receive satellite TV signals. The LNBH25S is an integrated solution for supplying / interfacing satellite LNB modules in accordance with international standards. It is a simple and complete solution for dual tuner satellite receivers and provides high performance at low cost with a low external component count. The LNBH25S evaluation board includes an I?C bus interface and an internal 22KHz tone generator which is factory trimmed and can be controlled by the DSQIN pin (TTL compatible) allowing immediate DiSEqC data encoding.

• Complete interface between LNB and I?C bus
• Built-in DC-DC converter for single 12V supply operation and high efficiency (typ. 93% at 0.5A)
• Selectable output current limit by external resistor
• Compliant with main satellite receivers output voltage specification (15 programmable levels)
• Accurate built-in 22KHz tone generator suits widely accepted standards
• 22KHz tone waveform integrity guaranteed also at no load condition
• Low drop post regulator, high efficiency step-up PWM with integrated power N-MOS for low power loss
• LPM function (low power mode) to reduce dissipation
• Overload and overtemperature internal protection with I?C diagnostic bits
• LNB short-circuit dynamic protection, ±4KV ESD tolerant on output power pins