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UTCLM317 Datasheet(PDF) 4 Page - Unisonic Technologies |
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UTCLM317 Datasheet(HTML) 4 Page - Unisonic Technologies |
4 / 4 page UTCLM317 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R101-009,B APPLICATION CIRCUIT 1 2 3 Vo R1 R2 Vi C1 0.1 µF Co 1 µF Iadj 1 2 3 Vo Vi D1 1N4002 720 Ω 120 Ω 1k Ω 1 µF TTL Level signal UTC LM317 ll Fig.5 Programmable voltage regulator Fig.6 Regulator with On-off control Vo=1.25V*(1+R2/R1)+Iadj*R2 C1 is required when regulator is located an appreciated distance from power supply. Co is needed to improve transient response. UTC LM317 1 2 3 UTC LM317 1 2 3 Vo Vi Vadj R2 240 Ω 50k Ω D1 1N4001 10 µF Io Iadj R1 R2 Vo Vi Iomax=( Vref R1 )+Iadj= 1.25V R1 Iomin=( Vref R1+R2 )+Iadj= 1.25V R1+R2 5mA<Io<100mA Fig.7 Soft start application Fig.8 Constant current application |
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