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CS5205-3GDP3 Fiches technique(PDF) 4 Page - Cherry Semiconductor Corporation |
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CS5205-3GDP3 Fiches technique(HTML) 4 Page - Cherry Semiconductor Corporation |
4 / 7 page 4 The CS5205-X family of linear regulators provide fixed or adjustable voltages at currents up to 5A. The regulators are protected against short circuit, and include thermal shutdown and safe area protection (SOA) circuitry. The SOA protection circuitry decreases the maximum avail- able output current as the input-output differential volt- age increases. The CS5205-X 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 adjustable regulator (CS5205-1) has an output voltage range of 1.25V to 13V. An external resistor divider sets the output voltage as shown in Figure 1. The regulator main- tains 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 10mA. R1 and R2 should be the same type, e.g. metal film for best tracking over temperature. The adjust pin is bypassed to improve the transient response and ripple rejection of the regulator. Figure 1. Resistor divider scheme for the adjustable version. VOUT VIN CS5205-1 VIN Adj R1 R2 C1 VOUT C2 VREF IAdj CAdj R1 + R2 R1 Adjustable Operation Applications Information Typical Performance Characteristics: continued 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 0.0 101 Frequency (Hz) 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 102 103 104 105 TCASE = 25°C IOUT = 5A (VIN Ð VOUT) = 3V VRIPPLE = 1.6VPP 0.0 101 Frequency (Hz) 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 102 103 104 105 TCASE = 25°C IOUT = 5A (VIN Ð VOUT) = 3V VRIPPLE = 1.6VPP CAdj = 25mF Adjust Pin Current vs. Temperature Ripple Rejection vs. Frequency (Fixed Versions) Ripple Rejection vs. Frequency (Adjustable Version) |
Numéro de pièce similaire - CS5205-3GDP3 |
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Description similaire - CS5205-3GDP3 |
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