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LM337 Datasheet(PDF) 4 Page - ON Semiconductor |
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LM337 Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 10 page LM337 http://onsemi.com 4 Figure 2. Load Regulation and DIAdj/Load Test Circuit Figure 3. Standard Test Circuit Figure 4. Ripple Rejection Test Circuit VO (min Load) - VO (max Load) Cin 1.0 mF R2 1% R1 120 CO + RL (max Load) Adjust Vin -VI LM337 Vout *Pulse testing required. 1% Duty Cycle is suggested. Load Regulation (mV) = VO (min Load) - VO (max Load) Load Regulation (% VO) = x 100 IL IAdj 1.0 mF -VO (min Load) -VO (max Load) VO RL + 1.0 mF CO R1 120 1% R2 Cin Adjust Vin LM337 To Calculate R2: R2 = - 1 R1 This assumes IAdj is negligible. * Pulse testing required. * 1% Duty Cycle is suggested. VI IAdj Vref IL VO 1.0 mF Vout RL + 1.0 mF CO 1N4002 D1* Cin 1% R2 Adjust Vin LM337 R1 120 14.3 V 4.3 V f = 120 Hz CAdj + Vout = -1.25 V * D1 Discharges CAdj if output is shorted to Ground. 1.0 mF 10 mF Vout VO * VO (min Load) Vref |
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