SGS Thomson Microelectronics LNBK20PD, LNBK20PD-TR, LNBK16SP-TR, LNBK15SP-TR, LNBK14SP-TR Datasheet
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1/20July 2003
■ COMPLETE INTERFACE FOR TWO LNBs
REMOTE SUPPLY AND CONTROL
■ LNB SELECTION AND STAND-BY
FUNCTION
■ BUILT-IN TONE OSCILLATOR FACTORY
TRIMMED AT 22KHz
■ FAST OSCILLATORSTART-UPFACILITATES
DiSEqC
ENCODING
■ TWO SUPPLY INPUTS FOR LOWEST
DISSIPATION
■ BYPASS FUNCTION FOR SLAVE
OPERATION
■ LNB SHORT CIRCUIT PROTECTION AND
DIAGNOSTIC
■ AUXILIARY MODULATIO N INPUT EXTENDS
FLEXIBILITY
■ CABLE LENGTH COMPENSATION
■ INTERNAL OVER TEMPERATURE
PROTECTION
■ BACKWARD CURRENT PROTECTION
DESCRIPTION
Intended for analog and digital satellite receivers,
the LNBK is a monolithic linear voltage regulator,
assembled in Multiwatt-15, PowerSO-20 and
PowerSO-10, specifically designed to provide the
powering voltages and the interfacing signals to
the LNB downconverter situated in the antenna
via the coax ial cable. It has the s ame functionality
of the LNBP1X and LNBP20 series, at a reduced
output current capability. Since most satel lite
receivers have two antenna ports, the output
voltage of the regulator is available at one of two
logic-selectable output pins (LNBA, LNBB). When
the IC is powered and put in Stand-by (EN pin
LOW), both regulator outputs are disabled to allow
the antenna downconverters to be supplied/
controlled by others satellite receivers sharing the
same coaxial lines. In this occurrence the device
will limit at 3 mA (max) the backward current that
could flow from LNBA and LNBB output pins to
GND.
For slave operation in single dish, dual receiver
systems, the bypass function is implemented by
an electronic switch between the Master Input pin
(MI) and the LNBA pin , thus leaving all LNB
powering and control functions to t he Master
Receiver. This electronic switch is close d when
the device is powered and EN pin is LOW.
The regulator outputs c an be logic controlled to be
13 or 18 V (typ.) by mean of the VSEL pin for
remote controlling of LNBs. A dditionally, it is
possible to increment by 1V (typ.) the selected
voltage value to compensate the excess voltage
drop along th e coax ial c able (LLC pin H IG H).
In orde r to reduc e the power dissipation of the
device when the lowes t output voltage is selected,
the regulator has two Suppl y Input pi ns V
CC1
and
V
CC2
. They must be powered respec ti v ely at 16V
(min) and 23V (min), and an internal switch
automatically will select the suitable supply pin
according to the selected output voltage. If
adequate heatsink is provided a nd higher power
losses are ac ceptable, both supply pins can be
powered by the same 23V source without
affecting any other circuit performance.
The ENT (T one Enable) pin activates the internal
oscillator so that the DC output is modulated by a
±0.3 V , 22KHz (typ.) square wave. This internal
oscillator is f ac to ry trimmed within a tolerance of
±2KHz, thus no further adjustments neither
external components are required.
A burst coding of the 22KHz tone can be
accomplished thanks to the fast response of the
ENT i nput and the prompt oscillator start-up. This
helps designers who want to implement t he
DiSEqC
protocols (*).
LNBK10 SERIES
LNBK20
LNB SUPPLY AND CONTROL VOLTAGE
REGULATOR (PARALLEL INTERFACE)
PowerSO-10
1
10
PowerSO-20
Multiwatt-15
LNBK10 SERIES - LNBK20
2/20
In order to improve design flexibility and to allow
implementation of newcoming LNB remote control
standards, an analogic modulation
input pin is available (EXTM). An appropriate DC
blocking capacitor must be used to couple the
modulating signal source t o the EXTM pin. When
external modulation is not used, the relevant pin
can be left open.
Two pins are dedicated to the overcurrent
protection/monitoring: CEXT and OLF. T he
overcurrent protection circuit works dynamically:
as soon as an overloa d is detected in either LNB
output, the out put is shut-down for a tim e Toff
determined by t he capacitor connected between
CEXT and GND. Simultaneously the OLF pin, that
is an open collector diagnostic output flag, from
HIGH IMPEDANCE state goes LOW.
After t he time has elapsed, the output is resumed
for a time t
on
=1/15t
off
(typ.) and OLF goes in HIGH
IMPEDANCE. If the overload is still present, the
protection circuit will cycle again through t
off
and
ton until the overload is removed. T yp ical t
on+toff
value is 1200ms when a 4.7µF external c apac it or
is used.
This dynamic operation can greatly reduce the
power dissipation in short circuit condition, still
ensuring excellent power-on start up even with
highly capacitive loads on LNB outputs.
The device is packaged in Multiwatt15 for
thru-holes mounting and in PowerSO-20 for
surface mounting. When a limited functionality in a
smaller package matches design needs, a range
of cost-effective PowerSO-10 solutions is also
offered. All versions have built-in thermal
protection agains t overheating damage.
(*): External components are needed to comply to level 2.x and above (bidirectional) DiSEqCbus hardware requirements. DiSEqCis a
trademark or EUTELSAT.
ORDERING CODES
(*) Available on request
PIN CONFIGUARATION (top v iew)
TYPE Multiwatt-15 PowerSO-20 PowerSO-10
LNBK10 LNBK10SP-TR (*)
LNBK11 LNBK11SP-TR (*)
LNBK12 LNBK12SP-TR (*)
LNBK13 LNBK13SP-TR (*)
LNBK14 LNBK14SP-TR (*)
LNBK15 LNBK15SP-TR (*)
LNBK16 LNBKP16SP-R (*)
LNBK20 LNBK20CR LNBK20PD-TR
PowerSo-20 PowerSO-10Multiwatt-15
LNBK10 SERIES - LNBK20
3/20
TABLE A: PIN CONFIGURATIONS
NOTE: the limited pin availability of the PowerSO-10 package leads t o drop some functions.
SYMBOL NAME FUNCTION
PIN NUMBER vs SALES TYPE (LNBK)
20CR 20PD 10SP 11SP 12SP 13SP 14SP 15SP 16SP
V
CC1
Supply Input 1 15V to 27V supply. It is
automatically selected
when V
OUT
=13or14V
12111 111
V
CC2
Supply Input 2 22V to 27V supply. It is
automatically selected
when V
OUT
=18or19V
232222222
LNBA Output Port See truth table voltage
and port selection. In
stand-by mode this port
is powered by the MI pin
via the internal Bypass
Switch
343333333
V
SEL
Output Voltage
Selection:13 or
18V (typ)
Logic control input: see
truth table
454444444
EN Port Enable Logic control input: see
truth table
565555555
OSEL Port Selection Logic control input: see
truth table
7 7 9 NA NA NA NA NA NA
GND Ground Circuit Ground. It is
internally connected to
the die frame
81
10
11
20
66 6666
ENT 22KHz Tone
Enable
Logic control input: see
truth table
9137777777
CEXT External
Capacitor
Timing Capacitor used
by the Dynamic
Overload protection.
Typical application is
4.7µF for a 1200ms
cycle
10148888888
EXTM External
Modulator
External Modulation
Input. Needs DC
decoupling to the AC
source. if not used, can
be left open.
11 15 NA NA NA 9 NA 9 9
LLC Line Length
Compens.
(1V typ)
Logic control input: see
truth table
12 16 NA NA 9 NA 9 NA 10
OLF Over Load
Flag
Logic output (open
collector). Normally in
HIGH IMPEDANCE,
goes LOW when current
or thermal overload
occurs
13 17 NA 9 NA NA 10 10 NA
MI Master Input In stand-by mode, the
voltage on MI is routed
to LNBA pin. Can be left
open if bypass function
is not needed
14 18 NA 10 10 10 NA NA NA
LNBB Output Port See truth tables for
voltage and port
selection
15 19 10 NA NA NA NA NA NA
LNBK10 SERIES - LNBK20
4/20
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
LOGIC CONTROLS TRUTH TABL E
NOTE: All logic input pins have internal pull-down resistor (typ. = 250KΩ)
Symbol Parameter² Value Unit
V
I
DC Input Voltage (V
CC1,VCC2
, MI)
28 V
I
O
Output Current (LNBA, LNBB)
Internally Limited mA
V
I
Logic Input Voltage (ENT, EN OSEL, VSEL, LLC)
-0.5 to 7 V
I
SW
Bypass Switch Current
900 mA
P
D
Power Dissipation at T
case
< 85°C
14 W
T
stg
Storage Temperature Range
-40 to +150 °C
T
op
Operating Junction Temperature Range
-40 to +125 °C
Symbol Parameter Value Unit
R
thj-case
Thermal Resistance Junction-case
2 °C/W
CONTROL I/O PIN NAME L H
OUT OLF I
OUT>IOMAX
or Tj>150°C I
OUT<IOMAX
IN ENT 22KHz tone OFF 22KHz tone ON
IN EN See Table Below See Table Below
IN OSEL See Table Below See Table Below
IN VSEL See Table Below See Table Below
IN LLC See Table Below See Table Below
EN OSEL VSEL LLCO
V
LNBA
V
LNBB
LXXXV
MI
- 0.4V (typ.) Disabled
H L L L 13V (typ.) Disabled
H L H L 18V (typ.) Disabled
H L L H 14V (typ.) Disabled
H L H H 19V (typ.) Disabled
H H L L Disabled 13V (typ.)
H H H L Disabled 18V (typ.)
H H L H Disabled 14V (typ.)
HHHH Disabled 19V (typ.)
LNBK10 SERIES - LNBK20
5/20
BLOCK DIAGRAM
LNBK10 SERIES - LNBK20
6/20
ELECTRICAL CHARACTERISTICS FOR LNBK SERIES (TJ= 0 to 85°C, CI=0.22µF, CO=0.1µF,
EN=H,ENT=L,LLC=L,V
IN1
=16V, V
IN2
=23V I
OUT
=50mA, unless otherwise specified.)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
IN1
V
CC1
Supply Voltage IO= 400 mA ENT=H, VSEL=L, LLC=L 15 27 V
I
O
= 400 mA ENT=H, VSEL=L, LLC=H 16 27 V
V
IN2
V
CC2
Supply Voltage IO= 400 mA ENT=H, VSEL=L, LLC=L 22 27 V
I
O
= 400 mA VSEL=L, LLC=H 23 27 V
V
O1
Output Voltage IO= 400 mA VSEL=L, LLC=L 17.3 18 18.7 V
I
O
= 400 mA ENT=H, VSEL=L, LLC=H 19 V
V
O2
Output Voltage IO= 400 mA VSEL=L, LLC=L 12.5 13 13.5 V
I
O
= 400 mA ENT=H, VSEL=L, LLC=H 14 V
∆V
O
Line Regulation V
IN1
=15 to 18V V
OUT
=13V 5 50 mV
V
IN2
=22 to 25V V
OUT
=18V 5 50 mV
∆V
O
Load Regulation V
IN1=VIN2
=22V V
OUT
=13 or 18V
I
O
=0to3A
65 150 mV
SVR Supply Voltage Rejection V
IN1=VIN2
=23± 0.5Vacfac= 120 Hz, 45 dB
I
MAX
Output Current Limiting 500 650 800 mA
t
OFF
Dynamic Overload
protection OFF Time
Output Shorted C
EXT
=4.7µF 1100 ms
t
ON
Dynamic Overload
protection ON Time
Output Shorted C
EXT
=4.7µFt
OFF
/15 ms
f
TONE
Tone Frequency ENT=H 20 22 24 KHz
A
TONE
Tone Amplitude ENT=H 0.55 0.72 0.9 Vpp
D
TONE
Tone Duty Cycle ENT=H 40 50 60 %
t
r,tf
Tone Rise and Fall Time ENT=H 5 10 15 µs
G
EXTM
External Modulation Gain ∆V
OUT
/∆V
EXTM
, f = 10Hz to 40KHz 5
V
EXTM
External Modulation Input
Voltage
AC Coupling 400 mVpp
Z
EXTM
External Modulation
Impedance
f = 10Hz to 40KHz 400 Ω
V
SW
Bypass Switch Voltage
Drop (MI to LNBA)
EN=L, ISW=300mA, V
CC2-VMI
=4V 0.35 0.6 V
V
OL
Overload Flag Pin Logic
LOW
IOL=8mA 0.28 0.5 V
I
OZ
Overload Flag Pin OFF
State Leakage Current
VOH=6V 10 µA
V
IL
Control Input Pin Logic
LOW
0.8 V
V
IH
Control Input Pin Logic
HIGH
2.5 V
I
IH
Control Pins Input Current VIH=5V 20 µA
I
CC
Supply Current Output Disabled (EN=L) 0.3 1 mA
ENT=H, I
OUT
=500mA 3.1 6 mA
I
OBK
Output Backward Current EN=L V
LNBA=VLNBB
= 18V
V
IN1=VIN2
= 22V or floating
0.23mA
T
SHDN
Temperature Shutdown
Threshold
150 °C
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