LNBH24PPR STMicroelectronics, LNBH24PPR Datasheet - Page 5

• Manufacturer Part Number: LNBH24PPR
• Description: IC LNB SUPPLY/CTRL DUAL PWRSSO36
• Manufacturer: STMicroelectronics

Specifications of LNBH24PPR

• Applications: Converter, Analog and Digital Satellite STB Receivers/SatTV
• Voltage - Input: 8 ~ 15 V
• Number Of Outputs: 2
• Voltage - Output: 13.4V, 18.5V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: PowerSO-36 Exposed Bottom Pad
• Output Voltage: 19.5 V
• Output Current: 750 mA
• Input Voltage: 8 V to 15 V
• Switching Frequency: 220 KHz
• Operating Temperature Range: - 25 C to + 125 C
• Mounting Style: SMD/SMT
• For Use With: 497-8718 - DEMO BOARD BASED ON LNBH24LNBH24DEMOBOARD - DEMO BOARD FOR LNBH24
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6882-2; LNBH24PPR

2
2.1
Note:
2.2
2.3
2.4
Introduction
The LNBH24 includes two completely independent sections. Except for the V
inputs, each circuit can be separately controlled and have independent external
components. The specification that follow should be considered equally for both sections
(A/B).
Application information
This IC has a built-in DC-DC step-up converter which, from a single 8 V to 15 V source,
generates the voltages (V
dissipated power of 0.375 W Typ. @ 500 mA load (the linear post-regulator drop voltage is
internally held at V
entire circuit when the supplied V
In this document the V
output (V
DiSEqC™ data encoding and decoding
The new internal 22 kHz tone generator (patent pending) is factory trimmed in accordance
with the standards, and can be selected through I²C interface TTX bit (or TTX pin) and
activated by a dedicated pin (DSQIN) which allows immediate DiSEqC™ data encoding, or
through TEN I²C bit in case the 22 kHz presence is requested in continuous mode. In
standby condition (EN bit LOW). The TTX function must be disabled setting TTX to LOW.
DiSEqC™ 2.0 implementation
The built-in 22 kHz Tone detector completes the fully bi-directional DiSEqC™ 2.0 (see
Note:) interfacing. Its input pin (DETIN) must be AC coupled to the DiSEqC™ bus, and
extracted PWK data are available on the DSQOUT pin. To comply with the bi-directional
DiSEqC™ 2.0 bus hardware requirements an output R-L filter is needed. The LNBH24 is
provided with two output pins for each section, one for the DC voltage output (V
for the 22 kHz tone transmission (V
transmission while the V
Tone to pass without any losses due to the R-L filter impedance (see
22 kHz transmission, in DiSEqC™ 2.0 applications, activated by DSQIN pin or by the TEN
bit, the V
both through the TTX pin and the I²C bit. As soon as the tone transmission is expired, the
V
mode. The 13/18 V power supply is always provided to the LNB from the V
the R-L filter.
DiSEqC™ 1.X implementation
When the LNBH24 is used in DiSEqC™ 1.x applications the R-L filter is always needed for
the proper operation of the 22 kHz tone generator (patent pending. See
this case, the TTX function must be preventively enabled before to start the 22 kHz data
transmission and disabled as soon as the data transmission has been expired. The tone can
oTX
must be disabled by setting the TTX to LOW to set the device in the 22 kHz receiving
oTX
oRX
pin must be preventively set ON by the TTX function. This can be controlled
pin).
UP
-V
OUT
OUT
oRX
UP
is intended as the voltage present at the linear post-regulator
=0.75 V typ.). An under voltage lockout circuit will disable the
) that allow the linear post-regulator to work at a minimum
provides the 13/18 V output voltage. This allows the 22 kHz
CC
oTX
drops below a fixed threshold (6.7 V typically).
). The V
oTX
must be activated only during the tone
Figure
Figure
oRX
4). During the
CC
oRX
pin through
4). Also in
and I²C
) and one
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