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| rev. page date 1 of 5 04/2009 PART NUMBER: V78XX-500-SMT DESCRIPTION: DC switching regulator, non-isolated description The V78XX series of switching regulators is designed as a drop in replacement for 78XX linear regulators. Because the V78XX series features high efficiency under all line conditions, there is no need for a heatsink. Built-in short-circuit and over-temperature protections ensure very rugged operations. Additionally, low ripple and noise performance makes the parts useful in a wide range of applications. features *efficiency up to 96% *no need for heatsinks *wide input range *short circuit protection *thermal shutdown *low ripple and noise *non-isolated MODEL V7803-500-SMT V7805-500-SMT V7812-500-SMT V7815-500-SMT notes input voltage nominal 12 12 24 24 input voltage range 4.5~28 V dc 6~28 V dc 14~28 V dc 17~28 V dc output voltage nominal 3.3 5 12 15 output voltage range 1.8~5.5 V dc 2.5~8 V dc 4.5~13.5 V dc 4.5~15.5 V dc output current 500 mA 500 mA 500 mA 500 mA efficiency Vin_min Vin_max 90% 75% 94% 81% 95% 90% 96% 92% 1. Vin-Vo>2V, If needed to adjust the output voltage . 2. If the input voltage is above specified then permanent damage may be caused to the device. 3. V7812-500-SMT and V7815-500-SMT are not allowed to operate under no load. OUTPUT SPECIFICATIONS item output voltage accuracy line regulation load regulation output ripple short circuit protection output current limit 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 100%<->10% load normal input (3.3, 5 V output) -40C ~ 85C ambient typ. 2 0.2 0.3 10 1800 30 15 160 max. 3 0.5 0.75 25 unit % % % mVp-p mA mV mA C %/C F 75 0.02 1000 GENERAL SPECIFICATIONS item On/Off control current On/Off shutdown threshold voltage shutdown input current operating temperature range operating case temperature storage temperature range cooling solderability storage humidity case material MTBF package weight conditions on: open or 1.5 1.25 15 1.4 30 85 100 125 260 95 V A C C C C % hours grams 2,000,000 2.3 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page date 2 of 5 04/2009 PART NUMBER: V78XX-500-SMT DESCRIPTION: DC switching regulator, non-isolated MECHANICAL DRAWINGS 7.25 [0.285] 7.00 [0.276] (Side View) 11.02 [0.434] 10 9 76 2.54 [0.100] A 1 5 1.80 [0.071] 2.54 [0.100] 10 9 1 76 5 11.82 [0.466] 8.50[0.335] A 0.25 [0.010] 1.00 [0.039] 2.54 [0.100] (Top View) 5 1.13 [0.044] FOOTPRINT DETAILS Pin 1 7,9 5 6 10 Function Vin GND Vout Vadj ON/OFF 10.16[0.400] 15.24 [0.600] Note: Unit:mm[inch] Pin tolerances: 0.10mm[ 0.004inch] General tolerances: 0.25mm[ 0.010inch] PACKAGING DIMENSIONS Taping dimension: 1.50 [0.059] 15.65 [0.616] 14.70 [0.579] 10.20[0.402] 8.20 [0.323] 10.20 [0.402] 2.00 [0.079] 1.75 [0.069] 11.50 [0.453] 0.50 [0.020] 6.50 [0.256] 12.40 [0.488] Taping reel dimension: 16.00 [0.630] 1.50 [0.059] 7.65 [0.301] 29.40 [1.157] 100.00[3.937] 330.00 [12.992] 5.60 [0.220] Note: Unit :mm[inch] General tolerances: 0.50mm[ 0.020inch] 13.00 [0.512] L=530mm[20.866inch] Tube Quantity: 33pcs L=220mm[8.661inch] Tube Quantity: 13pcs 21.50 [0.846] Note: Unit :mm[inch] General tolerances: 0.50mm[ 0.020inch] Devices per reel quantity:500pcs THERMAL DERATING CURVE Temperature Derating Graph SOLDER REFLOW PROFILE 25 0 Peak.Temp 240 C 10 Sec Max 220 C 90 S ec M a x (>2 20 C ) 20 0 Tem pe ratu re ( C) 15 0 10 0 50 Operating Temp.( C ) 0 Tim e (s e c .) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page date 3 of 5 04/2009 PART NUMBER: V78XX-500-SMT DESCRIPTION: DC switching regulator, non-isolated TYPICAL APPLICATION CIRCUIT Choose a ceramic type capacitors; C3 is require ,for best performance , use a 100 F or more capacitor please. Vin 1 V78XX-500-SMT 10 7 ,9 6 5 Vout C1 106K/50V R1 C2 2 2 6 K /2 5 V C3 100 F ON /O F F C5 470p F R2 GND GND 1. 2. 3. C1,C2: Use ceramic capacitors; C3: Use a 100 F or more capacitor. C1,C2 are required and should be placed close to the pins of the converter, with shortest possible leads. No parallel connection or plug and play. EXTERNAL CAPACITOR TABLE Part Number V7803-500-SMT V7805-500-SMT V7812-500-SMT V7815-500-SMT C1 C2 (ceramic capacitor) (ceramic capacitor) 10uF/50V 10uF/50V 10uF/50V 10uF/50V 22uF/16V 22uF/16V 10uF/25V 10uF/25V OUTPUT TRIMMING Pa rt Na me V7803-500-SMT V7805-500-SMT V7812-500-SMT V7815-500-SMT Vo nom 3.3 V 5.0 V 12V 15V = Trim Down R 1(K ) 61 *Vo- 75.1 0 3.3-Vo 61*Vo-9 1.52 = 5.0 -Vo 71 *Vo- 287 .02 = 12-Vo = 6 6*Vo -26 9.37 15-Vo Trim Up R 2(K ) 75.1 0-10 *Vo = Vo -3.3 91.5 2-10 *Vo Vo -5.0 28 7.02- 20*Vo = Vo-1 2 = = 26 9.37- 15*Vo Vo-1 5 To trim the output of the device input the desired output voltage (Vo) into the proper equation. R1 trims the output voltage down and R2 trims the voltage up. If not using the trim feature place a 470pF ceramic capacitor between pin 6 and GND. Make sure that the desired output voltage is within the trim range. 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page date 4 of 5 04/2009 PART NUMBER: V78XX-500-SMT DESCRIPTION: DC switching regulator, non-isolated TEST CIRCUIT 1) Efficiency and Output Voltage Ripple Test 25.4m m 25.4m m 12.7m m Vin 1 C1 DC /DC Co nvert er 79 C5 5 C2 C3 Copp er strip 1F 10 F +Vout 2.54mm 2 .54 m m 6 470pF Cerami c Cer amic Ta ntalum Scope GND Copper strip 2) Start-up and Load Transient Response Test 5 0.8 m m Vin 1 C1 D C /DC C onv erter 79 C5 5 C2 C3 Co ppe r s trip +Vout 6 47 0p F C er am ic Scope GND Cop pe r s trip EFFICIENCY AND RIPPLE Efficiency (%) 100 90 80 70 60 50 40 30 20 10 0 20 50 80 120 160 200 240 280 320 360 400 440 480 500 550 Load (m A) V7803-500-SMT V7805-500-SMT V7812-500-SMT V7815-500-SMT Ripple (m V) 45 40 35 30 25 20 15 10 5 0 20 50 80 120 160 200 240 280 320 360 400 440 480 500 550 Load (m A) V7803-500-SMT V7805-500-SMT V7812-500-SMT V7815-500-SMT Efficiency VS Output Load (Vin=Norm) Efficiency (%) 100 95 90 85 80 75 70 65 60 55 50 45 40 4.5 6 8 10 12 14 16 17 20 22 24 26 28 Vin(V) V7803-500-SMT V7805-500-SMT V7812-500-SMT V7815-500-SMT Output Voltage Ripple VS Output Load (Vin=Norm) Ripple (mV) 45 40 35 30 25 20 15 10 5 0 4.5 6 8 10 12 14 16 17 20 22 24 26 28 Vin (V) V7803-500-SMT V7805-500-SMT V7812-500-SMT V7815-500-SMT Efficiency VS Input Voltage (Full Load) Output Voltage Ripple VS Input Voltage (Full Load) 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 L oa d Load rev. page date 5 of 5 04/2009 PART NUMBER: V78XX-500-SMT DESCRIPTION: DC switching regulator, non-isolated SHUTDOWN CONTROL The ON/OFF pin provides several features for adjusting and sequencing the power supply, a user has the flexibility of using the ON/OFF pin as: 1) A digital on/off control by pulling down the ON/OFF pin with an open-drain transistor. ON/OFF 2) Line UVLO. If desired to achieve a UVLO voltage, a resistor divider from Vin to ON/OFF to GND can be used to disable the converter until a higher input voltage is achieved. For example, it is not useful for a converter with 12V output to start up with a 12V input , as the output cannot each regulation. To enable the converter when the input voltage reaches 14V, a 51k/5k voltage divider from Vin to GND can be connected to the ON/OFF pin. Both the precision 1.25V threshold and 150mV hysteresis are multiplied by the resistor ratio, providing a proportional 12% hysteresis for any startup threshold. So, the turn off threshold would be between 12.3V to 15.7V. Vin 51 K 1 V78XX-500-SMT 5 +Vout C1 5 K 470pF 100 F GND 3) Power supply sequencing. By connecting a small capacitor from ON/OFF to GND, the 2 A current source and 1.25V threshold can provide a stable and predictable delay between startup of multiple power supplies. For example, a startup delay of roughly 64mS is provided using 100nF, and roughly 136mS by using 200nF. Vin 1 V78XX-500-SMT 5 C1 +Vout C5 470pF 100 F GND 100nF CH1: Von/off CH2: Vo Delay time: 64mS Vin 1 C1 V78XX-500-SMT 5 +Vo ut C5 4 70 pF 1 00 F GND 2 00 nF CH1: Von/off CH2: Vo Delay time: 136mS 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 Load 10 7,9 6 Loa d 10 7,9 6 Lo ad 10 7,9 6 |
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