UC2842Pulse Width Modulation (PWM) Controllers

The UC284x and UC384x are fixed frequency current mode PWM controller.They are specially designed for OFF Line and DC to DC converter applications with a minimal external components.Internally implemented circuits include a trimmed oscillator for precise duty cycle control,a temperature compensated reference,high gain error amplifier,current sensing comparator,and a high current totem pole output ideally suited for driving a power MOSFET.Protection circuitry includes built under voltage lockout and current limiting. 

The UC2842144,UC3842144 have UVLO thresholds of 16 V (on)and 10 V(off). 

The corresponding thresholds for the UC2843145,UC3843/45 are 8.4V (on) and 7.6V(off). 

The UC2842/43,UC3842143 can operate within 100%duty cycle. 

The UC2844/45,UC3844/45 can operate within 50%duty cycle. 

The UC2842/43/44/45 is characterized for operation from TA=40℃ to 85℃ . 

The UC3842/43/44/45 is characterized for operation from TA=0℃ to 70℃ . 

FEATURES 

Low Start-Up and Operating Current 

High Current Totem Pole Output 

Under voltage Lockout With Hysteresis 

Operating Frequency Up To 500KHz 

UC2842Pulse Width Modulation (PWM) Controllers parameter list

Operating Voltage (Vcc) (v):

30V

Frequency (Hz):

500khz

Power Consumption PD (Typ):

1W

Operating Temperature Range (℃):

0-70°C

Package:

DIP-8 SOP-8

Alternative:

UC2842

• Power supply
• home appliance
• drone
• floor sweeper
• Medical device
• Multimedia audio power amplifier
• LED lighting
• Toy
• robot
• Instruments and meters
• industrial control
• Automotive Electronics

• 
  ICL7660
• 
  KA7500
• 
  TL494
• 
  SG3524
• 
  SG3525
• 
  SG3526
• 
  UC2843
• 
  UC2844
• 
  UC2845
• 
  UC3842
• 
  UC3843
• 
  UC3844
• 
  UC3845
• 
  UC3846