UCC3895QG3

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The UCC3895QG3 is an offline multiphase controller with an embedded voltage position regulation (VPR) loop to maintain output voltage accuracy during load transients. It combines analog current-mode control and on-time control to increase light-load efficiency and lower thermal stresses in power transistors. Its embedded VPR loop adds a feature of a feedback control to the output voltage of the switcher. UCC3895QG3 devices can be used in AC to DC converters as well as in offline switching converters.

The UCC3895QG3 is based around a voltage position regulation (VPR) loop enabling advanced control logic and embedded protections to be implemented in the system. The device\'s internal current−mode control and on−time modulation features allows for current limited over− power and over−temperature protected output voltage accuracy and stability even during load transients. The output voltage is set up using an external resistor divider. It can be used as a PFC or an offline switcher in AC/DC or DC/DC power supplies, and is programmable over a wide range of frequencies and sensed input voltages.

The UCC3895QG3 provides excellent line and load regulation characteristics with very low output voltage ripple, allowing the regulation of output voltage regardless of the load current. It features a fast response to changes in input voltage, which helps avoid large surges in output voltage when the load changes abruptly. An optional over−current protection features helps to further protect the system by disconnecting the power when the peak current of the switcher exceeds certain predefined limits as a result of short circuits or heavy load changes.

The device includes various protection features such as input undervoltage lockout (UVLO) circuitry, peak current control (PCC) circuitry, and an over−temperature protection (OTP). The OTP is activated when the junction temperature exceeds a internally programmed temperature setpoint. UCC3895QG3 devices also feature sleep mode and a low power Shutdown mode. In sleep mode, the circuit is placed in a standby mode, while in Shutdown mode, the circuit is disabled to reduce power consumption.

UCC3895QG3 devices can operate at a maximum frequency of 400kHz. This device also has a dedicated port to enable synchronization to an external clock. The device has a minimum start−up time of 1.5ms and a maximum start−up time of 5ms to ensure high system reliability and faster load step response time.

UCC3895QG3 devices can be used in a wide range of applications including AC/DC power supplies, AC/DC converters and offline switching converters. It is capable of regulating the output voltage in the range of 0.15 V to 30 V at current ratings from 1A to 15A at duty cycles as low as 0.1. This device also features an adjustable synchronization frequency range from 0.4 to 400 kHz and works with both negative and positive voltage inputs.

In summary, UCC3895QG3 devices are versatile controllers designed for a wide range of applications including AC/DC power supply, AC/DC converter, and offline switching converter, that provide excellent line and load regulation characteristics with very low output voltage ripple, fast response to input voltage, various protection features, adjustable synchronization frequency and programmable frequency range from 0.4 to 400 kHz, and more. This device is a great choice for regulating output voltage regardless of the load current and offers an excellent combination of performance and features for the given price.

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