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AS2844 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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AS2844 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 20 page  AS2842/3/4/5 Current Mode Controller Description The AS2842 family of control ICs provide pin-for-pin replace- ment of the industry standard UC3842 series of devices. The devices are redesigned to provide significantly improved tolerances in power supply manufacturing. The 2.5 V refer- ence has been trimmed to 1.0% tolerance. The oscillator discharge current is trimmed to provide guaranteed duty cycle clamping rather than specified discharge current. The circuit is more completely specified to guarantee all param- eters impacting power supply manufacturing tolerances. In addition, the oscillator and flip-flop sections have been enhanced to provide additional performance. The RT/CT pin now doubles as a synchronization input that can be easily driven from open collector/open drain logic outputs. This sync input is a high impedance input and can easily be used for externally clocked systems. The new flip-flop topology allows the duty cycle on the AS2844/5 to be guaranteed between 49 and 50%. The AS2843/5 requires less than 0.5 mA of start-up current over the full temperature range. Pin Configuration — Top view Features • 2.5 V bandgap reference trimmed to 1.0% and temperature-compensated • Extended temperature range from - 40 to 105 ° C • AS2842/3 oscillations trimmed for precision duty cycle clamp • AS2844/5 have exact 50% max duty cycle clamp • Advanced oscillator design simplifies synchronization • Improved specs on UVLO and hysteresis provide more predictable start-up and shutdown • Improved 5 V regulator provides better AC noise immunity • Guaranteed performance with current sense pulled below ground • Over-temperature shutdown 8L SOIC (D) 8 1 COMP V REG 7 2 V FB V CC 6 3 I SENSE OUT 5 4 R T/CT GND PDIP (N) 8 1 COMP V REG 7 2 V FB V CC 6 3 I SENSE OUT 5 4 R T/CT GND Ordering Information Description Temperature Range Order Codes 8-Pin Plastic DIP -40 to 105 ° C AS2842/3/4/5N 8-Pin Plastic SOIC -40 to 105 ° C AS2842/3/4/5D-8 ASTEC Semiconductor 37 |
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