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CS5201-1GSTR3G Datasheet(PDF) 4 Page - ON Semiconductor |
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CS5201-1GSTR3G Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 9 page CS5201−1 http://onsemi.com 4 10 Temperature (°C) Frequency (Hz) Figure 7. Adjust Pin Current vs. Temperature Figure 8. Ripple Rejection vs. Frequency Time (mS) VIN − VOUT (V) Figure 9. Transient Response Figure 10. Short Circuit Current vs. VIN − VOUT 85 101 3.5 300 0 70 65 60 55 50 45 40 0 20 30 40 50 60 70 80 90 100 110 120 130 75 65 55 45 35 25 15 102 103 104 105 106 3.3 3.1 2.9 2.7 2.5 2.3 2.1 1.9 1.7 1.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 200 100 0 −100 −200 1000 500 0 12 345 67 89 10 IO = 10 mA TCASE = 25°C IOUT = 1.0 A (VIN − VOUT) = 3.0 V VRIPPLE = 1.0 VPP CAdj = 0.1 mF VOUT = 3.3 V COUT = CIN = 22 mF Tantalum CAdj = 0.1 mF APPLICATIONS INFORMATION The CS5201−1 linear regulator provides adjustable voltages at currents up to 1.0 A. The regulator is protected against overcurrent conditions and includes thermal shutdown. The CS5201−1 has a composite PNP−NPN output transistor and requires an output capacitor for stability. A detailed procedure for selecting this capacitor is included in the Stability Considerations section. Adjustable Operation The CS5201−1 has an output voltage range of 1.25 V to 5.5 V. An external resistor divider sets the output voltage as shown in Figure 11. The regulator maintains a fixed 1.25 V (typical) reference between the output pin and the adjust pin. A resistor divider network R1 and R2 causes a fixed current to flow to ground. This current creates a voltage across R2 that adds to the 1.25 V across R1 and sets the overall output voltage. The adjust pin current (typically 50 mA) also flows through R2 and adds a small error that should be taken into account if precise adjustment of VOUT is necessary. The output voltage is set according to the formula: VOUT + VREF R1 ) R2 R1 ) IAdj R2 The term IAdj × R2 represents the error added by the adjust pin current. |
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