STEVAL-LNBH05
Power supply evaluation board for LNB based on the LNBH26S
Data brief
Description
This evaluation board implements a DC-DC
converter based on the LNBH26S device. It is
used to power LNBs inside dish antennas to
receive satellite TV signals.
The LNBH26S is an integrated solution for
supplying and interfacing satellite LNB modules
in accordance with international standards. This
simple and complete solution for dual tuner
satellite receivers offers high performance at low
cost and low external component count.
The LNBH26S evaluation board includes an I²C
bus interface and the internal 22 kHz tone
generator which is factory trimmed and can be
controlled by the DSQIN pin (TTL compatible),
allowing immediate DiSEqC™ data encoding.
Features
Complete interface between LNB and I²C
bus
Built-in DC-DC converter for single 12 V
supply operation and high efficiency (typ.
93% @ 0.5 A)
Selectable output current limit by external
resistor
Compliant with the output voltage
specifications of principal satellite receivers
(15 programmable levels)
Accurate built-in 22 kHz tone generator suits
widely accepted standards
22 kHz tone waveform integrity guaranteed
also at no load condition
Low drop post regulator and high efficiency
step-up PWM with integrated power N-MOS
allowing low power losses
LPM function (low power mode) to reduce
dissipation
Overload and overtemperature internal
protection with I²C diagnostic bits
LNB short-circuit dynamic protection
±4 kV ESD tolerant on output power pins
RoHS compliant
September 2016
Thanks to a fully integrated step-up DC-DC
converter, it functions with a single input voltage
supply source ranging from 8 V to 16 V.
DocID029721 Rev 1
For further information contact your local STMicroelectronics sales
office
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www.st.com
Schematic diagram
1
STEVAL-LNBH05
Schematic diagram
Figure 1: STEVAL-LNBH05 circuit schematic
D2- A
D1- A
C2 - A
C3-A
LNBOUT-A
VOUT- A 20
21 VUP-A
LNBH26S
C5 -A D3-A
TVS-A
3 LX-A
L1- A
R1 (RSEL)
9 ISEL
16 Byp
C7
Vin
12 V
DSQIN- A 22
DSQIN- B 24
ADDR 6
17 Vcc
C4
C1
L1- B
Tone enable control
DiSEqC
22 KHz
DiSEqC
Envelope
TTL
or
TTL
FLT 2
SDA
I2C Bus 8
{ 7 SCL
5 LX-B
D1- B
11 VUP-B
P- GND
C2- B C3-B
4
VOUT -B 12
A -GND
C5-B
D2-B
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LNBOUT-B
15
DocID029721 Rev 1
D3-B
TVS-B
GSPG0809161555SG
STEVAL-LNBH05
2
Revision history
Revision history
Table 1: Document revision history
Date
Version
19-Sep-2016
1
Changes
Initial release.
DocID029721 Rev 1
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STEVAL-LNBH05
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DocID029721 Rev 1
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