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TC170CPE Arkusz danych(PDF) 1 Page - TelCom Semiconductor, Inc |
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TC170CPE Arkusz danych(HTML) 1 Page - TelCom Semiconductor, Inc |
1 / 8 page 4-119 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 TC170 CMOS CURRENT MODE PWM CONTROLLER FEATURES s Low Supply Current With CMOS Technology ................................. 3.8mA Max s Internal Reference ............................................. 5.1V s Fast Rise/Fall Times (CL = 1000pF) ............. 50nsec s Dual Push-Pull Outputs s Direct-Power MOSFET Drive s High Totem-Pole Output Drive .................... 300mA s Differential Current-Sense Amplifier s Programmable Current Limit s Soft-Start Operation s Double-Pulse Suppression s Undervoltage Lockout s Wide Supply Voltage Operation ............... 8V to16V s High Frequency Operation .......................... 200kHz s Available with Low OFF State Outputs s Low Power, Pin-Compatible Replacement for UC3846 ORDERING INFORMATION Temperature Part No. Package Range TC170COE 16-Pin SOIC (Wide) 0 °C to +70°C TC170CPE 16-Pin Plastic DIP (Narrow) 0 °C to +70°C GENERAL DESCRIPTION The TC170 brings low-power CMOS technology to the current-mode-switching power supply controller market. Maximum supply current is 3.8 mA. Bipolar current-mode control integrated circuits require five times more operating current. The dual totem-pole CMOS outputs drive power MOSFETs or bipolar transistors. The 50nsec typical output rise and fall times (1000pF capacitive loads) minimize MOSFET power dissipation. Output peak current is 300mA. The TC170 contains a full array of system-protection circuits (see features). Current-mode control lets users parallel power supply modules. Two or more TC170 controllers can be slaved together for parallel operation. Circuits can operate from a master TC170 internal oscillator or an external system oscillator. The TC170 operates from an 8V to 16V power supply. An internal 2%, 5.1V reference minimizes external compo- nent count. The TC170 is pin compatible with the Unitrode UC1846/2846/3846 bipolar controller. Other advantages inherent in current-mode control in- clude superior line and load regulation and automatic sym- metry correction in push-pull converters. 5.1-VOLT REFERENCE OSCILLATOR × 3.15 CURRENT AMPLIFIER PWM COMPARATOR POSITIVE FEEDBACK 15 9 10 3 4 7 5 8 6 VIN SYNC (–) CURRENT SENSE INPUT (+) CURRENT SENSE INPUT COMP (+) ERROR AMP INPUT (–) ERROR AMP INPUT ERROR AMPLIFIER 100µA 0.75V LIMIT BUFFER AMPLIFIER Q4 350mV LOCK-UP AMPLIFIER Q3 Q1 Q2 3.5k Ω SHUTDOWN COMPARATOR 350 mV 6k Ω SHUTDOWN CURRENT LIMIT/ SOFT-START ADJUST NOTE: Outputs low in OFF state. 16 1 S S R Q C DQ Q GROUND VDD OUTPUT A ( ) 12 14 11 13 PWM LATCH TC170 VREF 2 – + RO CO VDD + – – + + – + – + – UNDERVOLTAGE LOCKOUT OUTPUT B ( ) TC170-5 10/1/96 FUNCTIONAL BLOCK DIAGRAM |
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