High Performance Current Mode Pwm Controlers
Description
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AX3842P / AX3842S
High Performance Current Mode Pwm Controlers
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 components.
These integrated circuits feature a trimmed oscillator for precise duty cycle control.
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.
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 kHz • Current Mode Operation to 500 kHz • 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
Absolute Maximum Ratings
Symbol Vi Vi IO EO Parameter Supply Voltage (low impedance source) Supply Voltage (Ii<30mA) Output Current Output Energy (capacitive load) Analog Inputs (pin 2, 3) Error Amplifier Output Sink Current Ptot Tstg TJ TL Power Dissipation at Tamb≤25oC 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 uJ V mA mW
o o o
Unit V
C C C
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
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Block Diagram
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