Description
GM384XA series is high performance with fixed-frequency current mode PWM controllers. They are specially designed for off-Line and DC-to-DC converter applications. They require minimal external components to precisely tailor performance in a wide variety of applications.
GM384XA series includes a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, high gain error amplifier, a current-sensing comparator, and a high-current totem pole output for driving a power MOSFET.
On-chip protection features include undervoltage lockouts with hysteresis for both input and reference, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering. All these are in a simple DIP-8 or SOP-8 package!
GM3842A and GM3844A have UVLO thresholds of 16V (on)/10V(off); GM3843A and GM3845A have UVLO thresholds of 8.4V (on)/ 7.6V (off). GM3842A and GM3843A operate within 100% duty cycle; GM3844A and GM3845A operate within 50% duty cycle.

FEATUREs
♦ Low Start-Up and Operating Current
♦ Automatic Feed Forward Compensation
♦ Current Mode Operating Frequency up to 500kHz
♦ Trimmed Oscillator Discharge Current for
♦ Precise Duty Cycle Control
♦ Latching PWM for Cycle-By-Cycle Current Limiting
♦ Undervoltage Lockout with Hysteresis
♦ High Current Totem Pole Output
♦ The GM384XA Have Start-up Current 0.17mA