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CS52845EDR8 データシート(PDF) 1 Page - ON Semiconductor |
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CS52845EDR8 データシート(HTML) 1 Page - ON Semiconductor |
1 / 8 page 1 Features s Optimized for Off-line Control s Temperature Compensated Oscillator s 50% Maximum Duty-cycle Clamp s VREF Stabilized before Output Stage is 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 Package Options Current Mode PWM Control Circuit with 50% Max Duty Cycle CS52845 Description Block Diagram Absolute Maximum Ratings 10 7 14 13 12 8 1 2 3 4 5 6 11 9 COMP NC VFB NC Sense NC OSC VREF NC VCC VCC Pwr VOUT Pwr Gnd Gnd 14L SO Narrow 1 7 8 2 3 4 5 6 COMP VFB Sense OSC VREF VCC VOUT Gnd 8L SO Narrow December, 2001 - Rev. 3 ON Semiconductor 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885–3600 Fax: (401)885–5786 N. American Technical Support: 800-282-9855 Web Site: www.cherry–semi.com The CS52845 provides all the nec- essary features to implement off- line fixed frequency current-mode control with a minimum number of external components. The CS52845 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 CS52845 turn on is at 8.4V and turn off at 7.6V. Other features include low start-up current, pulse-by-pulse current lim- iting, 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. Supply Voltage (ICC<30mA) ..........................................................Self Limiting Supply Voltage (Low Impedance Source)...................................................30V Output Current ...............................................................................................±1A Output Energy (Capacitive Load) .................................................................5µJ Analog Inputs (VFB, VSENSE)...........................................................-0.3V to 5.5V Error Amp Output Sink Current...............................................................10mA Lead Temperature Soldering Reflow (SMD styles only) ...........60 sec. max above 183°C, 230°C peak VCC Gnd COMP OSC Sense VREF VREF Undervoltage Lockout Internal Bias NOR S R PWM Latch Current Sensing Comparator R 2 R 1V Error Amplifier - + 2.50V Set/ Reset VCC Undervoltage Lock-out 34V 8.4V/7.6V R R VFB VCC Pwr VOUT Pwr Gnd Oscillator Toggle Flip-Flop 5.0 Volt Reference |
同様の部品番号 - CS52845EDR8 |
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同様の説明 - CS52845EDR8 |
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