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| rev. page date 1 of 4 04/2008 PART NUMBER: V78XX-1000 series DESCRIPTION: DC switching regulator, non-isolated description The V78XX series of switching regulators are designed to replace 78XX linear regulators, with the objective of drop-in replacement without the need for a heatsink, because the V78XX series features high efficiency under all line conditions. Built-in short-circuit and over-temperature protections ensure very rugged operations. Additionally, low ripple and noise performance make the parts useful in a wide range of applications. features *efficiency up to 95% *no need for heatsinks *wide input range *short circuit protection *thermal shutdown *low ripple and noise *pin compatible to LM78XX series *non-isolated model number V7803-1000 V7805-1000 V7806-1000 V7809-1000 V7812-1000 input voltage range 4.75~28 Vdc 6.5~32 Vdc 8~32 Vdc 11~32 Vdc 15~32 Vdc output voltage 3.3 Vdc 5 Vdc 6.5 Vdc 9 Vdc 12 Vdc output current 1000 mA 1000 mA 1000 mA 1000 mA 1000 mA efficiency Vin_min Vin_max 90% 83% 93% 88% 94% 90% 95% 92% 95% 94% OUTPUT SPECIFICATIONS item output voltage accuracy line regulation load regulation output ripple short circuit protection short circuit input power output current limit switching frequency dynamic load stability quiescent current thermal shutdown temperature coefficient max load capacitance conditions min. at 100% load Vin = min. to max. at full load 10% to 100% full load 20 MHz bandwidth, output w/ 10F cap continuous, auto recovery upon removal of short load impedance is 0.1 subject to over-temp shutdown fixed switching frequency topology 280 100%<->10% load Vin_min to Vin_max at no load internal IC junction -40C ~ 85C ambient typ. 2 0.2 0.4 20 0.5 330 5 150 max. 3 0.4 0.6 35 1.2 2000 450 100 7 0.02 2000 unit % % % mVp-p W mA KHz mV mA C %/C F GENERAL SPECIFICATIONS item operating temperature range operating case temperature storage temperature range cooling solderability storage humidity range case material case thermal impedance MTBF package weight conditions see derating curve min. -40 -40 -55 typ. max. 85 100 125 300 95 50 at 25C per MIL-HDBK-217F 2,000,000 3.7 unit C C C C % C/W hours grams free air convection 1.5 mm from case for 10 seconds relative humidity, non-condensing plastic (UL94-V0) 10 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page date 2 of 4 04/2008 PART NUMBER: V78XX-1000 series DESCRIPTION: DC switching regulator, non-isolated MECHANICAL DRAWINGS 11.50 0.453 8.90 0.350 Recommended PCB Layout Pattern 1.00 +0.15/-0 [0.040 +0.006/-0] 17.50 0.689 0.50 0.020 (TYP) 4.10 (3 PLCS) 2.54 [0.100] 1 2 3 2.54 [0.100] Top View 0.50 0.020 (3 PLCS) 1 2 3 PIN 1 2 3 2.54 0.100 (2 plcs) ASSIGNMENTS +Vin GND +Vout 2.15 0.085 (3 PLCS) 1 2 3 0.30 0.012 (3 PLCS) 5.08 0.200 3.21 0.126 units: mm(inches) pin tolerances: 0.10(0.004) general tolerances: 0.25(0.01) THERMAL DERATING CURVE Temperature Derating Graph Operating Temp.( C ) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page date 3 of 4 04/2008 PART NUMBER: V78XX-1000 series DESCRIPTION: DC switching regulator, non-isolated TYPICAL APPLICATION CIRCUIT Vin 1 V78XX-1000 2 3 Vout C1 22 F/50V GND C2 100 F/25V INPUT CAPACITOR (C1): A low ESR capacitor is recommended to keep the noise at the converter to a minimum. Ceramic capacitors are preferred but tantalum or low ESR electrolytic capacitors may also suffice. Place C1 as close as possible to pins 1 & 2. OUTPUT CAPACITOR (C2): A 100F/25V electrolytic capacitor is recommended. NOT FOR PARALLEL OPERATION This converter is not designed for parallel operation with another to increase output power. TEST CIRCUIT FOR EFFICIENCY & RIPPLE GRAPHS (PAGE4) Current Meter Current Meter Electronic Load + DC Power Source Voltage Meter Cin +Vin +Vout DC/DC Converter GND 0V 30cm, 18AWG A Cout B Voltage Meter Twisted 20MHz Oscilloscope A C01 + +A C02 B A 1. Cin = 10F / 50V for 500mA and 22F / 50V for 1A, Cout = 100F / 16V. 2. C01 = 10F / 50V Electrolytic, C02 = 0.1F / 50V Ceramic. 3. All points labeled A refer to one junction. 4. All points labeled B refer to one junction. 5. Use a short ground loop for probing. Do not use a wired ground clip. B B - 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page date 4 of 4 04/2008 PART NUMBER: V78XX-1000 series DESCRIPTION: DC switching regulator, non-isolated EFFICIENCY AND RIPPLE Efficiency 100 Output Ripple 50 40 30 20 10 0 V7803-1000 V7805-1000 V7812-1000 Efficiency (%) V7803-1000 80 V7805-1000 V7812-1000 70 60 4.75 8 12 16 20 24 28 Efficiency VS Vin(Full Load) 32 Vin(V) Ripple (mVpp) 90 4.75 8 12 16 20 24 28 32 Vin (V) Ripple vs. Vin ( Full Load) 100 95 50 45 Efficiency (%) Ripple (mVpp) 40 35 30 25 20 15 90 85 80 75 40 80 200 400 600 800 1000 1200 V7803-1000 V7805-1000 V7812-1000 V7803-1000 V7805-1000 V7812-1000 10 5 0 40 80 200 400 600 800 1000 1200 Output Current(mA) Efficiency vs. Load (Vin=Vin_min) Output Current (mA) Ripple vs. Load (Vin=Vin_min) 100 90 50 45 40 Efficiency (%) 80 70 60 50 40 40 80 200 400 600 800 1000 1200 V7803-1000 V7805-1000 V7812-1000 35 30 25 20 15 10 5 0 40 80 200 400 600 800 1000 1200 V7803-1000 V7805-1000 V7812-1000 Output Current (mA) Efficiency vs. Load (Vin=Vin_max) Output Current (mA) Ripple vs. Load (Vin=24V) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 |
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