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CS52015-1GT3 Datasheet(PDF) 4 Page - Cherry Semiconductor Corporation |
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CS52015-1GT3 Datasheet(HTML) 4 Page - Cherry Semiconductor Corporation |
4 / 7 page 4 Applications Information The CS52015-1 linear regulator provides adjustable volt- ages at currents up to 1.5A. The regulator is protected against overcurrent conditions and includes thermal shutdown. The CS52015-1 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. The 52015-1 has an output voltage range of 1.25V to 5.5V. An external resistor divider sets the output voltage as shown in Figure 1. The regulator maintains a fixed 1.25V (typical) reference between the output pin and the adjust pin. A resistor divider network R1 and R2 causes a fixed cur- rent to flow to ground. This current creates a voltage across R2 that adds to the 1.25V across R1 and sets the overall output voltage. The adjust pin current (typically 50µA) 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 ´ () + IAdj ´ R2 The term IAdj ´ R2 represents the error added by the adjust pin current. R1 is chosen so that the minimum load current is at least 2mA. R1 and R2 should be the same type, e.g. metal film for best tracking over temperature. While not required, a bypass capacitor from the adjust pin to ground will improve ripple rejection and transient response. A 0.1µF tantalum capacitor is recommended for Òfirst cutÓ design. Type and value may be varied to obtain optimum perfor- mance vs price. R1 + R2 R1 Adjustable Operation 020 30 40 50 60 40.0 Temperature ( °C) 80 45.0 50.0 55.0 60.0 65.0 70.0 90 100 10 70 110 120 130 IO = 10mA 15 101 Frequency (Hz) 25 35 45 55 65 75 85 102 103 104 106 105 TCASE = 25°C IOUT = 1.5A (VIN Ð VOUT) = 3V VRIPPLE = 1.0VPP CAdj = 0.1mF Adjust Pin Current vs. Temperature Ripple Rejection vs. Frequency 02 3 4 5 6 750 7 -100 0 100 200 Time mS 10 9 8 1 1500 -200 0 VOUT=3.3V COUT =CIN =22mF Tantalum CAdj =0.1mF Transient Response 1.5 2.5 3.0 3.5 1.5 VIN - VOUT (V) 1.7 1.9 2.1 2.3 3.1 3.3 1.0 4.0 2.5 2.7 2.9 3.5 2.0 4.5 5.0 6.0 5.5 6.5 7.0 Short Circuit Current vs VIN-VOUT Typical Performance Characteristics |
Similar Part No. - CS52015-1GT3 |
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Similar Description - CS52015-1GT3 |
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