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| Low Power-Loss Voltage Regulators PQ30RV31 PQ30RV31 Variable Output Low Power-Loss Voltage Regulator s Outline Dimensions 10.2MAX 3.60.2 4.50.2 2.80.2 7.40.2 s Features Maximum output current : 3A Compact resin full-mold package. Low power-loss (Dropout voltage : MAX.0.5V) Variable output voltage (setting range : 1.5 to 30V) Built-in ON/OFF control function. (Unit : mm) 29.1MAX PQ30RV31 4-1.4 13.5MIN 4-0.6 +0.3 -0 +0.2 -0.1 s Applications Power supply for print concentration control of word processors Series power supply for motors and solenoid Series power supply for VCRs and TVs 3-(2.54) (0.5) 1234 qqqq Internal connection diagram 1 Specific IC 4 3 2 1 DC input (VIN) 2 DC output (VO) 3 GND 4 Output voltage minute adjustment terminal (VADJ) s Absolute Maximum Ratings *1 *1 (Ta=25C) Symbol Rating Unit VIN 35 V VADJ 7 V IO 3 A PD1 2.0 W PD2 20 W Tj 150 C Topr -20 to +80 C Tstg -40 to +150 C Tsol 260 (For 10s) C *2 Parameter Input voltage Output adjustment terminal voltage Output current Power dissipation (No heat sink) Power dissipation (With infinite heat sink) Junction temperature Operating temperature Storage temperature Soldering temperature *1 *2 All are open except GND and applicable terminals. Overheat protection function may operate at 125= " In the absence of confirmation by device specification sheets,SHARP takes no responsibility for any defects that may occur in equipment using any SHARP devices shown in catalogs,data books,etc.Contact SHARP in order to obtain the latest version of the device specification sheets before using any SHARP's device. " 4.8MAX 15.60.5 (1.5) 3.20.1 Low Power-Loss Voltage Regulators s Electrical Characteristics Parameter Input voltage output voltage Load regulation Line regulation Ripple rejection Reference voltage Temperature coefficient of reference voltage Dropout voltage Quiescent current *3 PQ30RV31 (Unless otherwise specified, condition shall be VIN=12V, Vo=10V, Io=1.5A, R1=390, Ta=25C) Symbol VIN VO RegL RegI RR Vref TcVref Vi-O Iq Conditions IO=5mA to 3A VIN=11 to 21V, IO=0.5mA Refer to Fig. 2 Tj=0 to 125C,IO=5mA *3, IO=3A *3, IO=2A IO=0 MIN. 4.5 1.5 45 1.225 TYP. 0.5 0.5 70 1.25 1.0 0.3 0.2 MAX. 35 30 2.0 2.5 1.275 1.0 0.5 7 Unit V V % % dB V %/C V mA Input voltage shall be the value when output voltage is 95% in comparison with the initial value. Fig.1 Test Circuit VIN 1 q 2 q R2 3 q 0.33F 4 q Vref R1 Iq 390 + 47F VO A V IO R2 R2 VO=Vref X 1+ -------- =1.25X 1+ -------R1 R1 [R1=390, Vref =1.25V] V RL A Fig.2 Test Circuit of Ripple Rejection 1 q ei VIN 0.33F 2 q R2 3 q 4 q R1 390 47F + + ~ IO V eo ~ RL IO=0.5A, VIN=12V, VO=10V f=120Hz (sine wave) ei=0.5Vrms RR=20 log (ei/eo) Fig.3 Power Dissipation vs. Ambient Temperature 40 Fig.4 Overcurrent Protection Characteristics (Typical Value) 100 Relative output voltage (%) Power dissipation PD (W) PD1 :No heat sink PD2 :With infinite heat sink 30 80 60 40 20 PD2 10 PD1 0 20 0 50 100 150 Ambient temperature Ta (C) Note) Oblique line portion:Overheat protection may operate in this area. 0 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Output current IO (A) Low Power-Loss Voltage Regulators Fig. 5 Output Voltage Adjustment Characteristics(Typical value) 30 Output voltage VO (V) 25 20 15 10 5 0 101 0 102 103 R2 () 104 105 0 5 10 15 Input voltage VIN (V) Output voltage VO (V) R1 390 PQ30RV31 Fig.6 Output Voltage vs. Input Voltage 15 R1=390,R2=2.7k,Tj=25C 10 RL= 5 RL=3.3 20 Fig.7 Dropout Voltage vs. Junction Temperature 0.7 0.6 R1=390,R2=2.7k VIN ; 0.95VO Fig.8 Ripple Rejection vs. Input Ripple Frequency 90 80 Ripple rejection RR (dB) 70 60 50 40 30 20 10 0 Tj=25C,VIN=12V R1=390,R2=2.7k IO=0.5A,ei=0.5Vrms 0.1 1 10 100 Input ripple frequency f (kHz) 1000 No Cref Cref=3.3F Dropout voltage Vi-O (V) 0.5 0.4 0.3 0.2 1A 0.1 0 -25 0.5A 100 75 0 25 50 Junction temperature Tj (C) 125 IO=3A 2A Fig.9 Ripple Rejection vs. Output Current 90 Fig.10 Output Peak Current vs. Dropout Voltage(Typical) 7 80 70 60 No Cref Output peak current IOP (A) Ripple rejection RR (dB) Cref=3.3F 6.5 6 5.5 5 4.5 4 R1=390,R2=2.7k,Ta=25C 0 1 2345678 Dropout voltage Vi-O (V) 9 10 50 Tj=25C R1=390,R2=2.7k 40 VIN=12V,ei=0.5Vrms,f=120Hz 0 1 2 Output current IO (A) 3 Low Power-Loss Voltage Regulators Fig.8 Ripple Rejection vs. Input Ripple Frequency 7 PQ30RV31 Output peak current IOP (A) 6.5 6 5.5 5 4.5 4 -25 VIN=15V,R1=390,R2=2.7k 0 25 50 75 Dropout voltage Vi-O (V) 100 s ON/OFF Operation D1 VADJ D2 VIN 1 q 2 q R2 4 q 3 q D2 + VO R1 RL R2 CIN VADJ R1 R3 CO RL VO' RD VC High:Output OFF Low :Output ON Equivalent Circuit in OFF-state ON/OFF operation is available by mounting externally D2 and R3. When VADJ is forcibly raised above VREF (1.25V TYP) by applying the external signal, the output is turned off (pass transistor of regulator is turned off. When the output is OFF, VADJ must be higher then VREF MAX., and at the same time must be lower than maximum rating 7V. In OFF-state, the load current flows to RL from VADJ through R2. Therefore the value of R2 must be as high as possible. VO'=VADJ X RL/ (RL+R2) occurs at the load. OFF-state equivalent circuit R1 up to 10k is allowed. Select as high value of RL and R2 as possible in this range. In some case, as output voltage is getting lower (VO<1V), impedance of load resistance rises. In such condition, it is sometime impossible to obtain the minimum value of VO'. So add the dummy resistance indicated by RD in the figure to the circuit parallel to the load. |
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