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| Low Power-Loss Voltage Regulators PQ30VB11 PQ30VB11 Variable Output Low Power-Loss Voltage Regulator(Built-in Overheat Shut-Down Function) s Features Compact resin full-mold package Low power-loss (Dropout voltage : MAX. 0.5V) Overheat shut-down function (keep shut-down output until power-on again) Variable output voltage (Setting range : 1.5 to 30V) Overcurrent protection type High-precision output type (Reference voltage precision : 2.0%) s Outline Dimensions 10.2MAX 3.60.2 (Unit : mm) 4.50.2 2.80.2 7.40.2 29.1MAX PQ30VB11 4-1.4 13.5MIN +0.3 -0 4-0.6 +0.2 -0.1 s Applications Series power supply for TVs and VCRs Switching power supply 1234 qqqq 3-(2.54) (0.5) 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 Parameter *1 *1 (Ta=25C) Symbol VIN VADJ IO PD1 PD2 Tj Topr Tatg Tsol Rating 35 7 1 1.25 12.5 150 -20 to +80 -40 to +150 260 Unit V V A W W C C C C *2 *3 *1 *2 *3 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 All are open except GND and applicable terminals. Overheat shut-down function operates at Tj>=110C. For 10s * Please refer to the chapter" Handling Precautions ". " 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 3.20.1 (1.5) 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 Overheat shut-down temperature *4 PQ30VB11 (Unless otherwise specified, condition shall be VIN=15V, Vo=10V, Io=0.5A, R1=390, Ta=25C) Symbol VIN VO RegL RegI RR Vref TeVref Vi-O Iq Tsd Conditions IO=5mA to 1A VIN=11 to 28V Refer to Fig. 2 Tj=0 to 125C, IO=5mA *4, IO=0.5A IO=0 MIN. 4.5 1.5 45 1.225 110 TYP. 0.3 0.5 55 1.25 1.0 130 MAX. 35 30 1.0 2.5 1.275 0.5 7 150 Unit V V % % dB V % V mA C 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 f=120Hz (sine wave) ei=0.5Vrms RR=20 log (ei/eo) Fig.3 Power Dissipation vs. Ambient Temperature 13 12 PD2 11 10 9 8 7 6 5 4 3 2 PD1 1 0 -20 0 50 100 150 Ambient temperature Ta (C) Note) Oblique line portion:Overheat protection operates in this area. Power dissipation PD (W) PD1 :No heat sink PD2 :With infinite heat sink Fig.4 Overcurrent Protection Characteristics (Typical Value) 100 80 Relative output voltage (%) 60 40 20 0 0.5 1.0 1.5 Output current IO (A) 2.0 Low Power-Loss Voltage Regulators Fig.5 Output Voltage Adjustment Characteristics 30 10 PQ30VB11 Fig.6 Output Voltage vs. Input Voltage Tj=25C VO=10V R1=390 R2=2710 Output voltage VO (V) 25 20 15 10 5 0 0.01 R1=390 Output voltage VO (V) 9 8 7 6 5 4 3 2 1 0 RL= RL=20 RL=10 0.1 R2 (k) 1 10 1 2 3 4 5 6 7 8 9 10 11 12 Input voltage VIN (V) Fig.7 Dropout Voltage vs. Junction Temperature 0.5 0.45 0.4 Fig.8 Circuit Operating Current vs. Input Voltage 40 Circuit operating current IBIAS (mA) 35 30 25 20 15 Dropout voltage Vi-O (V) Tj=25C VO=10V R1=390 R2=2710 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 -25 IO=1A 0.75A 0.5A 0.25A RL=10 RL=20 10 5 0 1 2 3 4 5 6 7 8 9 10 1112 1314 15 Input voltage VIN (V) RL= 0 25 50 75 100 Junction temperature Tj (C) 125 Fig.9 Output Peak Current vs. Junction Temperature 2.2 Output peak current IOP (A) 2 1.8 VIN-VO=5V 2V 1V 1.6 0.5V 1.4 IOP:Output current when output voltage 1.2 is 95% in comparison with the initial value -25 0 25 50 75 100 Junction temperature Tj (C) 125 Low Power-Loss Voltage Regulators s Overheat Shut-down Characteristics ON VIN PQ30VB11 OFF *Tsd Tj VO * Tsd:Overheat shut-down temperature (Tj>=110C) 1 Overheat shut-down operates at Tj=Tsd and output OFF-state is maintained. 2 OFF-state is kept until VIN is once turned off. 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'=VADJXRL/ (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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