SDC3844

Current Mode PWM Controller Datasheet SDC3842/3843/3844/3845 General Description Features The SDC384X are high performance fixed frequency current-mode PWM controller series. These integrated Tcircuits are optimized for off-line and DC-DC converter Napplications with minimum external components. They Efeature under-voltage lockout (UVLO) circuit with low start-up current, trimmed oscillator for precise duty Mcycle control, current sense comparator providing maximum current limiting and a totem pole output Ustage for increasing output current. In addition, these CICs also feature accurate protection against over-temperature, over-current and maximal output Opower. DThe SDC3842 and SDC3844 have UVLO thresholds of L16V(ON) and 10V(OFF); The corresponding thresholds IAfor SDC3843 and SDC3845 are 8.4V(ON) and 7.6V(OFF). The SDC3842 and SDC3843 can operate approaching T100% duty cycle; SDC 3844 and SDC3845 can operate CONFIDENfrom zero to 50% duty cycle.  Start-up current: 0.15mA  Low line regulation: 4mV  Low load regulation: 4mV  Operating frequency up to 500kHz  High PWM frequency stability over a full temperature range: 2.5%  High PWM frequency stability under a full supply voltage range: 0.2%  Accurate over-temperature  Protection with hysteresis  UVLO with hysteresis  Package: SOP-8, DIP-8 Applications  Off-line converter  DC-DC converter  Voltage adapter  CRT monitor power supply  DVD/STB power supply SDC DIP-8 SOP-8 Figure 1. Package Type December, ...