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CS3843AGDR14 Datasheet(PDF) 1 Page - Cherry Semiconductor Corporation |
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CS3843AGDR14 Datasheet(HTML) 1 Page - Cherry Semiconductor Corporation |
1 / 6 page 1 Features VCC Gnd OSC VFB COMP Sense VREF VOUT Output Enable 5V Reference Internal Bias NOR S R PWM Latch Current Sensing Comparator Oscillator 1 V R 2 R VC Error Amplifier + – 2.50V Set/ Reset Undervoltage Lock-out Circuit 34V ( ) Indicates CS-2843A/3843A 16V/10V (8.4V/7.6V) VCC Pwr Pwr Gnd s Optimized for Off-line Control s Internally Trimmed Temperature Compensated Oscillator s 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 Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout CS2842A/CS3842A CS2843A/CS3843A 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, Sense)...........................................................................-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 CS284XA, CS384XA provides all the necessary features to implement off-line fixed frequency current-mode control with a minimum number of external components. The CS384XA family incorporates a new precision temperature-controlled oscillator with an internally trimmed discharge current to minimize varia- tions in frequency. A precision duty- cycle clamp eliminates the need for an external oscillator when a 50% duty- cycle is used. 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 con- trol of undervoltage lockout. 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 the gate of power MOSFET. The out- put is LOW in the off state, consistent with N-channel devices. The CS384XA series of current-mode control ICs are available in 8 and14 lead packages for surface mount (SO) applications as well as 8 lead PDIP packages. A Company ® Rev. 10/23/98 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 |
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