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TC170 Dataheets PDF



Part Number TC170
Manufacturers Microchip
Logo Microchip
Description CMOS Current Mode PWM Controller
Datasheet TC170 DatasheetTC170 Datasheet (PDF)

TC170 CMOS Current Mode PWM Controller Features • Low Supply Current With CMOS Technology: 3.8mA Max • Internal Reference: 5.1V • Fast Rise/Fall Times (C L = 1000pF): 50nsec • Dual Push-Pull Outputs • Direct-Power MOSFET Drive • High Totem-Pole Output Drive: 300mA • Differential Current-Sense Amplifier • Programmable Current Limit • Soft-Start Operation • Double-Pulse Suppression • Undervoltage Lockout • Wide Supply Voltage Operation: 8V to 16V • High Frequency Operation: 200kHz • Available with.

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TC170 CMOS Current Mode PWM Controller Features • Low Supply Current With CMOS Technology: 3.8mA Max • Internal Reference: 5.1V • Fast Rise/Fall Times (C L = 1000pF): 50nsec • Dual Push-Pull Outputs • Direct-Power MOSFET Drive • High Totem-Pole Output Drive: 300mA • Differential Current-Sense Amplifier • Programmable Current Limit • Soft-Start Operation • Double-Pulse Suppression • Undervoltage Lockout • Wide Supply Voltage Operation: 8V to 16V • High Frequency Operation: 200kHz • Available with Low OFF State Outputs • Low Power, Pin-Compatible Replacement for UC3846 General Description The TC170 offers maximum supply current of 3.8mA. 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 Section). 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 component count. The TC170 is pin compatible with the Unitrode UC1846/UC2846/UC3846 bipolar controller. Other advantages inherent in current-mode control include superior line and load regulation and automatic symmetry correction in push-pull converters. Applications • Switching Power Supplies • DC/DC Converters • Motor Control Device Selection Table Part Number TC170COE TC170CPE Package 16-Pin SOIC (Wide) 16-Pin PDIP (Narrow) Temp. Range 0°C to +70°C 0°C to +70°C Package Type 16-Pin PDIP (Narrow) SOFT START/ ILIM 1 VREFOUT 2 – I SENSE IN 3 + I SENSE IN 4 + ERROR AMP IN 5 – ERROR AMP IN 6 CMPTR 7 CO 8 9 RO 16 SHDN 15 IN 16-Pin SOIC (Wide) SOFT START/ ILIM VREFOUT – I SENSE IN 1 2 3 4 5 6 7 8 16 15 14 SHDN VIN OUTPUT B VDD GND OUTPUT A SYNC RO TC170CPE DD + I SENSE IN + ERROR AMP IN – ERROR AMP IN CMPTR CO TC170COE 13 12 11 10 9 NOTE: Outputs LOW in "OFF" state. © 2002 Microchip Technology Inc. DS21395B-page 1 TC170 Functional Block Diagram VREF 2 VIN RO CO Sync (–) Current Sense Input (+) Current Sense Input Comp (+) Error Amp Input (–) Error Amp Input 15 5.1-Volt Reference TC170 13 11 9 8 10 3 4 7 VDD 5 6 + – Error Amplifier 350mV Lock-up Amplifier – + Positive Feedback 3.5kΩ Q1 Q2 – 100µA – + x 3.15 Current Amplifier + – 0.75V PWM Comparator S – S Limit Buffer Amplifier + – Q4 Shutdown Comparator 16 + 350 mV 6kΩ Q3 Shutdown PWM Latch 1 Current Limit/ Soft-Start Adjust R Q Oscillator Undervoltage Lockout D Q C Q 14 12 VDD Output A( ) + Output B( ) Ground NOTE: Outputs low in OFF state. DS21395B-page 2 © 2002 Microchip Technology Inc. TC170 1.0 ELECTRICAL CHARACTERISTICS *Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Absolute Maximum Ratings* Supply Voltage ....................................................... 18V Output Voltage ........................................... VDD or 18V Analog Inputs .................................. -0.3V to VS + 0.3V Package Thermal Resistance: SOIC (Wide) θJA ..................................... 105°C/W SOIC (Wide) θJC ....................................... 23°C/W PDIP (Narrow) θJA .................................... 95°C/W PDIP (Narrow) θJC .................................... 55°C/W Operating Temperature Range ............... 0°C to +70°C Storage Temperature Range .............. -65°C to +150°C TC170 ELECTRICAL SPECIFICATIONS Electrical Characteristics: VIN = 16V, RO = 24kΩ, CO = 1nF, TA = 25°C, unless otherwise noted. Symbol Reference Voltage VREF Reference Voltage Line Regulation Load Regulation VRTC Oscillator F VCOSC TCOSC VOS IB VCMRR AVOL BW CMRR PSRR AIAMP VDM VCM VOS IB VTH VIN IL IL Oscillator Frequency Voltage Stability Temperature Stability Input Offset Voltage Input Bias Current Common-Mode Input Voltage Open-Loop Voltage Gain Unity Gain Bandwidth Common-Mode Rejection Ratio Power Supply Rejection Ratio Amplifier Gain Maximum Differential Input Signal Common-Mode Input Voltage Current Limit Offset Voltage Input Bias Current Threshold Voltage Input Voltage Range Minimum Latching Current at Pin 1 Maximum Nonlatching Current at Pin 1 0.3 0 125 50 0.35 0 0.5 60 60 3 3.15 3.3 ≤ 1.1 VDD – 3V 1 1 0.4 VDD 0 70 1.2 35 42 1.1 5 46 1.5 10 ±30 ±1 VDD – 2V kHz %/V % mV nA V dB MHz dB dB V/V V V V nA V V µA µA VCMV = 0V to 14V VIN = 8V to 16V Pin 3 = 0V to 1.1V.


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