AX3842S Datasheet | Avantics

Description The AX3842 Series is high performance fixed frequency current mode controllers. That is specifically designed for Off-Line and DC To DC converter applications offering the designer a costeffective solution with minimal external ponents. These integrated circuits feature a trimmed oscillator for precise duty cycle control. A temperature pensated reference, high gain error amplifier, current sensing para-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. 8-Lead Plastic DIP-8 Package Code: P - 8-Lead Plastic SO-8 Package Code: S Features - Trimmed Oscillator for Precise Frequency Control - Oscillator Frequency Guaranteed at 250 k Hz - Current Mode Operation to 500 k Hz - Automatic Feed Forward pensation - 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 Absolute Maximum Ratings Symbol Vi Vi IO EO Parameter Supply Voltage (low impedance source) Supply Voltage (Ii<30m A) Output Current Output Energy (capacitive load) Analog Inputs (pin 2, 3) Error Amplifier Output Sink Current Ptot Tstg TJ TL Power Dissipation at Tamb≤25o C Storage Temperature Range Junction Operating Temperature Lead Temperature (soldering 10s) Value 30 Self Limiting ±1 5 -0.3 to 5.5 10 800 -65 to 150 -40 to 150 300 A u J V m A m W o o o Unit V Thermal Data Symbol Rth j-amb Description Thermal Resistance Junction-ambient DIP-8 100 SO-8 150 Units o C/W AVANTICS - AX3842 Series Specification No.: 050308-FE0008 .. Page No. : 2/12 Block Diagram Vcc 7 34V UVLO S/R 5V REF Internal Bias VREF Good Logic T 2R R S R 1V Current Sense parator 6 8 VREF 5V 50m A Ground 5...