STMicroelectronics L6983I

L6983IQTR is a 38V, 10W synchronous iso-buck converter for isolated applications. It is a device specifically designed for isolated buck topology. The primary output voltage can be accurately adjusted, whereas the isolated secondary output is derived by using a given transformer ratio. No optocoupler is required. The control loop is based on a peak current mode architecture and the device operates in forced PWM. The 390 ns blanking time filters oscillations, generated by the transformer leakage inductance, making the solution more robust. The switching frequency can be programmed in the 200KHz - 1MHz range with optional spread spectrum for improved EMC. The EN pin provides enable/disable functionality. Typical applications are isolated IGBT/SiC MOSFET gate drive supply, OBC (on-board charger) for HEV/EV, electric traction systems.

Key features

• Designed for iso-buck topology
• 3.5V to 38V operating input voltage
• Primary output voltage regulation / no optocoupler required
• Peak current mode architecture in forced PWM operation
• 200KHz to 1MHz programmable switching frequency. Stable with low ESR capacitor: min 2µF
• Internal compensation network, internal soft-start
• Overvoltage protection, output voltage sequencing, thermal protection
• Power good, synchronization to external clock
• QFN16 package
• Operating temperature range from -40°C to 150°C

Applications

• Isolated IGBT/SiC MOSFET gate drive supply
• OBC (On-board charger) for HEV/EV
• Electric traction systems

Available tools

STEVAL-L6983IV1:

38V, 10W synchronous iso-buck converter evaluation board based on L6983I

The STEVAL-L6983IV1 is an evaluation board based on ST L6983I, 38 V, 10 W synchronous iso-buck converter designed for isolated applications. The primary output voltage can be accurately adjusted, whereas the isolated secondary output is derived by using a given transformer ratio. No optocoupler is required.

Data brief

Video

EW24: DC/DC buckboost isolated gate drivers supply