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CS3842BGD8 Datasheet(PDF) 1 Page - ON Semiconductor |
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CS3842BGD8 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 8 page 1 Features s Very low Start Up Current (300µA typ) s Optimized Off-line Control s Internally Trimmed, Temperature Compensated Oscillator s Maximum Duty-cycle Clamp s VREF stabilization before Output Enable 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 Very Low Start Up Current CS3842B/CS3843B Description Block Diagram Absolute Maximum Ratings 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 14L SO Narrow December, 2001 - Rev. 4 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 CS384XB provides all the neces- sary features to implement off-line fixed frequency current-mode control with a minimum number of external components. The family has been opti- mized for very low start up current (300µA, typ). The CS384XB family incorporates a precision temperature-controlled oscil- lator with an internally trimmed dis- charge current to minimize variations in frequency. A precision duty-cycle clamp eliminates the need for an exter- nal oscillator when a 50% duty-cycle is used. Duty-cycles of almost 100% are possible. On board logic ensures that VREF is stabilized before the output stage is enabled. Ion-implant resistors provide tighter control of undervoltage lockout. Other features include pulse-by-pulse current limiting, and a high-current totem pole output for driving capaci- tive loads, such as the gate of a power MOSFET. The output is LOW in the off state, consistent with N-channel devices. These ICs are available in 8 and 14 lead surface mount (SO) and 8 lead PDIP packages. 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 VCC Gnd OSC VFB COMP Sense VREF VOUT Output Enable 5V Reference Internal Bias NOR S R PWM Latch Current Sense Comparator Oscillator 1 V R 2 R VC Error Amplifier + – 2.50V Set/ Reset Undervoltage Lock-out Circuit 34V ( ) Indicates CS-3843B 16V/10V (8.4V/7.6V) VCC Pwr Pwr Gnd REF |
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