A8283SB

8283 PRELIMINARY INFORMATION (Subject to change without notice) November 21, 2000 LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR Intended for analog and digital satellite receivers, the low-noise block converter regulator (LNBR) is a monolithic linear and switching voltage regulator designed to provide power and interface signals to the LNB down converter via the coaxial cable. If the device is in stand-by mode (EN terminal LOW), the regulator output is disabled, allowing the antenna downconverters to be supplied or controlled by other satellite receivers sharing the same coaxial cable. Similar two-output LNB supply and control voltage regulators are the A8284SB/SLB. For slave operation in single-dish dual-receiver systems, the bypass function is implemented by an electronic switch between the master input terminal (MI) and the LNB terminal, leaving all LNB power and control functions to the master receiver. This electronic switch is closed if the device is powered, EN is HIGH, and OSEL is LOW. The regulator outputs are set to 12, 13, 18, or 20 V by the VSEL terminals. Additionally, it is possible to increase the selected voltage by 1 V to compensate for the voltage drop in the coaxial cable (LLC terminal HIGH). The LNBR combines a tracking switching regulator and low-noise linear regulator. Logic inputs (VSEL0, VSEL1, and LLC) select the desired output voltage. A tracking current-mode buck converter provides the linear regulator with an input voltage that is set to the output voltage plus typically 0.8 V. This maintains constant voltage drop across the linear regulator while permitting adequate voltage range for tone injection. The device is supplied in a 24-pin plastic DIP with batwing tabs (A8283SB), or a 24-lead SOIC power-tab package (A8283SLB). In both cases, the power tab is at ground potential and needs no electrical isolation. Data Sheet 27448 A8283SLB OSEL OLF VBULK MIOUT MI GND GND SENSE LNB LX VIN TCAP 1 2 3 24 23 22 EXTM VINT PUMPX VPUMP CPUMP GND GND ENT EN VSEL0 VSEL1 LLC 4 5 6 7 8 9 9 10 11 12 BUCK REG. CHARGE PUMP VOLTAGE CONTROL 21 20 19 18 17 16 15 14 13 Dwg. PP-072A Note that the A8283SB (dual in-line package) and A8283SLB (small-outline IC package) are electrically identical and share a common terminal number assignment. FEATURES I I I I I I I I I I Short-Circuit Protected Bypass Function for Slave Operation LNB Selection and Stand-By Function Built-In Tone Oscillator Factory Trimmed to 22 kHz, Facilitates DiSEqC™ (a trademark of EUTELSAT) Encoding Full Modulation With No Load Tracking Switch-Mode Power Converter for Lowest Dissipation Externally Adjustable Short-Circuit Protection LNB Short-Circuit Protection and Diagnostics Auxiliary Modulation Input Cable Length Compensation Internal Over-Temperature Protection ABSOLUTE MAXIMUM RATINGS Supply Voltage, VIN .......................... 47 V Output Current, IO .... Internally Limited Logic Input Voltage Range, VI ................................... -0.5 V to +7 V Bypass Switch Current, ISW ........................ Internally Limited Flag Output Voltage, VOLF .................. 7 V Operating Temperature Range, TA ............................... -20°C to +85°C Storage Temperature Range, TS ............................. -40°C to +150°C This device incorporates features that have patents pending. Always order by complete part number, e.g., A8283SLB . 8283 LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR FUNCTIONAL BLOCK DIAGRAM RS VBULK SENSE CPUMP PUMPX VPUMP 47 V MAX VIN LX + MI VINT VOLTAGE REG. BOOST VOLTAGE MIOUT 0 1 – 5V 176 kHz + 352 kHz 25 kΩ – + 7V VREF BUCK CONV. – + OVERCURRENT – + 800 mV + 150 mV CHARGE PUMP EN ÷2 ENT ÷8 & WAVESHAPING 22 kHz TONE TSD OLF OVERCURRENT 1 kΩ VSEL1 VSEL0 OSEL LLC TCAP Output Voltage Select Table VSEL0 L L L L H H H H VSEL1 L L H H L L H H LLC L H L H L H L H VLNB(typ) 13 V 14 V 18 V 19 V 12 V 13 V 20 V 21 V 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2000, Allegro MicroSystems, Inc. – LNB 5 kΩ EXTM 5 kΩ Dwg. FP-051-1 8283 LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR ELECTRICAL CHARACTERISTICS at TA = 25°C, ENT = L, EN = H, OSEL = H, LLC = L, VIN = 24 V, IO = 50 mA (unless otherwise noted). Limits Characteristic Supply Voltage Output Voltage Symbol VIN VO Test Conditions IO = 600 mA, VSEL0 = L, VSEL1 = L, LLC = L IO = 600 mA, VSEL0 = L, VSEL1 = L, LLC = L IO = 600 mA, VSEL0 = L, VSEL1 = L, LLC = H IO = 600 mA, VSEL0 = L, VSEL1 = H, LLC = L IO = 600 mA, VSEL0 = L, VSEL1 = H, LLC = H IO = 600 mA, VSEL0 = H, VSEL1 = L, LLC = L IO = 600 mA, VSEL0 = H, VSEL1 = L, LLC = H IO = 600 mA, VSEL0 = H, VSEL1 = H, LLC = L IO = 600 mA, VSEL0 = H, VSEL1 = H, LLC = H Line Regulation ∆VO ∆VO VOM(th) ftone Vtone(PP) dctone t r, t f Gmod Vmod(PP) Zmod ENT = H ENT = H ENT = H ENT = H ∆VO/∆Vmod, f = 10 Hz to 40 kHz AC coupling VO = 13 V, VI = 16 to 40 V VO = 18 V, VI = 21 to 40 V Load Regulation Current-Limiting Threshold Tone Frequency Tone Amplitude Tone Duty Cycle Tone Rise or Fall Time External Modulation Gain External Modulation Input Voltage External Modulation Impedance VO = 13 or 18 V, IO = 50 to 600 mA Min. Typ. Max. Units V V V V V V V V V mV mV mV mV kHz mV % µs V/V mV kΩ — 3.3 + ∆VBUCK 47 12.5 13.4 17.3 18.2 11.5 12.5 19.2 20.2 — — — 125 20 550 40 5.0 — — 13 14 18 19 12 13 20 21 4.0 4.0 80 135 22 680 50 10 5.0 — 13.5 14.6 18.7 19.8 12.5 13.5 20.8 21.8 40 40 180 145 24 800 60 15 — 160 f = 10 Hz to 40 kHz — 5.0 — continued next page ... www.allegromicro.com 3 8283 LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR ELECTRICAL CHARACTERISTICS at TA = 25°C, ENT = L, EN = H, OSEL = H, LLC = L, VIN = 24 V, IOUT = 50 mA (unless otherwise noted). Limits Characteristic Overload Flag Logic Low Overload Flag Leakage Current Logic Input Voltage Symbol VOL IOZ VIL VIH Logic Input Current Supply Current IIH IIN VIH = 5 V Outputs disabled (EN = L) ENT = H, IO = 600 mA, VO = 13 V Thermal Shutdown Temp. Linear Regulator Voltage Drop Switching Frequency Bypass Switch Current Limit Bypass Switch Voltage Drop (MI to LNB) TJ ∆VBUCK fO IswM Vsw VBULK – VO 16 • ftone OSEL = L OSEL = L, Isw = 300 mA Test Conditions IOL = 8 mA VOH = 5.5 V Min. — — — 2.0 — — — — — 320 630 — Typ. 0.28 ISWM or TJ > 165°C, high when IO < IOM and IO < ISWM and TJ < 130°C Tracking supply voltage to linear regulators Output voltage from MI (connect to terminal 9) Master input Ground Current limit setup resistor Output voltage to LNB (connect to terminal 4) Inductor drive point Supply input voltage (minimum, VLNB + 2.5 V) Capacitor for setting the rise and fall time of the outputs Logic input: when high, increases output voltage by 1 V for line length compensation Logic input: output voltage select Logic input: output voltage select Logic input: when high, enables device Logic input: when high, enables internal 22 kHz modulation Ground High side of charge-pump capacitor Gate supply voltage for high-side drivers Charge-pump drive Bypass capacitor for internal voltage reference External modulation input 6 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 8283 LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR A8283SB Dimensions in Inches (controlling dimensions) 0.014 0.008 24 NOTE 1 13 0.430 0.280 0.240 MAX 0.300 BSC 1 0.070 0.045 6 7 1.280 1.230 0.100 BSC 12 0.005 MIN 0.210 MAX 0.015 MIN 0.150 0.115 0.022 0.014 Dwg. MA-001-25A in Dimensions in Millimeters (for reference only) 24 NOTE 1 13 0.355 0.204 10.92 7.11 6.10 MAX 7.62 BSC 1 1.77 1.15 6 7 32.51 31.24 2.54 BSC 12 0.13 MIN 5.33 MAX 0.39 MIN 3.81 2.93 0.558 0.356 Dwg. MA-001-25A mm NOTES: 1. 2. 3. 4. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece. Exact body and lead configuration at vendor’s option within limits shown. Lead spacing tolerance is non-cumulative Lead thickness is measured at seating plane or below. www.allegromicro.com 7 8283 LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR A8283SLB Dimensions in Inches (for reference only) 24 13 0.0125 0.0091 0.2992 0.2914 0.491 0.394 0.050 0.016 0.020 0.013 1 2 3 0.6141 0.5985 0.050 BSC NOTE 1 NOTE 3 0° TO 8 0.0926 0.1043 0.0040 MIN. Dimensions in Millimeters (controlling dimensions) 24 13 Dwg. MA-008-25 in 0.32 0.23 7.60 7.40 10.65 10.00 1.27 0.40 0.51 0.33 1 2 3 15.60 15.20 1.27 BSC NOTE 1 NOTE 3 0° TO 8 2.65 2.35 0.10 MIN. NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown. 2. Lead spacing tolerance is non-cumulative 3. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece. Dwg. MA-008-25A mm 8 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000