LNBEH21PD STMICROELECTRONICS [STMicroelectronics], LNBEH21PD Datasheet
LNBEH21PD
Related parts for LNBEH21PD
LNBEH21PD Summary of contents
Page 1
STEP-UP CONVERTER AND I COMPLETE INTERFACE BETWEEN LNB 2 TM AND I C 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 ...
Page 2
... 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 R Thermal Resistance Junction-case thj-case Figure 1: Pin Configuration (top view) 2/22 PowerSO-20 (Tube) LNBEH21PD Parameter Parameter PowerSO-20 (Tape & Reel) LNBEH21PD-TR Value Unit -0 - Internally Limited ...
Page 3
Table 4: Pin Description PIN N° SYMBOL NAME 18 V Supply Input CC 17 GATE External Switch Gate 16 SENSE Current Sense Input 19 V Step-up Voltage Output Port during O 22KHz Tone RX 12 SDA ...
Page 4
LNBEH21 TYPICAL APPLICATION CIRCUITS Figure 2: Application Circuit for DiSEqC 1.x and Output Current < 450 mA Axial Ferrite Bead Filter Axial Ferrite Bead Filter F1 F1 suggested part number: suggested part number: MURATA BL01RN1-A62 MURATA BL01RN1-A62 Panasonic EXCELS A35 ...
Page 5
APPLICATION INFORMATION This IC has a built in DC/DC Step-Up controller that, from a single supply source ranging from 8 to 15V, generates the input voltages (V of 1.65W typ. @ 750mA load (the linear regulator drop voltage is internally ...
Page 6
LNBEH21 DATA VALIDITY As shown in fig. 4, the data on the SDA line must be stable during the high period of the clock. The HIGH and LOW state of the data line can only change when the clock signal ...
Page 7
Figure 6: Acknowledge On I LNBEH21 SOFTWARE DESCRIPTION INTERFACE PROTOCOL The interface protocol comprises start condition ( chip address byte = hex (the LSB bit determines read(=1)/write(=0) transmission sequence of data ...
Page 8
LNBEH21 2 RECEIVED DATA (I C bus READ MODE) The LNBEH21 can provide to the Master a copy of the SYSTEM REGISTER information via I read mode. The read mode is Master activated by sending the chip address with R/W ...
Page 9
VOM bit and TEN/VSEL pin functions with OM=1 (13/18V Control Word mode). - When OM=1, the TEN/VSEL controls the 13/18V output voltage level. The usage of the TEN/VSEL pin in combination with the VOM bit allows the 13/18V Control Word ...
Page 10
LNBEH21 Figure 7: DETIN/DSQOUT Circuit LNBEH21 DETIN Tone Detector DSQOUT R1 2.5K 13/18V Control Word mode, OM=1 When OM=1 the VOM is used to force the DC/DC Converter output voltage (V control the TEN/VSEL pin function. According to the VOM ...
Page 11
DiSEqC COMMUNICATION TRUTH TABLE (TEN/VSEL pin controls the internal 22KHz Tone) PCL TTX OM LLC VOM 13/18V CONTROL WORD COMMUNICATION TRUTH TABLE (TEN/VSEL pin function depends on VOM ...
Page 12
LNBEH21 Table 5: Electrical Characteristics T Disabled, TTX=0/1, ISEL=High section for I C access to the system register. Symbol Parameter V Supply Voltage I I Supply Current I V Output Voltage O V Output Voltage O V Line ...
Page 13
Symbol Parameter I Output Backward Current OBK T Temperature Shutdown SHDN Threshold T Temperature Shutdown SHDN Hysteresis Table 6: Gate And Sense Electrical Characteristics (T Symbol Parameter R Gate LOW R DSON-L DSON R Gate HIGH R DSON-H DSON V ...
Page 14
LNBEH21 THERMAL DESIGN NOTES During normal operation, this device dissipates some power. The power dissipation depends on the selected communication mode (DiSEqC or 13/18 control word communication). When the device is used in DiSEqC mode, at maximum rated output current ...
Page 15
TYPICAL CHARACTERISTICS (unless otherwise specified T Figure 10: Output Voltage vs Temperature Figure 11: Output Voltage vs Temperature Figure 12: Load Regulation vs Temperature = 25°C) j Figure 13: Supply Current vs Temperature Figure 14: Supply Current vs Temperature Figure ...
Page 16
LNBEH21 Figure 16: Dynamic Overload Protection ON Time vs Temperature Figure 17: Dynamic Overload Protection OFF Time vs Temperature Figure 18: Output Current Limiting vs Temperature 16/22 Figure 19: Output Current Limiting vs Temperature Figure 20: Tone Frequency vs Temperature ...
Page 17
Figure 22: Tone Duty Cycle vs Temperature Figure 23: Tone Rise Time vs Temperature Figure 24: Tone Fall Time vs Temperature Figure 25: Undervoltage Lockout Threshold vs Temperature Figure 26: Output Backward Current vs Temperature Figure 27: DC/DC Converter Efficiency ...
Page 18
LNBEH21 Figure 28: Current Limit Sense Voltage vs Temperature Figure 29: 22kHz Tone Waveform V =12V, I =50mA, EN=TEN Figure 30: TEN/VSEL Tone Enable Transient Response V =12V, I =50mA, EN=1, Tone enabled by DSQIN Pin CC O ...
Page 19
DIM. MIN 0. 0.40 c 0.23 D (1) 15.80 E 13. (1) 10. 0. 0˚ T (1) “D and E1” do not include mold ...
Page 20
LNBEH21 Tape & Reel PowerSO-20 MECHANICAL DATA DIM. MIN 12 15.1 Bo 16.5 Ko 3.8 Po 3.9 P 23.9 W 23.7 20/22 mm. TYP MAX. 330 13.2 0.504 0.795 2.362 30.4 15.3 ...
Page 21
Table 9: Revision History Date Revision 05-Jul-2004 1 Description of Changes First Release. LNBEH21 21/22 ...
Page 22
LNBEH21 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its ...