UC3843 – Current-Mode PWM Controller 14 Pin IC – (SMD SOP-14 Package)
The UC3842/UC3843/UC3844/UC3845 are fixed frequency current-mode PWM controller. They are specially designed for Off-Line and DC to DC converter applications with minimum external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator and a high current to tempole output for driving a Power MOSFET. The UC3842 and UC3844 have UVLO thresholds of 16V (on) and 10V (off). The UC3843 and UC3845 are 8.5V(on) and 7.9V (off). The UC3842 and UC3843 can operate within 100% duty cycle. The UC3844 and UC3845 can operate with 50% duty cycle.
Features/Specs of UC3843 – Current-Mode PWM Controller 14 Pin IC – (SMD SOP-14 Package):-
- Low Start up Current
- Maximum Duty Clamp
- UVLO With Hysteresis
- Operating Frequency up to 500KHz
- Max Supply Voltage (Vcc): 30V
- Output Current (Io): ±1 A
- Analog Inputs (Pin 2.3) (V(ANA)): -0.3 to 6.3 V
- Error Amp Output Sink Current ISINK (E.A): 10 mA
- Power Dissipation at TA≤25°C (8DIP) PD(Note1,2: 1200 mW
- Power Dissipation at TA≤25°C (8SOP) PD(Note1,2): 460 mW
- Power Dissipation at TA≤25°C (14SOP) PD(Note1,2): 680 mW
- Storage Temperature Range TSTG: -65 ~ +150 °C
- Lead Temperature (Soldering, 10sec) TLEAD: +300 °C
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