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Product Variant Information section
Product Specification Section
Pricing Section

Stock: 1,957

On Order: 0
Factory Stock:Factory Stock: 200,000
Factory Lead Time: 10 Weeks
Minimum Order: 1
Multiple Of: 1
Quantity Web Price
1 $0.47
100 $0.375
250 $0.355
1,000 $0.335
2,500+ $0.32


Attributes Table
Supply Current-Max 17mA
Supply Voltage 30V
Frequency-Max 500kHz
Input Voltage 2.58V
Topology Boost/Flyback
Rated Power 1.25W
Duty Cycle-Min 0%
Duty Cycle-Max 50%
Operating Temp Range -40°C to +150°C
Storage Temperature Range -65°C to +150°C
Output Current 1mA
Thermal Resistance 100°C/W
Features and Applications

The UC3845BN is of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5 A.

A precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the offstate.


  • Trimmed Oscillator for Precise frequency Control
  • Oscillator Frequency Guaranteed at 250 Hz
  • Current Mode Operation to 500 kHz
  • Automatic Feed Forward Copensation
  • Latching PWM for Cycle-by-cycle Current Limiting
  • Internally Trimmed Reference with Undervoltage lockout
  • High Current totem pole output Undervoltage Lockout With Hystersis
  • Low Start-up and Operating Current