www.DataSheet4U.com
Description
GM384XA series is high performance with fixed-frequency current mode PWM controllers. T...
www.DataSheet4U.com
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 under
voltage 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 Under
voltage Lockout with Hysteresis High Current Totem Pole Output The GM384XA Have Start-up Current 0.17mA
SIMPLIFIED BLOCK DIAGRAM
VCC 7 Vref 8 R R VREF Under
voltage LOCKOUT OSCILLATOR Error Amplifier + Latching PWM 5 Powe...