LNBEH21PD-TR

LNBEH21 LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ COMPLETE INTERFACE BETWEEN LNB AND I2CTM BUS BUILT-IN DC/DC CONTROLLER FOR SINGLE 12V SUPPLY OPERATION AND HIGH EFFICIENCY (Typ. 94% @ 750mA) TWO SELECTABLE OUTPUT CURRENT LIMIT (450mA / 750mA) ACCURATE BUILT-IN 22KHz TONE OSCILLATOR SUITS WIDELY ACCEPTED STANDARDS FAST OSCILLATOR START-UP FACILITATES DiSEqCTM ENCODING BUILT-IN 22KHz TONE DETECTOR SUPPORTS BI-DIRECTIONAL DiSEqCTM 2.0 13/18V CONTROL WORD COMMUNICATION SEMI-LOWDROP POST REGULATOR AND HIGH EFFICIENCY STEP-UP PWM FOR LOW POWER LOSS: Typ. 0.56W @ 125mA TWO OUTPUT PINS SUITABLE TO BYPASS THE OUTPUT R-L FILTER AND AVOID ANY TONE DISTORSION (R-L FILTER AS PER DiSEqC 2.0 SPECs, SEE APPLICATION CIRCUIT) CABLE LENGTH DIGITAL COMPENSATION OVERLOAD AND OVER-TEMPERATURE INTERNAL PROTECTIONS I2C WITH DIAGNOSTIC BITs ) s ( ct t e l o bs O ■ LNB SHORT CIRCUIT SOA PROTECTION WITH I2C DIAGNOSTIC BIT +/- 4KV ESD TOLERANT ON INPUT/ OUTPUT POWER PINS c u d ) s t( DESCRIPTION Intended for analog and digital satellite STB receivers/SatTV, sets/PC cards, the LNBEH21 is a monolithic voltage regulator and interface IC, assembled in POWER SO-20, specifically designed to provide the 13/18V power supply and the 22KHz tone signalling to the LNB downconverter in the antenna or to the multiswitch box. The LNBEH21 supports both methods of communication currently used, 13/18V Control Word Communication Mode and DiSEqCTM communication. In this application field, it offers a complete solution with extremely low component count, low power dissipation together with simple design and I2CTM standard interfacing. e t le o r P LNBEH21 Gate Sense Step-up PWM Controller Vup-Feedback VoTX Vup VoRX Vcc Byp SDA SCL Preregul.+ U.V.lockout +P.ON res. Linear Post-reg +Modulator +Protections V Select EXTM Diagnostics 22KHz Oscill. OM=low TEN/VSEL ISEL I²C interf. Enable ADDR Tone Detector DETIN DSQOUT Tone control 13/18V control OM=High July 2004 ■ o s b O - u d o r P e BLOCK DIAGRAM PowerSO-20 Echo-pulses control T RISE= T FALL = 500µs Rev. 1 1/22 LNBEH21 Table 1: Ordering Codes TYPE PowerSO-20 (Tube) PowerSO-20 (Tape & Reel) LNBEH21 LNBEH21PD LNBEH21PD-TR Table 2: Absolute Maximum Ratings Symbol Parameter Value Unit VCC DC Input Voltage -0.3 to 16 V VUP DC Input Voltage -03 to 25 V IO Output Current Internally Limited mA DC Output Pins Voltage -0.3 to 25 V Logic Input Voltage (SDA, SCL, DSQIN, ISEL) -0.3 to 7 V Detector Input Signal Amplitude -0.3 to 2 VPP VOH Logic High Output Voltage (DSQOUT) -0.3 to 7 V IGATE Gate Current VOTX/RX VI VDETIN VSENSE ± 400 Current Sense Voltage uc VADDRESS Address Pin Voltage ) s t( mA -0.3 to 1 -0.3 to 7 d o r V V Tstg Storage Temperature Range -40 to +150 °C Top Operating Junction Temperature Range -40 to +125 °C P e let Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 3: Thermal Data Symbol Rthj-case Thermal Resistance Junction-case Figure 1: Pin Configuration (top view) ) s ( ct u d o r P e t e l o s b O 2/22 o s b O - Parameter Value Unit 2 °C/W LNBEH21 Table 4: Pin Description PIN N° SYMBOL 18 VCC 17 16 GATE SENSE 19 VUP 2 VORX 12 SDA Output Port during 22KHz Tone RX Serial Data 13 SCL Serial Clock 14 NAME FUNCTION Supply Input External Switch Gate Current Sense Input Step-up Voltage TEN/VSEL DiSEqC or 13/18V TTL Logic Input 9 DETIN Tone Detector Input 15 DSQOUT 5 EXTM External Modulator 1, 6, 10, 11, 20 8 3 GND GROUND BYP ISEL Bypass Capacitor Current Limit Select 4 VOTX 7 ADDR Output Port during 22KHz Tone TX Address Setting DiSEqC Output 8V to 15V IC supply. A 220µF bypass capacitor to GND with a 470nF (ceramic) in parallel is recommended External MOS switch Gate connection of the step-up converter DC/DC Current Sense comparator input. Connected to current sensing resistor Input of the linear post-regulator. The voltage on this pin is monitored by internal step-ut controller to keep a minimum dropout across the linear pass transistor. RX Output to the LNB in DiSEqC 2.0 application. See truth tables for voltage selections and Communication Mode section for details. Bidirectional data from/to I2C bus. Clock from I2C bus. Depending on the value set for OM bit this pin enable/disable the internal 22KHz tone generator (OM=0) or switch the output voltage from 13V to 18V and vice versa (OM=1) 22kHz Tone Detector Input. Must be AC coupled to the DiSEqC 2.0 bus. Open drain output of the tone Detector to the main µcontroller for DiSEqC 2.0 data decoding. It is set LOW when a 22 KHz tone is detected. External Modulation Input acts on VOTX. Needs DC decoupling to the AC source. If not used, can be left open. Pins connected to Ground. Also internally connected to the die frame (exposed pad) for heat dissipation. Needed for internal preregulator filtering c u d e t le ) s t( o r P o s b O - Set high or floating for IO ≤ 750mA, connect to ground for IO ≤ 450mA. Output of the linear post-regulator/modulator to the LNB. See truth tables for voltage selections. ) s ( ct Four I2C bus addresses available by setting the Address Pin level voltage. See address pin characteristics table. u d o r P e t e l o s b O 3/22 LNBEH21 TYPICAL APPLICATION CIRCUITS Figure 2: Application Circuit for DiSEqC 1.x and Output Current < 450 mA D2 1N4001 Axial Ferrite Bead Filter F1 suggested part number: IC1 MURATA BL01RN1-A62 Panasonic EXCELS A35 F1 ISEL 3 19 VUP C2 220µF C9 100µF IC2 STS4DNFS30L VoRX C3 (***) 470nF Ceramic 2 Set TTX=1 C10(***) 10nF 17 GATE to LNB VoTX 4 D4(***) BAT43 LNBEH21 16 SENSE L1=22µH Rsc 0.1 Ω (**) DETIN 9 C4 (***) 470nF Ceramic Byp 8 C5(***) 470nF 18 VCC C1 220µF Vin 12V Tone Enable / 13/18 Selection 12 SDA EXTM 5 13 SCL ADDRESS 7 14 TEN/VSEL ro 0