FCI UC3845A-BW
The UC3842A-BW/43A-BW/44A-BW/45A-BW 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. The UC3842A-BW and UC3844A-BW have UVLO thresholds of 16 V (on) and 10 V (off).| Part No. | UC3845A-BW |
|---|---|
| Datasheet | UC3845A-BW Download |
| Manufacturer |  FCI |
| Description | Current Mode PWM Controller |
| Buy | Stock & Price |
DESCRIPTION
Internally implemented circuits include a trimmed PIN CONNECTION (TOP VIEW) oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout and current limiting. The corresponding thresholds for the UC3843A-BW/45A-BW are 8.4V (on) and 7.6V (off). The UC3842A-BW and UC3843A-BW can operate within 100% duty cycle. The UC3844A-BW and UC3845A-BW can operate within 50% duty cycle. The UC384XA-BW has Start-Up Current 0.17mA (typ). The UC384XA-BW are revised UC384XAM and differ by higher Unity Gain bandwidth of Error Amplifier.FEATURES
● Low Start-Up and Operating Current● High Current Totem Pole Output
● Undervoltage Lockout With Hysteresis
● Operating Frequency Up To 500KHz BLOCK DIAGRAM (toggle flip flop used only in UC3844, UC3845)
ABSOLUTE MAXIMUM RATINGS
Characteristic S...
