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The AX Series is high performance fixed frequency current mode controllers. These integrated circuits feature a trimmed oscillator for precise duty cycle control. A temperature compensated reference, high gain error amplifier, current sensing. Also included are protective features consisting of input and. Page No. Package Code: P. Package Code: S. Absolute Maximum Ratings. P tot. T stg. Supply Voltage low impedance source.
Output Current. Output Energy capacitive load. Analog Inputs pin 2, 3. Error Amplifier Output Sink Current. Storage Temperature Range. Junction Operating Temperature. Lead Temperature soldering 10s. Self Limiting. Thermal Data. Rth j-amb. Thermal Resistance Junction-ambient. Specification No. Block Diagram. Vcc 7. Ground 5. Error AMP. VREF Good. PWM Latch. Pin Connection Top View.
Pin1: Compensation. Pin2: Voltage Feedback. Pin3: Current Sense. Pin5: Ground. Pin6: Output. Pin7: Vcc. Pin8: Vref. This pin is the Error Amplifier output and is made available for. This is the inverting input of the Error Amplifier. A voltage proportional to inductor current is connected to this. The PWM uses this information to terminate the output. The oscillator frequency and maximum output duty cycle are.
Operation to kHz is possible. This pin is the combined control circuitry and power ground. This pin is the positive supply of the control IC.
This is the reference output. It provides charging current for. Download AXP Datasheet. That is specifically designed for Off-Line and DC To DC converter applications offering the designer a costeffective solution with minimal external components.
A temperature compensated reference, high gain error amplifier, current sensing compara-tor, and a high current totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering. A voltage proportional to inductor current is connected to this input. The PWM uses this information to terminate the output switch conduction.
The oscillator frequency and maximum output duty cycle are programmed by connecting resistor RT to Vref and cpacitor CT to ground. Peak currents up to 1A are sourced and sunk by this pin. It provides charging current for capacitor CT through resistor RT.
S3842P Controller. Datasheet pdf. Equivalent
The S, high performance current mode controller, Provides the necessary features to. Internally protection circuity includes. Also other characteristics of internal circuit provide improved line regulation, enhanced load. Ordering Information.
AX3842P Controlers. Datasheet pdf. Equivalent
Usually microcontrollers and digital electronics requires a higher current at lower operating voltages so it becomes important to reduce the induction losses of power supply by making the resistance of the current sensing element as low as possible which is achieved by using a current mode controller. Current mode controllers are highly reliable with fast cycle to cycle current sensing for output short circuit and overload protection, so they can be used for the protection purposes as well. Current mode controllers are being used in digital cameras, Bluetooth devices, cellular phones, auxiliary power supplies. Positive power supply ranging from 2. Output range of the output PWM is 0 to 30 Volts.