All trademarks are the property of their respective owners.
DescriptionThe TPS40190DRCT is a cost-optimized synchronous buck controller that operates from 4.5 V to15 V nominally, and implements a fixed frequency voltage mode power supply. The controller uses anadaptive anti-cross conduction scheme to prevent both the high-side and the rectifier MOSFET to beturned on at the same time, preventing shoot through current in the two MOSFETs.
The controller also provides a short circuit protection threshold that is user selectablebetween one of three values. The protection level is set with a single external resistor connectedfrom COMP to GND. During start-up, the impedance connected to COMP is sensed, and the informationis decoded to select one of the three thresholds. When the controller senses an output shortcircuit, both MOSFETs are turned off and a timeout period is observed before attempting to restart.This provides limited power dissipation in the event of a sustained fault.
The TPS40190DRCT provides strong drivers to minimize switching losses in the power stage,reducing heat build up in the MOSFETs and allowing larger MOSFETs to be used without undueswitching time penalty.
Feature
- Input Operating Voltage Range: 4.5 V to 15 V
- Reference 0.591 V ±1%
- Voltage Mode Control
- Internal 5-V Regulator For Internal Housekeeping, Driver Power and Light ExternalLoads
- Selectable Short-Circuit Protection Thresholds
- Pre-Bias Ouput Safe
- Fixed Switching Frequency of 300 kHz
- Internal Soft Start
- Small 3 mm × 3 mm, 10-Pin SON Package
- Bootstrapped Drivers for N-Channel MOSFET
- Adaptive Anti-Cross Conduction
- Internal Bootstrap Diode
- 1.2-A Drivers for Decreased Switching Loss
All trademarks are the property of their respective owners.
DescriptionThe TPS40190 is a cost-optimized synchronous buck controller that operates from 4.5 V to15 V nominally, and implements a fixed frequency voltage mode power supply. The controller uses anadaptive anti-cross conduction scheme to prevent both the high-side and the rectifier MOSFET to beturned on at the same time, preventing shoot through current in the two MOSFETs.
The controller also provides a short circuit protection threshold that is user selectablebetween one of three values. The protection level is set with a single external resistor connectedfrom COMP to GND. During start-up, the impedance connected to COMP is sensed, and the informationis decoded to select one of the three thresholds. When the controller senses an output shortcircuit, both MOSFETs are turned off and a timeout period is observed before attempting to restart.This provides limited power dissipation in the event of a sustained fault.
The TPS40190 provides strong drivers to minimize switching losses in the power stage,reducing heat build up in the MOSFETs and allowing larger MOSFETs to be used without undueswitching time penalty.
