CS52843 Datasheet | onsemi

features to implement off- line fixed frequency current- mode control with a minimum number of external ponents. The CS52843 incorporates a new precision temperature- controlled oscillator to minimize variations in frequency. An undervoltage lockout ensures that VREF is stabilized before the output stage is enabled. In the CS52843 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. http://onsemi. 8 1 SO- 8 D SUFFIX CASE 751 - - - - - - - - - Features Optimized for Off- Line Control Internally Temperature pensated Oscillator VREF Stabilized before Output Stage is Enabled Very Low Start- Up Current 300 μA (typ) Pulse- by- Pulse Current Limiting Improved Undervoltage Lockout Double Pulse Suppression 2.0% 5.0 Volt Reference High Current Totem Pole Output 14 1 SO- 14 D SUFFIX CASE 751A PIN CONNECTIONS AND MARKING DIAGRAMS P VFB Sense OSC 1 52843 ALYWX 1 CS52843 AWLYWW 14 VREF VCC VOUT GND P NC VFB NC Sense NC OSC A WL, L YY, Y WW, W VREF NC VCC VCC Pwr VOUT Pwr GND GND = Assembly Location = Wafer Lot = Year = Work Week ORDERING INFORMATION Device CS52843ED8 CS52843EDR8 CS52843ED14 CS52843EDR14 Package SO- 8 SO- 8 SO- 14 SO- 14 Shipping 95 Units/Rail 2500 Tape & Reel 55 Units/Rail 2500 Tape & Reel © Semiconductor ponents Industries, LLC, 2006 July, 2006 - Rev. 4 Publication Order Number: CS52843/D VCC Undervoltage Lockout VCC Pwr 34 V GND 8.4 V/7.6 V Set/ Reset 5.0 Volt Reference VREF Internal Bias VFB Error Amplifier R 2.50 V - Oscillator S R R Sense 1.0 V Current Sensing parator PWM Latch Pwr GND 2R + OSC OUTPUT ENABLE R NOR VOUT Figure 1. Block Diagram MAXIMUM RATINGS- Rating Supply Voltage (ICC < 30 m A) Supply Voltage (Low Impedance Source) Output Current Output Energy (Capacitive Load) Analog Inputs...