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CS3845GD8 Arkusz danych(PDF) 1 Page - Cherry Semiconductor Corporation |
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CS3845GD8 Arkusz danych(HTML) 1 Page - Cherry Semiconductor Corporation |
1 / 6 page 1 Features 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 16V/10V (8.4V/7.6V) R R VFB VCC Pwr VOUT Pwr Gnd Oscillator Toggle Flip-Flop 5.0 Volt Reference ( ) indicates CS-2845/3845 s Optimized for Offline Control s Temp. Compensated Oscillator s 50% Max 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 Ref. s High Current Totem Pole Output Package Options Current Mode PWM Control Circuit with 50% Max Duty Cycle CS2844/CS3844 CS2845/CS3845 Description Block Diagram Absolute Maximum Ratings 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 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 1 COMP 2 3 4 VFB Sense OSC VREF VCC VOUT Gnd 8 7 6 5 8 Lead PDIP & SO Narrow 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 14 Lead SO Narrow The CS3844/45 provides all the neces- sary features to implement off-line fixed frequency current-mode control with a minimum number of external components. The CS3844 family incorporates a new precision temperature-controlled oscil- lator to minimize variations in fre- quency. 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 16V and turn off at 10V. In the CS2845/CS3845 turn on is at 8.4V and turn off at 7.6V. Other features include low start-up current, pulse-by-pulse current limit- ing, and a high-current totem pole out- put for driving capacitive loads, such as gate of a power MOSFET. The out- put is low in the off state, consistent with N-channel devices. 16 15 14 13 12 11 11 10 9 1 2 3 4 5 6 7 8 NC NC COMP VFB SENSE OSC NC NC NC VREF VCC VCCPwr VO Gnd Pwr Gnd NC 16 Lead SO Wide Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi.com Web Site: www.cherry-semi.com A Company ® Rev. 3/17/99 |
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