LNBH23PPR STMicroelectronics, LNBH23PPR Datasheet - Page 5

• Manufacturer Part Number: LNBH23PPR
• Description: IC LNB SUPPLY/CTRL POWERSSO-24
• Manufacturer: STMicroelectronics

Specifications of LNBH23PPR

• Applications: Converter, Analog and Digital STB Receivers/SatTV
• Voltage - Input: 8 ~ 15 V
• Number Of Outputs: 1
• Voltage - Output: 13.4V, 18.5V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: PowerSSO-24
• Output Voltage: 25 V
• Output Current: 1000 mA
• Input Voltage: 8 V to 15 V
• Switching Frequency: 220 KHz
• Operating Temperature Range: - 25 C to + 125 C
• Mounting Style: Through Hole
• Duty Cycle (max): 57 %
• For Use With: 497-8717 - DEMO BOARD BASED ON LNBH23497-8336 - BOARD EVAL BASED ON LNBH23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6121-2

LNBH23
2
Note:
2.1
2.2
2.3
Application information
This IC has a built-in DC-DC step-up converter with integrated NMOS that, from a single
source from 8 V to 15 V, generates the voltages (V
work at a minimum dissipated power of 0.375 W Typ. @ 500 mA load (the linear post-
regulator drop voltage is internally kept at V
circuit will disable the whole circuit when the supplied V
V typically).
In this document the output voltage (V
post-regulator output (V
DiSEqC™ data encoding and decoding
The new internal 22 kHz tone generator (patent pending) 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™ 2.0 implementation
The built-in 22 kHz tone detector completes the fully bi-directional DiSEqC™ 2.0 interfacing
(see
extracted PWK data are available on the DSQOUT pin. To comply to the bi-directional
DiSEqC™ 2.0 bus hardware requirements an output R-L filter is needed. The LNBH23 is
provided with two output pins, one for the dc voltage output (V
tone transmission (V
while the V
without any losses due to the R-L filter impedance (see
During the 22 kHz transmission, in DiSEqC™ 2.0 applications, activated by DSQIN pin or by
the TEN bit, the V
controlled both through the TTX pin and by I²C bit. As soon as the tone transmission is
expired, the V
kHz receiving mode. The 13/18 V power supply is always provided to the LNB from the V
pin through the R-L filter.
DiSEqC™ 1.X implementation
When the LNBH23 is used in DiSEqC™ 1.x applications the R-L filter is always needed for
the proper operation of the new 22 kHz tone generator (patent pending. See application
circuit). Also in 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 be activated both with the DSQIN pin or the TEN I²C bit. The DSQIN internal
circuit activates the 22 kHz tone on the V
TTL signal presence on the DSQIN pin, and it stops with 1 cycles ±25 µs delay after the TTL
signal is expired.
Note
1). It’s input pin (DETIN) must be AC coupled to the DiSEqC™ BUS, and
oRX
oTX
provides the 13/18 V output voltage. This allows the 22 kHz Tone to pass
oTX
must be disabled by setting the TTX to LOW to set the device in the 22
oTX
pin must be preventively set ON by the TTX function. This can be
ORX
). The V
pin).
Doc ID 13356 Rev 7
oTX
must be activated only during the tone transmission
O
) is intended as the voltage present at the linear
oTX
UP
output with 0.5 cycles ±25 µs delay from the
-V
ORX
UP
=0.75 V typ.). An under voltage lockout
) that let the linear post-regulator to
CC
Figure 4
drops below a fixed threshold (6.7
oRX
typ. application circuit).
) and one for the 22 kHz
Application information
oRX
5/32