SGS Thomson Microelectronics LNBK20PD, LNBK20CR, LNBK16SP, LNBK15SP, LNBK14SP Datasheet

LNBK10 SERIES



LNB SUPPLY AND CONTROLVOLTAGE

REGULATOR (PARALLEL INTERFACE)

■ REDUCED OUTPUT CURRENT VERSION

OF LNBP1X AND LNBP20SERIES

■ COMPLETEINTERFACE FOR TWOLNBs

REMOTE SUPPLYANDCONTROL

■ LNB SELECTIONAND STAND-BYFUNCTION

■ BUILT-INTONEOSCILLATORFACTORY

TRIMMEDAT22KHz

■ FASTOSCILLATORSTART-UP

FACILITATESDiSEqC ENCODING

■ TWOSUPPLY INPUTSFOR LOWEST

DISSIPATION

■ BYPASSFUNCTIONFOR SLAVE

OPERATION

■ LNB SHORTCIRCUIT PROTECTIONAND

DIAGNOSTIC

■ AUXILIARYMODULATIONINPUTEXTENDS

FLEXIBILITY

■ CABLELENGTHCOMPENSATION

■ INTERNALOVERTEMPERATURE

PROTECTION

■ BACKWARDCURRENT 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 coaxial cable.It has thesamefunctionality
of the LNBP1X and LNBP20 series, at a reduced
output current capability. Since most satellite
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 samecoaxial 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 theMaster Input pin

LNBK20

Multiwatt-15

10

1

PowerSo-20 PowerSO-10

(MI) and the LNBA pin, thus leaving all LNB
powering and control functions to the Master
Receiver. This electronic switch is closed when
the device is powered and EN pin is LOW.

The regulator outputs can be logic controlled to
be 13 or 18 V (typ.) by mean of the VSEL pin for
remote controlling of LNBs. Additionally, it is
possible to increment by 1V (typ.) the selected
voltage value to compensate the excess voltage
drop along the coaxial cable (LLC pinHIGH).

In order to reduce the power dissipation of the
device when the lowest output voltage is
selected, the regulator has two Supply Input pins

CC1

and V

V
respectively 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
and higher power losses are acceptable, both
supply pins can be powered by the same 23V
source without affecting any other circuit
performance.

The ENT (Tone Enable) pin activates the internal
oscillatorso that the DC output is modulatedby a
±0.3 V, 22KHz (typ.) square wave. This internal

. They must be powered

CC2

September 1998

1/18

LNBK10 SERIES - LNBK20

oscillator is factory trimmed within a tolerance of
±2KHz, thus no further adjustments neither
external componentsare required.
A burst coding of the 22KHz tone can be

accomplished thanks to the fast response of the
ENT input and the prompt oscillator start-up. This
helps designers who want to implement the
DiSEqC protocols(*).

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
modulatingsignal source to the EXTMpin. When
external modulation is not used, the relevant pin
canbe leftopen.

Two pins are dedicated to the overcurrent
protection/monitoring: CEXT and OLF. The
overcurrent protection circuit works dynamically:
as soon as an overload is detected in eitherLNB
output, the output is shut-down for a time Toff

CEXT and GND. Simultaneously the OLF pin,
that is an open collector diagnostic output flag,
from HIGH IMPEDANCE state goes LOW. After
the time has elapsed,the output is resumedfor a
time t

=1/15t

on

(typ.) and OLF goes in HIGH

off

IMPEDANCE. If the overload is still present, the
protection circuit will cycle again through t

until the overload is removed. Typical ton+t

t

on

off

and

value is 1200ms when a 4.7µF externalcapacitor
is used.

This dynamic operation can greatly reduce the
power dissipation in short circuit condition, still
ensuring excellent power-on start up even with
highlycapacitiveloads 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
protectionagainst overheatingdamage.

determined by the capacitor connected between

(*): External components are needed to comply to level 2.x and above (bidirectional) DiSEqC bus hardware requirements. DiSEqC is
a trademark of EUTELSAT.

off

ORDERING NUMBERS

Type Multiwatt-15 PowerSO-20 PowerSO-10

LNBK10
LNBK11
LNBK12
LNBK13
LNBK14
LNBK15
LNBK16
LNBK20 LNBK20CR (*) LNBK20PD

(*) Available onrequest

PINCONFIGURATIONS

LNBK10SP (*)
LNBK11SP (*)
LNBK12SP (*)
LNBK13SP (*)
LNBK14SP (*)
LNBK15SP (*)
LNBK16SP (*)

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Multiwatt-15 PowerSO-20 PowerSO-10

LNBK10 SERIES - LNBK20

TABLEA: PIN CONFIGURATIONS

SYMBOL NAME FUNCTION PIN NUMBER vs SALES TYPE (LNBK)

20CR 20PD 10SP 11SP 12SP 13SP 14SP 15SP 16SP

V

CC1

Supply Input 1 15V to27Vsupply. It is

121111111

automatically selected

=13or14V

OUT

232222222

V

CC2

whenV

Supply Input 2 22V to27Vsupply. It is

automatically selected
whenV

LNBA Output Port Seetruth tables for voltage

=18or19V

OUT

343333333
and port selection. In
stand-bymode this port is
poweredby the MI pinvia
theinternal Bypass Switch

VSEL Output Voltage

Selection: 13 or

Logic control input: See
truthtable

454444444

18V (ty p)

EN Port Enable Logiccontrolinput: See

565555555
truthtable

OSEL Port Selection Logic control input: See

7 7 9 NANANANANANA
truthtable

GND Gr ound Circuit Ground.Itis

internally connected tothe
dieframe

81

10
11
20

ENT 22 KHz Tone

Enable

CEXT External Capacitor Timing capacitor used by

Logic control input: See
truthtable

9137777777

10148888888
theDynamicOverload
Protection.Typical
application is4.7 µFfora
1200ms cycle

EXTM External

Modulat i on

ExternalModulation Input.
Needs DC decoupling to

11 15 NA NA NA 9 NA 9 9
theAC source. If notused,

canbe leftopen.

LLC Line L engt h

Compens (+ 1V ty p)

OLF O ver Load F lag Logic output (open

Logic control input: See
truthtable

12 16 NA NA 9 NA 9 NA 10

13 17 NA 9 NA NA 10 10 NA
Collector). Normally in
HIGH IMPEDANCE,goes
LOW when current or
thermal overload occurs.

MI Master Input In stand-by mode, the

14 18 NA 10 10 10 NA NA NA
voltage onMI is routed to
LNBApin. Canbe left
openif bypass functionis
notneeded

LNBB Output Port Seetruth tables for voltage

15 19 10 NA NA NA NA NA NA
and port selection.

NOTE: The limited pin availability of thePowerSO-10 package leads todrop some functions.

6666666

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LNBK10 SERIES - LNBK20

ABSOLUTE MAXIMUMRATING

Symbol Parameter Value Unit

V

DC InputVoltage(VCC1,VCC2,MI) 28 V

i

OutputCurrent (LNBA, LNBB) Internally limited

I

o

Logic InputVoltage (ENT, EN,OSEL, VSEL,LLC) -0.5 to 7 V

V

i

BypassSwitchCurrent 900 mA

I

SW

Power Dissipation at T

P

tot

StorageTemperature Range - 40 to 150

T

stg

Operating JunctionTemperature Range - 40 to 125

T

op

Absolute Maximum Ratingsare those values beyondwhich damage to the devicemay occur. Functional operation under these conditions
is not implied

THERMAL DATA

Symbol Parameter Value Unit

R

thj-case

Thermal ResistanceJunction-case 2

LOGICCONTROLS TRUTH TABLES

Control I/O Pin Name L H

OUT OLF I

IN ENT 22KHz tone OFF 22KHz t o ne ON
IN EN See table below See table below
IN OS EL See table below See table below
IN V S EL See ta ble below See table below
IN LLC See table below See table below

<85oC14W

case

OUT>IOMAX

or Tj>150OCI

OUT<IOMAX

o
o

o

C/W

C
C

EN OSEL VSEL LLCP V

LXXX V

LNBA

-0.4V (typ.) Disabled

MI

H L L L 13V (typ. ) Disabled
H L H L 18V (t yp.) Disabled
H L L H 14V (ty p. ) Disabled
H L H H 19V (typ. ) Disabled
H H L L Disable d 13V (t yp . )
H H H L Disable d 18V (t yp . )
H H L H D is able d 14V (typ. )
H H H H Disabled 19V ( t yp.)

NOTE: All logicinput pins have internal pull-down resistor (typ. = 250KΩ)

V

LNBB

4/18

BLOCK DIAGRAM

LNBK10 SERIES - LNBK20

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LNBK10 SERIES - LNBK20

ELECTRICAL CHARACTERISTICS FOR LNBKSERIES (Tj= 0 to 85oC, Ci=0.22 µF, Co=0.1 µF,

EN=H,ENT=L, LLC=L, V

=16V,V

IN1

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

IN1VCC1

V

IN2VCC2

V

O1

V

O2

∆V

O

∆V

O

SupplyVoltage IO=400mA, ENT=H, VSEL=L, LLC=L

SupplyVoltage IO=400mA, ENT=VSEL=H, LLC=L

OutputVoltage IO=400 mA, VSEL=H, LLC=L

OutputVoltage IO=400 mA, VSEL=L, LLC=L

LineRegulation V

LoadRegulation V

SVR Supply VoltageRejection

I
t

OutputCurrent Limiting 400 500 600 mA

MAX

Dynamic Overload Protection

OFF

OFF Time

t

Dynamic Overload Protection

ON

ON Time
F
A

D

t
G
V

ToneFrequency ENT=H 20 22 24 KHz

TONE

ToneAmplitude ENT=H 0.4 0.6 0.8 Vpp

TONE

ToneDuty Cucle ENT=H 40 50 60 %

TONE

ToneRise or FallTime ENT=H 5 10 15 µs

r,tf

External Modulation Gain ∆

EXT M

External Modulation Input

EXTM

Voltage

Z

External Modulation

EXT M

Impedance

V

BypassSwitchVoltage Drop

SW

(MI toLNBA)

V

Overload FlagPinLogic Low IOL=8mA 0.28 0.5 V

OL

Overload FlagPinOFF State

I

OZ

Leakage Current
Control Input PinLogic Low 0.8 V

V

IL

Control Input PinLogic High 2.5 V

V

IH

Control Pins Input Current VIH=5V 20 µA

I

IH

Supply Current OutputsDisabled (EN=L) 0.3 1 mA

I

CC

Supply Current ENT=H, I

I

CC

I

T

OutputBackward Current EN=L, V

OBK

Thermal ShutdownThreshold 150

SHDN

IN2

=23V,I

=50mA, (unless otherwisespecified)

OUT

27

=400mA, ENT=H, VSEL=L, LLC=H1516

I

O

=400mA, ENT=VSEL=H, LLC=H

I

O

=400 mA, VSEL=H, LLC=H

I

O

I

=400 mA, VSEL=L, LLC=H

O

=15to19V, V

IN1

=22to26V, V

V

IN2
IN1=VIN2

=50to400mA

I

O

V

IN1=VIN2

=22V, V

=23± 0.5Vac,fac=50 KHz

Outputshorted, C

Outputshorted, C

/∆V

V

OUT

, f = 10Hz to 40KHz

EXTM

OUT
OUT

EXT

EXT

=13V
=18V

= 13 or 18V,

OUT

=4.7µF

=4.7µF

22
23

17.3 18
19

12.5 13
14

65 150 m V

45 dB

1100 ms

t

OFF

5
5

/15 ms

5

27
27

27

18.7 V

13.5 V

50
50

mV
mV

AC Coupling 400 mV

f = 10Hzto 40KHz 400 Ω

EN=L, ISW=300mA, V

= 4V 0.35 0.6 V

CC2-VMI

VOH=6V 10 µA

= 400mA 3.1 6 mA

OUT

0.23mA

V

IN1=VIN2

LNBA=VLNBB

=22V or floating

=18V

V
V

V
V

V

V

pp

o

C

6/18