UNISONIC TECHNOLOGIES CO., LTD
UC3816A/B
CMOS IC
LOW COST POWER-SAVING
MODE PWM CONTROLLER
FOR FLYBACK CONVERTERS
4
5
6
DESCRIPTION
3
2
The UTC UC3816A/B provides a CCM/valley switching mixed
1
mode operation for better efficiency performance. The operation
mode stays at CCM at heavy load, and switch to valley switching at
light load.
SOT-26
The UTC UC3816A/B 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 UC3816A/B 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 UC3816A/B 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
* OLP/VCC OVP/OTP/BNO/LNO (automatic recovery)
* Internal Soft Start
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