UC2823BNG4

Voltage - Supply (Vcc/Vdd):	10 V ~ 22 V
Base Part Number:	UC2823B
Supplier Device Package:	16-PDIP
Package / Case:	16-DIP (0.300", 7.62mm)
Operating Temperature:	-55°C ~ 150°C (TJ)
Control Features:	Frequency Control, Soft Start
Fault Protection:	Current Limiting
Frequency - Switching:	1MHz
Duty Cycle:	100%
Series:	--
Voltage - Start Up:	16V
Topology:	Boost, Buck, Flyback, Forward
Voltage - Breakdown:	--
Internal Switch(s):	No
Output Isolation:	Non-Isolated
Part Status:	Obsolete
Packaging:	Tube

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UC2823BNG4 is a high performance current mode PWM controller which is mainly used for AC-DC and offline converters, such as flyback converters, half bridge converters, forward converters and active clamp converters. This device is made up of a current-mode PWM generator and other components such as an error amplifier, a multiplier and an auxiliary multiplier.

Application field of UC2823BNG4

UC2823BNG4 is suitable for AC/DC and offline converter applications when used with a minimum number of external components. Typical applications of UC2823BNG4 include switching power supplies, DC/DC converters, LED drive, motor drive and battery charger.

Working Principle of UC2823BNG4

The working principle of UC2823BNG4 is basically composed of a current-mode PWM generator, an error amplifier, a multiplier and an auxiliary multiplier. The device contains a voltage reference, an error amplifier, a multiplier, an oscillator and all other required control circuitry.The output voltage of the error amplifier (Vea) is compared with the DAC reference voltage (Vdac), a difference-amplified signal is then sensed by the multiplier, and the result is fed to the oscillator. When Vea is greater than Vdac, a signal is sent to the oscillator and the output current of the PWM generator increases. When Vea is less than Vdac, the signal is cut off and the output current of the PWM generator decreases. This oscillator signal modulates the duty cycle of the PWM to maintain the desired voltage, and ensures a better stability of the converter.Auxiliary multiplier is also an important part of UC2823BNG4. Auxiliary multiplier has two signal inputs, an inverting pin (V) and a non-inverting pin (muxsel). These two signals are multiplied together and the result is used to control the oscillator frequency of the device. The auxiliary multiplier is designed to reduce lamp ripple or radio interference produced by the converter.UC2823BNG4 has several advanced functions, such as programmable soft-start, auto restart control, low-ripple auto-frequency modulation, dual selectable frequency and programmable zero current detection. These features make UC2823BNG4 more reliable and efficient in power supplies.

Conclusion

UC2823BNG4 is a high performance current mode PWM controller. It can be used in AC/DC and offline converter applications with a minimum number of external components. It features a current-mode PWM generator, an error amplifier, a multiplier and an auxiliary multiplier. This device also has several advanced functions, such as programmable soft-start, auto restart control, low-ripple auto-frequency modulation, dual selectable frequency and programmable zero current detection. Therefore, UC2823BNG4 is suitable for power supply applications.

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