Primary Side Regulation Green Mode PWM Power Switch  
Part No. Features Function BVDSS
(MIN.)
VCC(Max) UVLO (Typ.) CS O/P W MIN. FOSC Package
RDS(on)
(Max)
IST(Typ) VTH(ST) VOPR Typ.  (90V~265V) Green Typ.
US1651 PRIMARY-SIDE REGULATION PWM POWER SWITCH

* Programmable CV and CC regulation
* Primary-side sensing and regulation with No TL431 and opto-coupler
* Adjustable constant current and output power setting
* Built-in leading edge blanking (LEB)
* VDD under voltage lockout
* Cycle-by-Cycle current limiting
* Auto-restart in over voltage condition
Flyback Converters, Build-in MOSFET CC/CV, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc. 650V 33V 15.0V 8.5V 0.82V  - - SOP-8
12Ω 5uA 22KHz 50KHz
USR1652 PRIMARY-SIDE REGULATION PWM POWER SWITCH

* Programmable CV and CC regulation
* Primary-side sensing and regulation with No TL431 and opto-coupler
* Adjustable constant current and output power setting
* Built-in leading edge blanking (LEB)
* VDD under voltage lockout
* Cycle-by-Cycle current limiting
* Auto-restart in over voltage condition
Flyback Converters, Build-in MOSFET CC/CV, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc. 650V 33V 15.0V 8.5V 0.82V  - - DIP-8
5uA 22KHz 50KHz
US1653 High Precision CC/CV Primary-Side PWM Power Switch Flyback Converters,
Hopping Technology,Build-in MOSFET
CC/CV, PFM, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc.
650V 33V 15.0V 8.5V 0.82V  10W Min.CCMDCM DIP-8 SOP-8
5.0Ω 5uA Burst12KHz50KHz
US2351 HIGH PRECISION LOW COST MCM POWER SWITCH

* Power on soft-start
* Built-in error amplifier
* Built-in Leading Edge Blanking (LEB)
* Cycle-by-Cycle current limiting
* Over loading protection
* Output short-circuit protection
* VDD Under Voltage Lockout with hysteresis (UVLO)
* VDD OVP
Flyback Converters,
Hopping Technology,Build-in MOSFET
CC/CV, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc.
600V 40V 13.5V 7.8V 0.94V  - - SOP-8
15.0Ω 5uA - 60KHz
US2651 HIGH PRECISION LOW COST MCM POWER SWITCH

* Power on soft-start
* Built-in error amplifier
* Built-in Leading Edge Blanking (LEB)
* Cycle-by-Cycle current limiting
* Over loading protection
* Output short-circuit protection
* VDD Under Voltage Lockout with hysteresis (UVLO)
* VDD OVP
Flyback Converters,
Hopping Technology,Build-in MOSFET
CC/CV, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc.
600V 40V 13.0V 8.0V 0.86V  - - DIP-8 SOP-8
15.0Ω 35uA - 50KHz
US2652SQ LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS

* Proprietary frequency hopping for Improved EMI performance
* Low standby power with only 30~70mw
* Cycle-by-cycle current limiting
* CCM/Valley Switching Operation
* Fixed switch frequency 65~85kHz
* 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
* Halogen Free
Flyback Converters,
Hopping Technology,Build-in MOSFET
And build in OVP, OTP, OCP, OLP, UVLO, SCP, LEB, Soft Start Etc.
650V 28V 18.0V 7.0V 1.0V  - - DIP-7A
6.0Ω 3.5uA - 65KHz
US3651 High Precision CC/CV Primary-Side PWM Power Switch

* Built-in 600V Power MOSFET
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Built-in leading edge blanking
* Power on soft start
* Cycle-by-cycle current limiting
* Over voltage protection
* VDD under-voltage lockout
Flyback Converters,
Hopping Technology,Build-in MOSFET
CC/CV, PFM, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc.
600V 30V 14.5V 9.0V 0.76V  5W Min.CCMDCM DIP-8 SOP-8
15Ω 5uA 370Hz13KHz55KHz
US3651A High Precision CC/CV Primary-Side PWM Power Switch

* Built-in 650V Power MOSFET
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Built-in leading edge blanking
* Power on soft start
* Cycle-by-cycle current limiting
* Over voltage protection
* VDD under-voltage lockout
Flyback Converters,
Hopping Technology,Build-in MOSFET
CC/CV, PFM, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc.
650V 28V 14.5V 9.0V 0.80V  5W Min.CCMDCM DIP-8 SOP-8
15.0Ω 5uA 370Hz17KHz65KHz
US3652 High Precision CC/CV Primary-Side PWM Power Switch

* Built-in 600V Power MOSFET
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Built-in leading edge blanking
* Power on soft start
* Cycle-by-cycle current limiting
* Over voltage protection
* VDD under-voltage lockout
Flyback Converters,
Hopping Technology,Build-in MOSFET
CC/CV, PFM, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc.
600V 28V 14.5V 9.0V 0.76V  15W Min.CCMDCM DIP-8
4.0Ω 5uA 300Hz17KHz65KHz
USR3651 * Built-in 650V Power MOSFET
* ±5% constant voltage regulation at universal AC input
* High precision constant current regulation at universal AC input
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Frequency hopping to reduce system EMI
* Built-in leading edge blanking
* Built-in primary winding inductance
compensation
* Power on soft start
* Gate Output Maximum Voltage Clamped at
15V
* Cycle-by-cycle current limiting
* Over voltage protection
* VDD under-voltage lockout
Flyback Converters,
Hopping Technology,Build-in MOSFET
CC/CV, PFM, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc.
650V 28V 14.5V 9.0V 0.91V 5W Min.CCMDCM SOP-8
7.5Ω 5uA 370Hz17KHz65KHz
USR3651S High Precision CC/CV Primary-Side PWM Power Switch

* High Voltage startup circuit
* Built-in 600V Power MOSFET
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Built-in leading edge blanking
* Power on soft start
* Cycle-by-cycle current limiting
* Over voltage protection
* VDD under-voltage lockout
Flyback Converters, Build-in MOSFET CC/CV, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc. 600V 28V 14.5V 9.0V 0.90V  5W - DIP-8 SOP-8
15.0Ω 700uA 300Hz17KHz65KHz
USR3652 HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
* Built-in 650V Power MOSFET
* ±5% constant voltage regulation at universal AC input
* High precision constant current regulation at universal AC input
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Frequency hopping to reduce system EMI
* Built-in leading edge blanking
* Built-in primary winding inductance
compensation
* Power on soft start
* Gate Output Maximum Voltage Clamped at
15V
* Cycle-by-cycle current limiting
* Over voltage protection
* VDD under-voltage lockout
Flyback Converters, Build-in MOSFET CC/CV, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc. 650V 28V 14.5V 9.0V 0.90V  12W Min.CCMDCM SOP-8
5.0Ω
(TYP)
700uA 370Hz17KHz65KHz
USR3652S High Precision CC/CV Primary-Side PWM Power Switch

* High Voltage startup circuit
* Built-in 650V Power MOSFET
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Built-in leading edge blanking
* Power on soft start
* Cycle-by-cycle current limiting
* Over voltage protection
* VDD under-voltage lockout
Flyback Converters, Build-in MOSFET CC/CV, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc. 650V 28V 14.5V 9.0V 0.90V  12W Min.CCMDCM DIP-8
5.0Ω
(TYP)
700uA 370Hz17KHz65KHz
USRB01 High Precision CC/CV Primary-Side PWM Power Switch

* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Flyback topology in DCM operation
* Built-in power NPN
* Built-in leading edge blanking
* Open circuit protection
* Output over voltage protection
* VDD over voltage protection
* Short circuit protection
* Over temperature protection
Flyback Converters, Build-in BJT CC/CV, PFM, And build in OVP, OLP, UVLO, OCP, SCP, LEB Etc. 450V 30V 12.5V 6.8V 0.50V  - - SOP-8
- 1uA -
USRB01A High Precision CC/CV Primary-Side PWM Power Switch

* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Flyback topology in DCM operation
* Built-in power NPN
* Built-in leading edge blanking
* Open circuit protection
* Output over voltage protection
* VDD over voltage protection
* Short circuit protection
* Over temperature protection
Flyback Converters, Build-in BJT CC/CV, PFM, And build in OVP, OLP, UVLO, OCP, SCP, LEB Etc. 450V 30V 12.5V 6.8V 0.50V  - - SOP-8
- 1uA -
USRB02 High Precision CC/CV Primary-Side PWM Power Switch

* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Flyback topology in DCM operation
* Built-in power NPN
* Built-in leading edge blanking
* Audio noise free operation
* Open circuit protection
* Output over voltage protection
* VDD over voltage protection
* Short circuit protection
* Over temperature protection
Flyback Converters, Build-in BJT CC/CV, PFM, And build in OVP, OLP, UVLO, OCP, SCP, LEB Etc. 450V 30V 19.4V 7.1V 0.555V  - - SOP-8
- 5uA -
USRB04 HIGH PRECISION PRECISION LOW POWER SWITCH

* Universal AC input range and 5.0V output voltage
* Constant power mode operation at over load application
* Low cost and less BOM for buck and buck-boost applications
* 40kHz (typical) maximum switching frequency
* Frequency shuffling for EMI improvement
* Power on soft-start
* Built-in Leading Edge Blanking(LEB)
* Cycle-by-cycle current limiting
* FB pin open loop protection
* Output short-circuit protection
* VDD Under Voltage Lockout with Hysteresis
* VDD OVP
* On-Chip OTP
* LED Lighting System
Build-in BJT , And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft-Start Etc. 450V 20V 3.7 11.5 0.575V  - - SOP-8
- 10uA -
UCSR3654 High Precision CC/CV Primary-Side PWM Power Switch

* High Voltage startup circuit
* Built-in 650V Power MOSFET
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Built-in leading edge blanking
* Power on soft start
* Cycle-by-cycle current limiting
* Over voltage protection
* VDD under-voltage lockout
Flyback Converters, Build-in MOSFET CC/CV, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc. 650V 28V 14.5V 9.0V 0.90V  12W Min.CCMDCM DIP-8 SOP-8
1.6Ω 5uA 300Hz17KHz65KHz
UCSR3602S High Precision CC/CV Primary-Side PWM Power Switch

* High voltage startup circuit
* Built-in 600V Power MOSFET
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Built-in leading edge blanking
* Power on soft start
* Cycle-by-cycle current limiting
* Over voltage protection
* VDD under-voltage lockout
Flyback Converters, Build-in MOSFET CC/CV, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc. 600V 28V 14.5V 9.0V 0.90V  12W Min.CCMDCM DIP-7A
2.4Ω 700uA 300Hz17KHz65KHz
UCSR3651S High Precision CC/CV Primary-Side PWM Power Switch

* High Voltage startup circuit
* Built-in 650V Power MOSFET
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Built-in leading edge blanking
* Power on soft start
* Cycle-by-cycle current limiting
* Over voltage protection
* VDD under-voltage lockout
Flyback Converters, Build-in MOSFET CC/CV, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc. 650V 28V 14.5V 9.0V 0.90V  8W Min.CCMDCM DIP-7A SOP-8
700uA 300Hz17KHz65KHz
UCSR3652S High Precision CC/CV Primary-Side PWM Power Switch

* High voltage startup circuit
* Built-in 650V Power MOSFET
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Built-in leading edge blanking
* Power on soft start
* Cycle-by-cycle current limiting
* Over voltage protection
* VDD under-voltage lockout
Flyback Converters, Build-in MOSFET CC/CV, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc. 650V 28V 14.5V 9.0V 0.90V  12W Min.CCMDCM DIP-7A SOP-8 DIP-8
2.4Ω 700uA 300Hz17KHz65KHz
UCSR3654S High Precision CC/CV Primary-Side PWM Power Switch

* High Voltage startup circuit
* Built-in 650V Power MOSFET
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Built-in leading edge blanking
* Power on soft start
* Cycle-by-cycle current limiting
* Over voltage protection
* VDD under-voltage lockout
Flyback Converters, Build-in MOSFET CC/CV, And build in OVP, OLP, UVLO, OCP, SCP, LEB, Soft Start Etc. 650V 28V 14.5V 9.0V 0.90V  15W Min.CCMDCM DIP-7A DIP-8
1.6Ω 700uA 300Hz17KHz65KHz
Black: Under  Development