SDC384X ic

       5Desktop Power Supply

       4CRT Monitor Power Supply

       3DVD/STB Power Supply

       2DC-DC Converter

       1Off-line Converter

8 packages: SOP-8, DIP-8  and SOP-14.

7 UVLO with Hysteresis

6 Accurate Over-temperature Protection with Hysteresis

5 High PWM Frequency Stability under a Full Supply Voltage Range: 0.2%

4 High PWM Frequency Stability over a Full Temperature Range: 2.5%

3 Operating Frequency up to 500KHz

    Low Load Regulation : 4mV

2 Low Line Regulation : 4mV

0.2 mASDC3843/5

1 Low Start-up Current:  0.3mASDC3842/4

The SDC3842and SDC3844 have UVLO thresholds of 16V(on) and 10V(off); The corresponding thresholds for SDC3843 and SDC3845 are 8.4 V(on) and7.6V(off).The SDC3842 and SDC3843 can operate approaching 100% duty cycle; SDC3844 and SDC3845 can operate from zero to 50% duty cycle.

The SDC384X are high performance fixed frequency current- mode PWM controller series. These integrated circuits are optimized for off-line and DC-DC converter applications with minimum external components. They feature under-voltage lockout (UVLO) circuit with low start-up current, trimmed oscillator for precise duty cycle control, current sense comparator providing maximum current limiting and a totem pole output stage for increasing output current. In addition, these ICs also feature accurate protection against over -temperature, over-current and maximal output power.

  General Description