Secondary Side Regulation Green Mode PWM Controller  
Part No. Features Function VCC UVLO (Typ.) IST CS(V) Duty Cycle FOSC Package
Max. VTH(ST) VOPR Typ.  Typ.  Max. Green Typ.
UC3800 LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS

* Dynamic peak current limiting for constant output power
* OTP,OLP,OVP, LNO-OV, Brownout and VDD clamp for higher security
* Fixed switch frequency 65kHz
* Low start-up current
* Cycle-by-cycle Current Limiting
Flyback Converters,  HV Start and build in OLP,UVLO,OCP, SCP, LEB. 30.0V 13.0V 7.0V 2uA 0.95V 85% VFB=3.5V SOP-8
22KHz 62KHz
UC3830G* Power Saving PWM with frequency modulation
for EMI reducing 
Flyback Converters, Hopping Technology
& Frequency BurstPFMPWM,
Fixed Frequency, 300mA Driving
Capability and build in OVP,OLP,UVLO,
OCP, SCP, LEB, OTP, Soft Start Etc.
30.0V 16.0V 10.0V 5uA 0.85V 75% Internal Fixed  DIP-8 SOT-26
20KHz 65KHz
UC3837 Low Cost Power-Saving Mode PWM Controller
for Flyback Converters

* Dynamic peak current limiting for constant output power
* OTP,OLP,OVP and VDD clamp for higher security
* Fixed switch frequency 65kHz
* Low start-up current
* Cycle-by-cycle Current Limiting
Flyback Converters, Hopping Technology & Frequency BurstPFMPWM, and build in OVP,OLP,UVLO,OCP, SCP, LEB, Soft Start, OTP, BNO Etc. 23.0V 14.5V 8.5V 5uA 0.65V 75%(Typ) VFB=3.5V SOT-26
22KHz 65KHz
UC3833L ADVANCED GREEN-MODE PWM CONTROLLER WITH FREQUENCY TRIPLE FOR PEAK POWER

* Frequency triple for peak power (195kHz)
* Adjustable soft start time
* Adjustable OLP (over load protection) delay timer(automatic recovery)
* LEB (Leading-Edge Blanking) on CS Pin
* Current mode control with Green Mode
Operation out pin clamping
Flyback Converters,and build in OVP,OLP sense by CT pin,UVLO,OCP, SCP, LEB, Soft Start, OTP Etc. 32.0V 20.0V 8.0V 2uA 0.92V 90%(Typ) - SOT-26
20KHz 65KHz
UC3837L Low Cost Power-Saving Mode PWM Controller
for Flyback Converters with latched shut down

* Dynamic peak current limiting for constant output power
* OLP with automatic recovery
* OTP and OVP
* VDD clamp for higher security
* Low start-up current
* Cycle-by-cycle current limiting
Flyback Converters, Hopping Technology & Frequency BurstPFMPWM, and build in OVP,OLP,UVLO,OCP, SCP, LEB, Soft Start, OTP, BNO Etc. 30.0V 20.0V 8.0V 2uA 0.92V 90%(Typ) VFB=3.5V SOT-26
20KHz 65KHz
UC3839* Power-Saving Mode PWM  Controller
With BNO And OTP Protection
Flyback Converters, Hopping Technology & Frequency BurstPFMPWM,
BNO,OTP Protection Pin, Adj OVP, OCP Pin and build in OVP,OLP,UVLO,OCP, SCP, LEB, Soft Start, Etc.
27.0V 16.0V 7.5V 9uA 0.85V 80% Internal Fixed  DIP-8 SOT-26
21.5KHz 65KHz
UB3846* Power-Saving Mode PWM  Controller Flyback Converters, Hopping Technology & Frequency BurstPFMPWM,
OVP,OLP,OTP,UVLO,OCP, SCP, LEB, Etc.
25.0V 16.3V 11.7V 5uA 1.0V 80% RI=95KΩ  SOP-8 SOT-26
15KHz 70KHz
UB3846B* Power-Saving Mode PWM  Controller  Flyback Converters, Hopping Technology & Frequency BurstPFMPWM, and build in OVP,OLP,UVLO,OCP, SCP, LEB, and OTP sense by RT pin. 25.0V 16.3V 11.7V 5uA 1.0V 80% RI=95KΩ  SOP-8
15KHz 70KHz
UC3848 High Performance Power-Saving Mode PWM Controllers

* Soft Start
* Over Temperature Protection
* Overload Protection
* Over Voltage Protection
* Leading Edge Blanking
* Cycle-by-Cycle Current Limiting
Flyback Converters, Hopping Technology & Frequency BurstPFMPWM, and build in OVP,OLP,UVLO,OCP, SCP, LEB, OTP, Soft Start Etc. 30.0V 14.2V 8.2V 22uA 0.86V 80% VFB=4.0V DIP-8 SOP-8
20KHz 68KHz
UC3849* Power-Saving Mode PWM Controllers Flyback Converters, Hopping Technology & Frequency BurstPFMPWM, and build in OVP,OLP,UVLO,OCP, SCP, LEB, and OTP sense by RT pin, Frequency By RI Pin. 36.0V 16.5V 10.5V 4uA 0.86V 85% RI=100KΩ  DIP-8 SOP-8
22KHz 65KHz
UC3849B LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS

* UTC proprietary frequency hopping technology for Improved EMI
performance.
* Power-saving mode for high light-load and standby efficiency
* Soft Start
* Dynamic peak current limiting for constant output power
* Built-in synchronized slope compensation
* OLP,OVP and VDD clamp for higher security
* Programming OTP for higher security
* Fixed switch frequency 65kHz
* Gate output voltage clamped at 15V
* Low start-up current
* Cycle-by-cycle Current Limiting
* Under voltage lockout (UVLO)
* Few external components required
Flyback Converters, Hopping Technology & Frequency BurstPWM, and build in OVP,OLP,UVLO,OCP, SCP, LEB, OTP, Soft Start Etc. 36.0V 16.5V 8.0V 2uA 0.92V 90% VFB=3.5V DIP-8 SOP-8
20KHz 65KHz
UC3852* PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit Protection Flyback Converters, Hopping Technology & Frequency BurstPWM, HV Start and build in OLP,UVLO,OCP, SCP, LEB, . 16.0V 12.8V 7.8V 20uA* 0.92V 87% Internal Fixed  DIP-8 SOP-8
42/65/103 KHz
UC3856 Low Cost Power-Saving Mode PWM Controller For Fly-Back Converters

* Dynamic peak current limiting for constant output power
* Built-in synchronized slope compensation
* OTP,OLP,OVP and VDD clamp for higher security
* High efficiency HV start
* Cycle-by-cycle current limiting
* Few external components required
Flyback Converters, Hopping Technology & Frequency BurstPFMPWM, HV Start and build in OLP,UVLO,OCP, SCP, LEB. 30.0V 13.0V 6.5V 20uA 0.65V 75% RI=100KΩ  SOT-26
22KHz 62KHz
UC3863 Low Cost Power-Saving Mode PWM Controller
for Flyback Converters

* Built-in synchronized slope compensation
* OTP,OLP,OVP and VDD clamp for higher security
* Programmable PWM Frequency
* Cycle-by-cycle Current Limiting
* Few external components required
Flyback Converters, Hopping Technology & Frequency BurstPFMPWM, and build in OVP,OLP,UVLO,OCP, SCP, LEB, OTP, Soft Start Etc. 30.0V 14.0V 7.5V 5uA 0.65V 75% RI=100KΩ  DIP-8 SOP-8 SOT-26
22KHz 65KHz
UC3863A * UTC proprietary frequency hopping technology for Improved EMI performance.
* Power-saving mode for high light-load and standby efficiency
* Dynamic peak current limiting for constant output power
* Built-in synchronized slope compensation
* OLP with automatic recovery
* OTP and OVP with automatic recovery
* VDD clamp for higher security
* Programmable PWM Frequency
* Low start-up current
* Cycle-by-cycle Current Limiting
* Under voltage lockout (UVLO)
* Few external components required
Flyback Converters, Hopping Technology & Frequency BurstPFMPWM, and build in OVP,OLP,UVLO,OCP, SCP, LEB, OTP, Soft Start Etc. 35.0V 18.0V 7.0V 2uA 0.65V 90% RI=100KΩ  HSOP-8 SOP-8 SOT-26
20KHz 65KHz
UC3863L Low Cost Power-Saving Mode PWM Controller
for Flyback Converters with latched shut down

* OLP with automatic recovery
* OTP and OVP with latch shut down
* Programmable PWM Frequency
* Low start-up current
* Cycle-by-cycle Current Limiting
* Few external components required
Flyback Converters, Hopping Technology & Frequency BurstPFMPWM, and build in OVP,OLP,UVLO,OCP, SCP, LEB, OTP, Soft Start Etc. 32.0V 20.0V 8.0V 2uA 0.92V 90% RI=100KΩ  SOT-26
20KHz 65KHz
UC3868* Power-Saving Mode PWM Controllers Flyback Converters, 
Frequency BurstPFMPWM, and build in OVP,OLP,UVLO,OCP, SCP, LEB, and OTP sense by RT pin, Frequency By RI Pin.
36.0V 16.5V 10.5V 4.0uA 0.86V 85% RI=100KΩ  DIP-8 SOP-8
22KHz 65KHz
UC3869 HIGH VOLTAGE GREEN MODE PWM CONTROLLER

* High voltage startup
* Power on soft start reducing MOSFET Vds stress
* Efficiency and minimum standby power
* Audio noise free operation
* Fixed 65KHZ switching frequency
* UVLO,OCP,OLP,OTP,OVP
Flyback Converters, HV Start and build in OVP,OLP,UVLO,OCP, SCP, LEB, and OTP sense by RT pin 35.0V 19.0V 7.0V 2uA 0.92V 90% VFB=3.0V DIP-8 SOP-8
20KHz 65KHz
UC3869A HIGH VOLTAGE GREEN MODE PWM CONTROLLER

* High voltage startup
* Power on soft start reducing MOSFET Vds stress
* Efficiency and minimum standby power
* Audio noise free operation
* Fixed 65 kHz switching frequency
* UVLO,OCP,OLP,OTP,OVP
Flyback Converters, HV Start and build in OVP,OLP,UVLO,OCP, SCP, LEB, and OTP sense by RT pin 30.0V 18.0V 7.0V 2uA 0.92V 90% VFB=3.0V DIP-8 SOP-8
20KHz 65KHz
UC3873 Low Cost Power-Saving Mode PWM Controller
for Flyback Converters

* Dynamic peak current limiting for constant output power
* Built-in synchronized slope compensation
* OLP, OVP and VDD clamp for higher security
* Programming OTP for higher security
* Cycle-by-cycle Current Limiting
* Few external components required
Flyback Converters, Hopping Technology & Frequency BurstPFMPWM,
OTP sense by RT pin, Fixed Frequency
and build in OVP,OLP,UVLO,OCP, SCP, LEB, Soft Start Etc.
30.0V 13.0V 8.5V 5uA 0.75V 75% Internal Fixed  SOT-26
22KHz 65KHz
UC3873A Low Cost Power-Saving Mode PWM Controller
for Flyback Converters

* Dynamic peak current limiting for constant output power
* Built-in synchronized slope compensation
* OLP with automatic recovery
* OTP and OVP( automatic recovery)
* Programming OTP for higher security
* Cycle-by-cycle current limiting
* Few external components required
Flyback Converters,OTP sense by RT pin, Fixed Frequency
and build in OVP,OLP,UVLO,OCP, SCP, LEB, Soft Start Etc.
35.0V 18.0V 7.0V 2uA 0.92V 90% VFB=3.5V SOT-26
20KHz 65KHz
UC3873L Low Cost Power-Saving Mode PWM Controller
for Flyback Converters with latch shut down

* Dynamic peak current limiting for constant output power
* Built-in synchronized slope compensation
* OLP with automatic recovery
* OTP and OVP( UC3873L with latch shut down)
* Programming OTP for higher security
* Cycle-by-cycle current limiting
* Few external components required
Flyback Converters, OTP sense by RT pin, Fixed Frequency
and build in OVP,OLP,UVLO,OCP, SCP, LEB, Soft Start Etc.
35.0V 18.0V 7.0V 2uA 0.92V 90% VFB=3.5V SOT-26
20KHz 65KHz
UC3873B Low Cost Power-Saving Mode PWM Controller
for Flyback Converters

* Built-in synchronized slope compensation
* OLP,OVP and VDD clamp for higher security
* -500/+500mA gate driver
* Programming OTP for higher security
* Cycle-by-cycle Current Limiting
* Few external components required
Flyback Converters, Hopping Technology & Frequency BurstPFMPWM,
OTP sense by RT pin, Fixed Frequency
and build in OVP,OLP,UVLO,OCP, SCP, LEB, Soft Start Etc.
30.0V 13.0V 7.0V 2.5uA 0.95V 78% Internal Fixed  SOT-26
22KHz 65KHz
UC3873HL Low Cost Power-Saving Mode PWM Controller
for Flyback Converters with latch shut down

* Built-in synchronized slope compensation
* OLP with automatic recovery
* OTP and OVP( UC3873HL with latch shut down)
* Programming OTP for higher security
* Fixed switch frequency 130kHz
* Cycle-by-cycle current limiting
* Few external components required
Flyback Converters, OTP sense by RT pin, Fixed Frequency
and build in OVP,OLP,UVLO,OCP, SCP, LEB, Soft Start Etc.
35.0V 18.0V 7.0V 2uA 0.92V 90% VFB=3.5V SOT-26
20KHz 130KHz
UC3875 LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS

* Dynamic peak current limiting for constant output power
* Built-in synchronized slope compensation
* OTP,OLP,OVP and VDD clamp for higher security
* Programmable PWM Frequency
* Cycle-by-cycle Current Limiting
* Few external components required
Flyback Converters, HV Start and build in OLP,UVLO,OVP,LEB, Frequency By RI Pin. 30.0V 20.0V 8.0V 250uA
(Max)
0.92V 90% RI=100KΩ  SOP-8
20KHz 65KHz
UC3875A LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS with latch up

* Dynamic peak current limiting for constant output power
* Built-in synchronized slope FBensation
* OTP,OLP,OVP and VDD clamp for higher security
* Programmable PWM Frequency
* Cycle-by-cycle Current Limiting
* Few external FBonents required
Flyback Converters, HV Start and build in OLP,UVLO,OVP,LEB, Frequency By RI Pin. 35.0V 18.0V 7.0V 750uA
(Max)
0.92V 90% RI=100KΩ  SOP-8
20KHz 65KHz
UC3875L LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS with latch up

* Built-in synchronized slope compensation
* OLP with automatic recovery
* OTP and OVP with latch up
* VDD clamp for higher security
* Programmable frequency
* Cycle-by-cycle Current Limiting
* Few external components required
Flyback Converters, HV Start and build in OLP,UVLO,OVP,LEB, Frequency By RI Pin. 32.0V 20.0V 8.0V 250uA
(Max)
0.92V 90% RI=100KΩ  SOP-8
20KHz 65KHz
UC3893* LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS Flyback Converters, and build in OVP,OLP,UVLO,OCP, SCP, LEB, and OTP sense by RT pin 30.0V 13.0V 8.0V 2.5uA 0.95V 85% VFB=3.5V SOP-8
22KHz 65KHz
*: Under  Development