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UC2902 Fiches technique(PDF) 1 Page - Texas Instruments |
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UC2902 Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 6 page UC1902 UC2902 UC3902 PRELIMINARY SLUS232 - FEBRUARY 1999 FEATURES • 2.7V to 20V Operation • 8-Pin Package • Requires Minimum Number of External Components • Compatible with Existing Power Supply Designs Incorporating Remote Output Voltage Sensing • Differential Share Bus • Precision Current Sense Amplifier with Gain of 40 • UVLO (Undervoltage Lockout) Circuitry • User Programmable Share Loop Compensation Load Share Controller 1 3 2 4 8 6 7 5 + – R 40R LOAD SHARE CONTROLLER + – ADJ AMPLIFIER BIAS UVLO + – + – + – SHARE SENSE AMPLIFIER SHARE DRIVE AMPLIFIER 2.3V 35mV + 0.6V + CURRENT SENSE AMPLIFIER ERROR AMPLIFIER GND SENSE ADJ ADJR VCC SHARE+ SHARE– COMP BLOCK DIAGRAM UDG-99042 DESCRIPTION The UC3902 load share controller is an 8-pin device that balances the cur- rent drawn from independent, paralleled power supplies. Load sharing is accomplished by adjusting each supply’s output current to a level propor- tional to the voltage on a share bus. The master power supply, which is automatically designated as the supply that regulates to the highest voltage, drives the share bus with a voltage proportional to its output current. The UC3902 trims the output voltage of the other paralleled supplies so that they each support their share of the load current. Typically, each supply is designed for the same current level although that is not necessary for use with the UC3902. By appropriately scaling the current sense resistor, supplies with different output current ca- pability can be paralleled with each supply providing the same percentage of their output current capability for a particular load. A differential line is used for the share bus to maximize noise immunity and accommodate different voltage drops in each power converter’s ground re- turn line. Trimming of each converter’s output voltage is accomplished by injecting a small current into the output voltage sense line, which requires a small resistance (typically 20 Ω – 100Ω) to be inserted. |
Numéro de pièce similaire - UC2902 |
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Description similaire - UC2902 |
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