Isolated driver for IGBTs and MOSFETs, to 1200V and 8A drive

May 11, 2016 // By Graham Prophet
Power integrations has combined two previously separate strands of its in-hose technologies to produce an integrated device that marks a departure into a higher voltage/power domain for the company. Its SCALE-iDriver ICs for up to 1200V applications combine reinforced isolation with up to 8 A of current drive.

In 2012 PI acquired Swiss company CT-Concept Technologie (Concept), a specialist in driving high-power semiconductor switches, especially IGBTs. Separately, recent introductions in its lower-power off-line converter ICs have features FluxLink, an isolation/feedback mechanism that is fundamentally a single-turn transformer contained within a single IC package


Combining the two yield these driver ICs; FluxLink is extended to support two-way communication across the isolation barrier (drive waveforms in one direction/fault diagnostics in the reverse diretion). The galvanically isolated single-channel gate driver ICs ranging in output current from 2.5A to 8A – claimed as the highest output current without an external booster. FluxLink technology eliminates the need for opto-electronics and the associated compensation circuitry, thereby enhancing operational stability while reducing system complexity. In addition to combining industry-leading isolation technology, the new gate drivers incorporate advanced system safety and protection features commonly found in medium- and high-voltage applications. The eSOP package, designed to be surface-mounted across the isolation barrier in a power design features 9.5 mm of creepage and a CTI of 600, ensuring substantial operating voltage margin and high system reliability.


SCALE-iDriver single-channel gate driver ICs reduce component count for inverters up to 110 kW, saving space and BOM cost and increasing design flexibility. With the addition of a simple, low-cost booster stage, it is now far quicker to develop efficient, space-saving, reliable inverter designs rated up to 400 kW (15 A). The new devices meet the IEC 60664-1 and IEC 61800-5-1 standards, and operate from -40 °C to +125 °C and at frequencies of up to 250 kHz. They also feature Power Integrations’ Advanced Soft Shut Down (ASSD) mechanism that protects the power semiconductor switch in the event of a short circuit. ASSD is automatically triggered by monitoring desaturation levels (comparing actual power-device surrents with those expected for the amount of drive applied) and requires no extra components.


The company adds,: “SCALE-iDriver ICs will revolutionize gate driver communication