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LNBH29QTR Datasheet(PDF) 5 Page - STMicroelectronics

Part # LNBH29QTR
Description  LNB supply and control IC with step-up and I짼C interface
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LNBH29QTR Datasheet(HTML) 5 Page - STMicroelectronics

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DocID023065 Rev 3
5/31
LNBH29
Application information
2
Application information
This IC has a built-in DC-DC step-up converter that, from a single source from 9 V to 17.5 V,
generates the voltages (VUP) that allow the linear post-regulator to work with a minimum
dissipated power of 0.5 W typ. @ 500 mA load (the linear post-regulator drop voltage is
internally kept at VUP - VOUT = 1 V typ.). The IC is also provided with an undervoltage
lockout circuit that disables the whole circuit when the supplied VCC drops below a fixed
threshold (4.7 V typically). The step-up converter is provided with a soft-start function which
reduces the inrush current during startup. The SS time is internally fixed at 4 ms typ. to
switch from 0 to 13 V and 6 ms typ. to switch from 0 to 18 V.
2.1
DiSEqC™ data encoding
The LNBH29 series includes two versions with different DiSEqC control pin solutions:
LNBH29 with DSQIN pin and LNBH29E with EXTM pin.
The LNBH29 is provided with the DSQIN logic input pin (TTL compatible) to be controlled by
an external DiSEqC data envelope source which activates the internal 22 kHz tone
generator factory trimmed. This guarantees the tone output waveform in accordance with
the DiSEqC standards.
The LNBH29E is provided with the EXTM analogic modulation input pin to be connected to
an external 22 kHz DiSEqC tone source. The tone output waveform depends on the
characteristics of an external signal injected by means of the EXTM pin.
2.2
LNBH29: data encoding by external DiSEqC envelope control
through the DSQIN pin
If an external DiSEqC code envelope source is available, it is possible to use the internal 22
kHz generator activated during the tone transmission by connecting the DiSEqC envelope
source to the DSQIN pin (see Section 5: Typical application circuits). In this way, the internal
22 kHz signal is superimposed to the VOUT DC voltage to generate the LNB output 22 kHz
tone. During the period in which the DSQIN is kept HIGH, the internal control circuit
activates the 22 kHz tone output.
The 22 kHz tone on the VOUT pin is activated with about 6 µs delay from the DSQIN TTL
signal rising edge, and it stops with a delay time in the range of 15 µs to 60 µs after the 22
kHz TTL signal on DSQIN has expired (refer to Figure 2).
Figure 2. Tone enable and disable timing (using envelope signal)
AM10427v1
~ 6 µs
15 µs ~ 60 µs
DSQIN
Tone
Output


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