Datasheet > UC3816A UC3816B

UC3816A UC3816B

更新时间： 2023-12-06 20:02:32

品牌	Logo	应用领域
友顺 - UTC		/
页数	文件大小	规格书
9页	331K
描述
low cost power-saving mode pwm controller for...

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UC3816A UC3816B 数据手册

UC3816A/B

CMOS IC



APPLICATION NOTE (Cont.)

As shown in Fig. 3, at deep light-load or no-load condition, the switching loss is the dominant factor. To improve

the light-load efficiency, burst mode operation will stop the switching cycle of the OUT pin when FB pin voltage is

below “V_{FB_IN}” Level and restart the switching cycle of the OUT pin when FB pin voltage is above “V_{FB_OUT}”.

V_FB

V_{FB_OUT}

V_{FB_IN}

V_OUT

switching

Fig. 3 Burst Mode Operation

Over Voltage Protection on V_CCPin ( V_CCOVP )

The V_CCOVP will shut down the switching of the power MOSFET whenever V_CC>V_OVP. The OVP event as

followed Fig.4.

V_CC

V_OVP

V_THD(ON)

V_FB

V_OLP

V_CC(MIN)

T₁<T_Delay

T₂>T_Delay

V_FB(IN)

Driver

ON/OFF

Fig.4 OVP case

Fig.5 OLP case

Over Load &Open Loop & Output Short Protection ( OLP or OSP )

OLP or OSP will shut down driver when V_FB> V_OLPfor continual a blanking time. The OLP or OSP event as

followed Fig.5.

Over Temperature Protection ( OTP )

OTP will shut down driver when the NTC resistor temperature T_J>T _(THR)

Brown in/out & DEM OVP Protection

To prevent high current stress at too low AC voltage condition, the UTC UC3816A/B implements an AC brown

in/out protection through the DEM pin. The current sourcing out from the DEM pin when the OUT pin is enabled is

monitored to have the AC input voltage level information. When the current keeps above the DEM_BNI threshold

(50μA, typ.) for more than BNI De-bounce time 7 cycles, the AC brown in condition is issued and the OUT is enabled.

Once if the current keeps under the DEM_BNO threshold (45.5μA, typ.) for more than BNO De-bounce time, the AC

brown out condition is issued and the OUT is disabled.

The equation is used to calculate the brown in/out level:

R_{DEM _U}

N_PRI

V_{AC _BNI}= 50u×

V_{AC _BNO}= 45.5u×

N_AUX

UNISONICTECHNOLOGIESCO.,LTD

7 of 9

QW-R103-161.E

www.unisonic.com.tw

1...4 5 678 9

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