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CS52510-1 Arkusz danych(PDF) 6 Page - Cherry Semiconductor Corporation |
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CS52510-1 Arkusz danych(HTML) 6 Page - Cherry Semiconductor Corporation |
6 / 9 page Typical Performance Characteristics: continued 6 0.0 83.0 Temperature (C) 40.0 60.0 80.0 100.0 81.0 79.0 77.0 75.0 73.0 71.0 69.0 67.0 65.0 20.0 120.0 160.0 140.0 Adjust Pin Current vs Temperature Application Notes 50 0 -50 -100 7 0 02 5 0 Time ( ms) 100 13 4 COUT=330 mF CPOWER=110 mF CCONTROL=10 mF CADJUST=25 mF VCONTROL=5V VPOWER=3.3V VOUT=2.5V Current Step Transient Response The CS52510-1 linear regulator provides adjustable voltages from 1.25V to 5V at currents up to 10A. The regulator is pro- tected against short circuits, and includes a thermal shut- down circuit with hysteresis. The output, which is current limited, consists of a PNP-NPN transistor pair and requires an output capacitor for stability. A detailed procedure for selecting this capacitor is included in the Stability Considerations section. VPOWER Function The CS52510-1 utilizes a two supply approach to maximize efficiency. The collector of the power device is brought out to the VPOWER pin to minimize internal power dissipation under high current loads.VCONTROL provides power for the control circuitry and the drive for the output NPN transistor. VCONTROL should be at least 1V greater than the output volt- age. Special care has been taken to ensure that there are no supply sequencing problems. The output voltage will not turn on until both supplies are operating. If the control volt- age comes up first, the output current will be typically limit- ed to about 3mA until the power input voltage comes up. If the power input voltage comes up first the output will not turn on at all until the control voltage comes up. The output can never come up unregulated. The CS52510-1 can also be used as a single supply device with the control and power inputs tied together. In this mode, the dropout will be determined by the minimum con- trol voltage. Output Voltage Sensing The CS52510-1 five terminal linear regulator includes a dedi- cated Vsense function. This allows for true Kelvin sensing of the output voltage. This feature can virtually eliminate errors in the output voltage due to load regulation. Regulation will be optimized at the point where the sense pin is tied to the output. Adjustable Operation This LDO adjustable regulator has an output voltage range of 1.25V to 5V. An external resistor divider sets the output voltage as shown in Figure 1. The regulatorÕs voltage sensing error amplifier maintains a fixed 1.253V 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 1.253V 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 out- put voltage is set according to the formula: VOUT = 1.253V ´ + R2 ´ IADJ The term IADJ ´ R2 represents the error added by the adjust pin current. R1 is chosen so that the minimum load current is a least 10mA. R1 and R2 should be of the same composition for best tracking over temperature. The divider resistors should be placed as close to the load as possible. Figure 1: An external resistor divider sets the value of VOUT. The 1.253V reference voltage drops across R1. V SENSE V OUT V CONTROL V POWER CS52510-1 R1 Adjust R2 R1 + R2 R1 Design Guidelines Theory of Operation |
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