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                  Home > PWM Controller
                  UC3826 Datasheet
                    

                  LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS

                   

                   

                  DESCRIPTION

                   

                  The UTC UC3826 provides a CCM/valley switching mixed
                  mode operation for better efficiency performance. The operation
                  mode stays at CCM at heavy load, and switch to valley switching at
                  light load.
                  The UTC UC3826 is a high performance current mode PWM
                  controller ideally suited for low standby power. Low VCC startup
                  current make the power reliable on startup design and a large
                  value resistor could be used in the startup circuit to minimize the
                  standby power. At no load condition, the IC operates in
                  power-saving mode for lower standby power, decreasing frequency
                  for Higher conversion efficiency at light load condition.
                  The UTC UC3826 contains protection with automatic recovery
                  including OLP (over load protection), OCP (cycle-by-cycle current
                  limiting), and UVLO (VCC over voltage clamp and under voltage
                  lockout). It also provides the protections including OTP (over
                  temperature protection), BNO(AC Brown Out protection) , LNO(AC
                  Over voltage protection), OVP (VCC or DC output over voltage
                  protection) with automatic recovery. To protect the power
                  MOSFET, Gate-drive output is fixed up to 16V max.
                  The internal slope compensation improves system stability at
                  high PWM duty cycle output. Leading-edge blanking on current
                  sense input removes the signal glitch, which offering minima
                  external component count in the design. Excellent EMI
                  performance is achieved with UTC proprietary frequency hopping
                  technique (ZL201020615247.1) together with soft driver control.
                  Audio noise is eliminated due to switch frequency more than 20kHz
                  during operation.
                  UTC UC3826 is packaged by using tiny SOT-26 package. It has
                  such applications as: battery charger, power adaptor, set-top box
                  power supplies, ink jet printers, open-frame SMPS.

                  FEATURES

                  * Proprietary frequency hopping for Improved EMI performance
                  * Cycle-by-cycle current limiting
                  * CCM/Valley Switching Operation
                  * Fixed switch frequency 60~70kHz
                  * Dynamic peak current limiting for constant output power
                  * Built-in synchronized slope compensation
                  * Gate output voltage clamped at 16V
                  * Adjustable DC output OVP/UVP/OTP
                  * OLP/VCC OVP/OTP/BNO/LNO (automatic recovery)
                  * Internal Soft Start

                   

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