|Package | PIN:||VSON (DRC) | 10|
|Temp:||I (-40 to 85)|
- Input Operating Voltage Range: 4.5 V to 18 V
- Up to 20-A Output Currents
- Supports Pre-Biased Outputs
- 0.5%, 591-mV Reference
- Switching Frequency
- TPS40192: 600 kHz
- TPS40193: 300 kHz
- Three Selectable Thermally Compensated Short-Circuit Protection Levels
- Hiccup Restart from Faults
- Internal 5-V Regulator
- High-Side and Low-Side MOSFET ON-resistance (RDS(on)) Current Sensing
- 10-Pin 3 mm × 3 mm SON Package
- Internal 4-ms Soft-Start Time
- Thermal Shutdown Protection at 145°C
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Texas Instruments TPS40192DRCT
TPS40192 and TPS40193 are cost-optimized synchronous buck controllers that operate from4.5 V to 18 V input. These controllers implement a voltage-mode control architecture with theswitching frequency fixed at either 600 kHz (TPS40192) or 300 kHz (TPS40193). The higher switchingfrequency facilitates the use of smaller inductor and output capacitors, thereby providing acompact power-supply solution. An adaptive anti-cross conduction scheme is used to prevent shootthrough current in the power FETs.
Short circuit detection is done by sensing the voltage drop across the low-side MOSFETwhen it is on and comparing it with a user selected threshold of 100 mV, 200 mV or 280 mV. Thethreshold is set with a single external resistor connected from COMP to GND. This resistor issensed at startup and the selected threshold is latched. Pulse-by-pulse limiting (to preventcurrent runaway) is provided by sensing the voltage across the high-side MOSFET when it is on andterminating the cycle when the voltage drop rises above a fixed threshold of 550 mV. When thecontroller senses an output short circuit, both MOSFETs are turned off and a timeout period isobserved before attempting to restart. This behavior provides limited power dissipation in theevent of a sustained fault.