STMicroelectronics A6983I Iso-Buck Converter

STMicroelectronics A6983I Iso-Buck Converter is specifically created for isolated buck topology. The primary output voltage on the A6983I can be accurately adjusted, whereas the isolated secondary output is derived using a given transformer ratio. No optocoupler is required. The primary sink capability up to 4.5A (even during soft-start) permits a proper energy transfer to the secondary side and allows a tracked soft-start of the secondary output. The control loop supports a peak current mode architecture, and the STM A6983I operates in forced PWM. The 390ns blanking time filter oscillations generated by the transformer leakage inductance make the solution more robust.

The compact QFN-16 (3mm x 3mm) package and the internal compensation of the A6983I help minimize the design complexity and size. The switching frequency can be programmed in the 200kHz to 1MHz range with an optional spread spectrum for improved EMC.

Features

AEC-Q100 qualified
Operating temperature range of -40°C to +150°C for T_j
Designed for iso-buck topology
3.5V to 38V operating input voltage
Load dump tolerant up to 40V
Primary output voltage regulation, no optocoupler required
4.5A source/sink peak primary current capability
Peak current mode architecture in forced PWM operation
390ns blanking time
25μA operating quiescent current
200kHz to 1MHz programmable switching frequency, stable with low ESR capacitor, min 2µF

Internal compensation network
2μA shutdown current
Internal soft-start
Enable pin
Overvoltage protection
Output voltage sequencing
Thermal protection
Optional spread spectrum for improved EMC
Power Good
Synchronization to the external clock
QFN-16 (3mm x 3mm) package

Applications

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

STMicroelectronics A6983I Iso-Buck Converter

Features

Applications

Block Diagram

Typical application circuit

Iso-buck general schematic

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