Current Mode PWM Controller  
Part No. Features Function VCC UVLO (Typ.) FOSC CS(V) Duty Cycle Output Package
Max. VTH(ST) VOPR Max. Typ.  Max. Type IO(Max.)
UC2843B High Performance Current Mode PWM Controllers

* Latching PWM for cycle-by-cycle current limiting
* Trimmed oscillator discharge current
* Automatic feed-forward compensation
* Internally trimmed reference with UVLO
* Double-pulse suppression
Single End,Vref=±1%, OCP, SCP, LEB, UVLO 30.0V 8.4V 7.6V 500KHz 1.0V 100% Totem-pole 1000mA DIP-8 SOP-8
UC3842A *Low Start Up Current ( Typical 0.12mA )
*Automatic Feed Forward Compensation
*Pulse-by-Pulse Current Limiting
*Double Pulse Suppression
*High Current Totem Pole Output to Drive MOSFET Directly
*Internally Trimmed Band Gap Reference
*500kHz Operation
Single End,Vref=±2%, OCP, SCP, LEB, UVLO Ist=0.12mA(Typ.) 30.0V 16.0V 10.0V 500KHz 1.0V 100% Totem-pole 1000mA DIP-8 SOP-8
UC3843A 8.4V 7.6V
UC3842B High Performance Current Mode PWM Controllers

* Trimmed oscillator for precise frequency control
* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* High current totem pole output
* Undervoltage lockout with hysteresis
Single End,Vref=±2%, OCP, SCP, LEB, UVLO Ist=0.3mA(Typ.) 30.0V 16.0V 10.0V 500KHz 1.0V 100% Totem-pole 1000mA DIP-8 SOP-8
UC3843B 8.4V 7.6V
UC3842G * Low startup and operating current
* User defined switching frequency(Norm is 52kHz)
* Power-saving mode for low power
* Under voltage lockout with hysteresis
* Latching PWM for Cycle-By-Cycle current limiting
* Internally trimmed reference with undervoltage lockout
Single End, Hopping Technology & Frequency BurstPFMPWM,
500mA Driving Capability
and build in OVP,OLP,UVLO,OCP, SCP, LEB Etc.
30.0V 15.0V 10.0V CT=3.3nF 1.0V 94% Totem-pole 1000mA DIP-8 SOP-8
55KHz
UC3843G* High Performance Current Mode PWM Controllers
For Power Saving
Single End, Hopping Technology & Frequency BurstPFMPWM,
500mA Driving Capability
and build in OVP,OLP,UVLO,OCP, SCP, LEB Etc.
30.0V 8.4V 7.6V CT=3.3nF 1.0V 94% Totem-pole 1000mA DIP-8 SOP-8
55KHz
UC2844  High Performance Current Mode PWM Controllers

* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* High current totem pole output
* UVLO with hysteresis
* Low startup and operating current
Single End,Vref=±1%, OCP, SCP, LEB, UVLO Ist=0.3mA(Typ.) 30.0V 16.0V 10.0V 500KHz 1.0V 50% Totem-pole 1000mA SOP-8
UC2845 8.4V 7.6V
UC3844  High Performance Current Mode PWM Controllers

* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* High current totem pole output
* UVLO with hysteresis
* Low startup and operating current
Single End,Vref=±2%, OCP, SCP, LEB, UVLO Ist=0.3mA(Typ.) 30.0V 16.0V 10.0V 500KHz 1.0V 50% Totem-pole 1000mA DIP-8 SOP-8
UC3845 8.4V 7.6V
UC3846 Current Mode PWM Controller

* Built-in under-voltage lockout
* Soft start
* Programmable pulse-by-pulse current limiting
* Improved load response characteristics
* Double pulse suppression
Half Bridge/Push Pull,Vref=±2%, Shutdown,
Soft Start, OCP, SCP, LEB, UVLO,
Sync Teminal
40.0V 7.7V 0.75V 500KHz 1.2V 50% Totem-pole 500mA DIP-16 SOP-16 SOP-16W
*: Under  Development