STEVAL-CBL004V1 STMicroelectronics, STEVAL-CBL004V1 Datasheet - Page 5

• Manufacturer Part Number: STEVAL-CBL004V1
• Description: BOARD DEMONSTRATION LNBH PS
• Manufacturer: STMicroelectronics

Specifications of STEVAL-CBL004V1

• Main Purpose: Special Purpose DC/DC, LNB
• Board Type: Fully Populated
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Output: -
• Voltage - Input: -
• Power - Output: -
• Utilized Ic / Part: -
• Frequency - Switching: -
• Outputs And Type: -
• Regulator Topology: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

LNBH24L
2
2.1
Note:
2.2
2.3
2.4
Introduction
The LNBH24L includes two completely independent sections. Unless for the V
inputs, each circuit can be separately controlled and have its independent external
components. All the below specification must be considered equal for both sections (A/B).
Application information (valid for each section A/B)
This IC has a built-in DC-DC step-up converter that, from a single source from 8 V to 15 V,
generates the voltages (V
dissipated power of 0.55 W typ. @ 500 mA load per channel (the linear post-regulator drop
voltage is internally kept at V
disable the whole circuit when the supplied V
typically).
In this document the V
output (V
DiSEqC™ data encoding
The new internal 22 kHz tone generator is factory trimmed in accordance to the standards,
and can be selected by I²C interface TTX bit (or TTX pin) and activated by a dedicated pin
(DSQIN) that allows immediate DiSEqC™ data encoding, or through TEN I²C bit in case the
22 kHz presence is requested in continuous mode. In stand-by condition (EN bit LOW) the
TTX function must be disabled setting TTX to LOW.
DiSEqC™ 1.X implementation by EXTM pin
In order to improve design flexibility and reduce the total application cost, an analogic
modulation input pin is available (EXTM) to generate the 22 kHz tone superimposed to the
V
modulating signal source to the EXTM pin. If the EXTM solution is used the output R-L filter
can be removed (see
cost.The pin EXTM modulates the V
that:
Where V
and EXTM pins while G
DISEQC™ 1.X implementation with V
connection
If an external 22 kHz tone source is not available, it is possible to use the internal 22 kHz
tone generator signal available through the V
oRX
DC output voltage. An appropriate DC blocking capacitor must be used to couple the
oRX
oRX
(AC) and V
pin).
Section 5: Application
OUT
EXTM
EXTM
UP
is intended as the voltage present at the linear post-regulator
) that let the linear post-regulator to work at a minimum
(AC) are, respectively, the peak to peak voltage on the V
UP
is the voltage gain from EXTM to V
Doc ID 16857 Rev 2
V
- V
oRX
OUT
oRX
(
AC
= 1.1 V typ.). An under voltage lockout circuit will
)
voltage through the series decoupling capacitor, so
=
V
EXTM
circuits) saving the external components
oTX
CC
(
drops below a fixed threshold (6.7 V
AC
pin to drive the EXTM pin. By this way the
)
×
G
EXTM
oTX
and EXTM pin
oRX
.
CC
Introduction
and I²C
oRX
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