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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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CS5253-1GDP5 데이터시트(PDF) 6 Page - Cherry Semiconductor Corporation |
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CS5253-1GDP5 데이터시트(HTML) 6 Page - Cherry Semiconductor Corporation |
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6 / 9 page  6 Typical Performance Characteristics: Continued 0 5 10 15 20 25 30 0 20 40 60 80 100 120 140 Junction Temperature (C) VPOWER = 6V VOUT = 0V VCONTROL not connected VPOWER Only Output Current vs Junction Temperature The CS5253-1 linear regulator provides adjustable voltages from 1.26V to 5V at currents up to 3A. 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 CS5253-1 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 for the con- trol circuitry and the drive for the output NPN transistor. VCONTROL should be at least 1V greater than the output voltage. 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 voltage comes up first, the output current will be limited to about three milliamperes 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 CS5253-1 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 control voltage. Output Voltage Sensing The CS5253-1 five terminal linear regulator includes a ded- icated 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 1.26V to 5V. An external resistor divider sets the output voltage as shown in Figure 1. The regulatorÕs voltage sens- ing error amplifier maintains a fixed 1.260V 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 1.260V across R1 and sets the overall out- put 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 neces- sary. The output voltage is set according to the formula: VOUT = 1.260V ´ + 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 at least 10mA. R1 and R2 should be of the same composi- tion for best tracking over temperature. The divider resis- tors should be placed physically as close to the load as pos- sible. Figure 1: Typical application schematic. The resistor divider sets VOUT, with the internal 1.260V reference dropped across R1. V SENSE V OUT V CONTROL V POWER CS5253-1 R1 Adjust R2 5V 3.3V 2.5V @3A R1+R2 R1 Design Guidelines Theory of Operation 40 0 20 40 60 80 100 120 140 Junction Temperature (C) 35 30 25 20 15 10 5 0 IOUT = 3A IOUT = 1A IOUT = 100mA VPOWER = 2.05V VCONTROL = 2.75V VCONTROL Supply Current vs Junction Temperature |
유사한 부품 번호 - CS5253-1GDP5 |
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유사한 설명 - CS5253-1GDP5 |
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