CS2841B Datasheet | Cherry Semiconductor Corporation

Description The CS2841B provides all the necessary features to implement offline fixed frequency current-mode control with a minimum number of external ponents. The CS2841B (a variation of the CS-2843A) is designed specifically for use in automotive operation. The low start threshold voltage of 8.0V (typ), and the ability to survive 40V automotive load dump transients are important for automotive subsystem designs. The CS-2841 series has a history of quality and reliability in automotive applications. The CS2841B incorporates a precision temperature-controlled oscillator with an internally trimmed discharge current to minimize variations in frequency. Duty-cycles greater than 50% are also possible. On board logic ensures that VREF is stabilized before the output stage is enabled. Ion implant resistors provide tighter control of undervoltage lockout. Features s Optimized for Off-line Control s Internally Trimmed Temperature pensated Oscillator s Maximum Duty-cycle Clamp s VREF Stabilized before Output Stage Enabled s Low Start-up Current s Pulse-by-pulse Current Limiting s Improved Undervoltage Lockout s Double Pulse Suppression s 1% Trimmed Bandgap Reference s High Current Totem Pole Output Absolute Maximum Ratings Supply Voltage (Low Impedance Source) 40V Output Current ±1A Output Energy (Capacitive Load) 5µJ Analog Inputs (VFB, Sense) -0.3V to 5.5V Error Amp Output Sink Current 10m A Lead Temperature Soldering Wave Solder (through hole styles only) 10 sec. max, 260°C peak Reflow (SMD styles only) 60 sec. max above 183°C, 230°C peak Block Diagram V CC Undervoltage Lock-out Circuit Set/ 5V Reset Reference 8.0V/7.4V...