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PQ30RV1 Datasheet(PDF) 7 Page - Sharp Corporation |
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PQ30RV1 Datasheet(HTML) 7 Page - Sharp Corporation |
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7 / 9 page  Low Power-Loss Voltage Regulators PQ30RV1/PQ30RV11/PQ30RV2/PQ30RV21 q ON/OFF operation is available by mounting externally D2 and R3. q 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. q VO'=VADJ✕RL/(RL+R2) occurs at the load. OFF-state equivalent circuit R1 up to 10k Ω 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. s ON/OFF Operation VC High : Output OFF Low : Output ON D2 R3 R1 R2 CO + VO RL VADJ D1 CIN VIN R1 Equivalent Circuit in OFF-state R2 RL D2 VO' VADJ RD 1 2 4 3 s An Example of ON/OFF Circuit Using the 1-chip Microcomputer Output Port(PQ30RV1) <Specification> Output port of microcomputer VOH(max)=0.5 V VOH(min)=2.4 V (IOH=0.2mA) MAX. rating of IOH=0.5mA Output should be set as follows. 15.6V RL=52 Ω(IO=0.3A) From VO=1.25V(1+R2/R1)we get VO=15.6V. R2/R1=11.48 Assuming that VF(max)=0.8V for D2 in case of VOH(min)=2.4V, we get VADJ=VOH(min)–VF(max)=2.4V–0.8V=1.6V. From Vref(max)=1.3V we get R3=0 Ω If R1=10k Ω, we get R2=11.48✕R1=114.8kΩ and IOH as follows, ingnoring RL (52Ω): IOH=1.6V✕(R1+R2)/R1✕R2 =1.6V✕(10k Ω+114.8kΩ)/10kΩ✕114.8kΩ=0.17mA Hence, IOH<0.2mA. Therefore VOH(min)is ensured. Next, assuming that VF(min)=0.5V for D2 in case of VOH(max), we get: IOH=(5V–0.5V)(R1+R2)/R1✕R2=0.49mA which is less than the rating. Figure 1 shows the VO–VC characteristics when R1=10k Ω, R2=115kΩ, R3=0Ω, VIN=17V, RL=52Ω, and D1=1S2076A(Hitachi). |
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