UC3844BDR2G Switching Controllers ON Semiconductor (Datasheet pdf)

UC3844BDR2G ON Semiconductor

ข้อมูลแบบเข้าใจง่าย (Specification)

Part : UC3844BDR2G
Brand : ON Semiconductor
Description : Switching Controllers 52kHz 1A Current PWM w/48% Duty Cycle Max3
Package : SOIC-14
Topology: Boost, Flyback
Number of Outputs: 1 Output
Switching Frequency: 500 kHz
Duty Cycle - Max: 48 %
Output Voltage: 4.9 V to 5.1 V
Output Current: 1000 mA
Maximum Operating Temperature: + 70 C
Mounting Style: SMD/SMT
Fall Time: 50 ns
Minimum Operating Temperature: 0 C
Operating Supply Voltage: 30 V
Rise Time: 50 ns

คุณสมบัติ (Features) 
- Trimmed Oscillator for Precise Frequency Control
- Oscillator Frequency Guaranteed at 250 kHz
- Current Mode Operation to 500 kHz Output Switching Frequency
- Output Deadtime Adjustable from 50% to 70%
- Automatic Feed Forward Compensation
- Latching PWM for Cycle−By−Cycle Current Limiting
- Internally Trimmed Reference with Undervoltage Lockout
- High Current Totem Pole Output
- Undervoltage Lockout with Hysteresis
- Low Startup and Operating Current
- These Devices are Pb−Free and are RoHS Compliant
- NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q100 Qualified and PPAP Capable

ความของแต่ละขาเป้นอย่างไร (PIN FUNCTION DESCRIPTION)

PIN-8  PIN-14
   1             1     Compensation This pin is the Error Amplifier output and is made available for loop                                 compensation.
   2             3      Voltage Feedback This is the inverting input of the Error Amplifier. It is normally                                connected to the switching power supply output through a resistor divider.
   3             5      Current Sense A voltage proportional to inductor current is connected to this input.                                The PWM uses this information to terminate the output switch conduction.
   4             7       RT/CT The Oscillator frequency and maximum Output duty cycle are programmed                              by connecting resistor RT to Vref and capacitor CT to ground. Oscillator operation                               to 1.0 kHz is possible.
   5                      GND This pin is the combined control circuitry and power ground.
   6            10      Output This output directly drives the gate of a power MOSFET. Peak currents up to                            1.0 A are sourced and sunk by this pin. The output switches at one−half the                                           oscillator frequency.
  7             12      VCC This pin is the positive supply of the control IC.
  8             14       Vref This is the reference output. It provides charging current for capacitor CT                                      through resistor RT.
                   8        Power Ground This pin is a separate power ground return that is connected back to                              the power source. It is used to reduce the effects of switching transient noise on the                              control circuitry.
                 11     VC The Output high state (VOH) is set by the voltage applied to this pin. With a                                      separate power source connection, it can reduce the effects of switching transient                               noise on the control circuitry.
                 9        GND This pin is the control circuitry ground return and is connected back to the                                   powersource ground.
            2,4,6,13  NC No connection. These pins are not internally connected.



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