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, T_A)
Functional safety-capable, with documentation available to aid functional safety system design
Safety-related certifications
- Planned: 7070V_PK reinforced isolation per DIN EN IEC 60747-17 (VDE 0884-17)
- Planned: 5kV_RMS isolation for 1 minute per UL 1577