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TC18C46 Fiches technique(PDF) 1 Page - TelCom Semiconductor, Inc |
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TC18C46 Fiches technique(HTML) 1 Page - TelCom Semiconductor, Inc |
1 / 10 page 4-101 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION The TC38C46 is a current mode CMOS PWM control IC. It draws only 2 mA supply current, so it can be driven without a costly 50-60 Hz transformer. The output drive stage is capable of high drive currents, 300mA typical. The TC38C46 is pin compatible with earlier bipolar products so that designers can easily update older designs. A number of improvements have been added. This second generation part has been designed with an isolated drive stage. Unlike its cousin, the TC170, the output stage of the TC38C46 can be run from a separate power supply such as a secondary winding on an output trans- former. This allows for bootstrap start-up of the power supply. CMOS CURRENT MODE PWM CONTROLLER FEATURES s Isolated Output Drive s Low Power CMOS Construction s Low Supply Current ................................. 2mA Typ. s Wide Supply Voltage Operation .............. 8V to 18V s Latch-Up Immunity ................... 500mA on Outputs s Above and Below Rail Input Protection ............. 6V s High Output Drive ................................ 500mA Peak s Current Mode Control s Fast Rise/Fall Time ..................... 50nsec @ 1000pF s High Frequency Operation .......................... 500kHz s UV Hysteresis Guaranteed s Programmable Current Limit s Shutdown Pin Available s Double Ended s Soft Start s Low Prop Delay Current Amp to Output ......................................... < 350nsec Typ. s Low Prop Delay Shutdown to Output ......................................... < 400nsec Typ. s TC38C46Pin Compatible with Unitrode UC3846 s ESD Protected ................................................. ±2 kV + – + – +VS + + – .65V – + + – D Q C Q 100 µA PWM COMPARATOR LIMIT BUFFER AMPLIFIER LOCK-UP AMPLIFIER CURRENT SENSE AMPLIFIER ERROR AMPLIFIER 350mV Q1 Q2 3.5k Ω 350mV 6k Ω SHUTDOWN COMPARATOR SHUTDOWN CURRENT LIMIT SOFT START ADJUST TC38C46 OUTPUTS LOW IN OFF STATE OUTPUT A VDD GROUND OUTPUT B PWM LATCH VIN RT CT SYNC – CURRENT SENSE INPUT + ERROR AMP INPUT – ERROR AMP INPUT + CURRENT SENSE INPUT COMPENSATION Q3 VREF 2 12 14 1 16 11 13 15 9 8 10 3 4 7 5 6 TC18C46 TC28C46 TC38C46 Q4 POSITIVE FEEDBACK + – + – 5.1 VOLT REFERENCE UNDER VOLTAGE LOCKOUT OSCILLATOR S Q S R x3 ORDERING INFORMATION Part No. Configuration Pkg./Temperature TC18C46MJE Non-Inverting 16-Pin CerDIP – 55 °C to +125°C TC28C46EOE Non-Inverting 16-Pin SOIC (Wide) – 40 °C to +85°C TC28C46EPE Non-Inverting 16-Pin Plastic DIP (Narrow) – 40 °C to +85°C TC38C46COE Non-Inverting 16-Pin SOIC (Wide) 0 °C to +70°C TC38C46CPE Non-Inverting 16-Pin Plastic DIP (Narrow) 0 °C to +70°C TC18/28/28/C46-8 9/23/96 TC18C46 TC28C46 TC38C46 |
Numéro de pièce similaire - TC18C46 |
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Description similaire - TC18C46 |
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