CS3844 Datasheet | onsemi

features to implement off- line fixed frequency current- mode control with a minimum number of external ponents. The CS3844 family incorporates a new precision temperature- controlled oscillator to minimize variations in frequency. An internal toggle flip- flop, which blanks the output every other clock cycle, limits the duty- cycle range to less than 50%. An undervoltage lockout ensures that VREF is stabilized before the output stage is enabled. In the CS2844/CS3844 turn on occurs at 16 V and turn off at 10 V. In the CS2845/CS3845 turn on is at 8.4 V and turn off at 7.6 V. Other features include low start- up current, pulse- by- pulse current limiting, and a high- current totem pole output for driving capacitive loads, such as gate of a power MOSFET. The output is low in the off state, consistent with N- channel devices. Features - Optimized for Off- Line Control - Temp. pensated Oscillator - 50% Max Duty- Cycle Clamp - VREF Stabilized Before Output Stage Is Enabled - Low Start- Up Current - Pulse- By- Pulse Current Limiting - Improved Undervoltage Lockout - Double Pulse Suppression - 1.0% Trimmed Bandgap Reference - High Current Totem Pole Output http://onsemi. MARKING DIAGRAMS 8 1 8 1 14 1 16 1 DIP- 8 N SUFFIX CASE 626 SO- 8 D SUFFIX CASE 751 CSx84y N AWL YYWW 1 8 384y D ALYW SO- 14 D SUFFIX CASE 751A 1 14 CSx84y D14 AWLYWW 1 16 SO- 16L DW SUFFIX CASE 751G CSx84y DW AWLYYWW 1 x = 2 or 3 y = 4 or 5 A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W = Work Week ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 7 of this data sheet. © Semiconductor ponents Industries, LLC, 2001 June, 2001 - Rev. 3 Publication Order Number:...