| Distributor | Stock | Pricing | MOQ | PKG | Lead Time | Date Code | On Order Quantity | On Order Delivery | |
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26 pcs
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26 pcs | On Request | 1 | On Request | On Request | On Request | On Request | On Request |
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The UC3902N load share controller by Unitrode is an 8-pin device engineered to balance the current drawn from independent, paralleled power supplies. This is achieved by adjusting each supply's output current proportionally to a voltage on a share bus. The master power supply, which automatically regulates to the highest voltage, drives this share bus. The UC3902N then trims the output voltage of other paralleled supplies to ensure they support their share of the load current.
Key features include operation from 2.7V to 20V and a precision current sense amplifier with a gain of 40. It also incorporates UVLO (Undervoltage Lockout) circuitry and allows for user-programmable share loop compensation. The device is compatible with existing power supply designs that use remote output voltage sensing and utilizes a differential share bus for enhanced noise immunity.
This controller is suitable for applications involving paralleled power supplies. By scaling the current sense resistor appropriately, supplies with different output current capabilities can be paralleled, with each supply providing the same percentage of its output current capability for a given load. The device operates within a free-air temperature range of -40°C to 100°C.
| Qty | Low | High |
|---|---|---|
| 1+ | $1.92 | $1.92 |
Estimated market price range - modelled values for guidance only, not live distributor offers.
The UC3902N operates from 2.7 V to 20 V.
The current sense amplifier has a gain of 40.
The UC3902N operates from -40 °C to 100 °C.
The UC3902N comes in an 8-pin package.