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TL5001 Datasheet(PDF) 11 Page - Texas Instruments |
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TL5001 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 46 page  + + 3 4 1 2 OSC 8 7 6 5 VDD ISNS Driver GND RC SS COMP FB TPS40200 Soft-Start and Overcurrent 700 mV E/A and SS Reference Enable E/A UVLO GDRV PWM Logic GDRV voltage swing limited to (V IN–8V) UDG-05069 TPS40200 www.ti.com SLUS659G – FEBRUARY 2006 – REVISED NOVEMBER 2014 7 Detailed Description 7.1 Overview The TPS40200 is a non-synchronous controller with a built in 200-mA driver designed to drive high speed P- channel FETs up to 500 kHz. Small size combined with complete functionality makes the part both versatile and easy to use. The controller uses a low-value current-sensing resistor in series with the input voltage and the power FETs source connection to detect switching current. When the voltage drop across this resistor exceeds 100 mV, the part enters an hiccup fault mode at about 2% of the operating frequency. The device uses voltage feedback to an error amplifier that is biased by a precision 700-mV reference. Feed- forward compensation from the input keeps the PWM gain constant over the full input voltage range, eliminating the need to change frequency compensation for different input voltages. The TPS40200 also incorporates a soft-start feature where the output follows a slowly rising soft-start voltage, preventing output-voltage overshoot. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 MOSFET Gate Drive The output driver sinking current is approximately 200 mA and is designed to drive P-channel power FETs. When the driver pulls the gate charge of the FET it is controlling to 8 V, the drive current folds back to a low level so that high-power dissipation only occurs during the turn-on period of the FET. This feature is particularly valuable when turning on a FET at high input voltages where leaving the gate drive current on would otherwise cause unacceptable power dissipation. 7.3.2 Undervoltage Lockout Protection Undervoltage lockout (UVLO) protection ensures proper startup of the device only when the input voltage has exceeded minimum operating voltage. Undervoltage protection incorporates hysteresis which eliminates hiccup starting in cases where input supply impedance is high. Copyright © 2006–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS40200 |
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