Texas Instruments TPSI31P1-Q1 Active Pre-Charge Controller
Texas Instruments TPSI31P1-Q1 Active Pre-Charge Controller is designed to be used in automotive pre-charge systems as an alternative to traditional passive pre-charge architectures that typically include costly electromechanical relays (EMR), along with bulky, high-power resistors. The TPSI31P1-Q1, combined with external power switches, a power inductor, and a diode, forms an active pre-charge solution. The inductor current is continuously monitored and controlled in a hysteretic mode of operation by the TPSI31P1-Q1 to charge the large capacitance of the downstream system linearly. The TPSI31P1-Q1 is an isolated switch driver that generates its own secondary bias supply from power received on its primary side; therefore, no isolated secondary supply is required. With a gate drive voltage of 17V with 1.5A and 2.5A peak source and sink current, a large availability of power switches, including SiC FET and IGBT, can be used.
The Texas Instruments TPSI31P1-Q1 integrates a communication back-channel that transfers status information from the secondary side to the primary side via open-drain output, PGOOD (Power Good), and indicates when the secondary power is valid. The TPSI31P1-Q1 reinforced isolation is extremely robust with lower power consumption, much higher reliability, and increased temperature ranges than those found in optocouplers. Replacing the EMR and power resistor with a solid-state solution can reduce cost and form factor, while providing higher reliability. A typical application for this device is a battery management system.
Features
- Replaces large, high-power pre-charge resistors using a switched converter architecture
- Improved thermal performance compared to passive pre-charge solutions
- Hysteretic current control for linear charging of downstream capacitance
- Drives external power transistors such as Si, SiC MOSFET, or IGBT
- Integrated isolated secondary supply for gate bias
- 17V gate drive, 1.5A and 2.5A peak source and sink current
- AEC Q-100 qualified for automotive applications withg a temperature grade 1 (–40°C to +125°C, TA)
- Functional safety-capable, with documentation available to aid functional safety system design
- Safety-related certifications
- Planned: 7070VPK reinforced isolation per DIN EN IEC 60747-17 (VDE 0884-17)
- Planned: 5kVRMS isolation for 1 minute per UL 1577
Functional Block Diagram
Development Tool
Texas Instruments TPSI31PxQ1EVM Evaluation Module
Facilitates the evaluation of the TPSI31Px-Q1 iso switch driver with an integrated 17V gate supply.