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SuperMESH & MDmesh MOSFETs
A wide product series for lighting applications

 
SuperMESH & MDmesh MOSFETsDesigning a CFL or a HF electronic ballast and choosing the right components can be a difficult challenge for a designer. In fact the choice for the right switching device is driven by the quest for improved efficiency and reliability at lower cost.
Particularly for lighting applications even the dimensions become an important factor. In many cases the need for the best performance in smaller packages is essential. The MOSFET intrinsic parameters related mainly to the efficiency of the application strongly influence the choice of the MOSFET technology to be used: the power switching losses represent MOSFET power consumption in switching. The losses in conduction are strictly related to the RDS(on) of the MOSFET.
The right trade-off between these two variables offers the designer the possibility to minimize the energy dissipation of the lighting application.

Outstanding HV Serie

Contributing actively to the most important lighting players, ST is constantly enhancing its MOSFET performance by upgrading process technologies and renewing product families.

ST offers two different high voltage product series: SuperMESH and MDmesh.


SuperMESH For Lighting

The SuperMESH family is able to join together cost effectiveness, high performance and ruggedness.
Every aspect of the application, including self-oscillating or driven CFL, PFC or half bridge switches for Ballast, can be excellently covered thanks to the very wide range of products and their outstanding features:
Built-in back-to-back Zener diodes between gate and source;
Excellent dv/dt capability.

The availability of BVDSS* fractions like 450V, 550V and 650V devices and dual/complementary pairs like STS1DNC45 make this product series essential to lighting designers. The comparison between our SuperMESH and competition devices in typical
stages such PFC and Half Bridge, highlights better performances at turn-off.

*Value guaranteed at Tc=25°C


MDmesh For Lighting

As efficiency demands rise, the combination of advanced MDmesh process technology with innovative packages provide:
The lowest RDS(on) for minimum power dissipation;
The lowest gate charge for minimum switching losses;
dV/dt shoot-through immunity;
Improved thermal management.

The MDmesh technology is particularly suited to PFC stages of HF Ballast, where it is possible to achieve a reduction of THD (Total Harmonic Distortion) by using smaller devices. Furthermore, the possibility of having the fast diode on-board (FDmesh) enables excellent performances especially in full bridge configurations (i.e. HID). This technology results particularly ideal for PFC stages in HF Ballast or LED drivers, where it is possible to achieve a good reduction of THD (Total Harmonic Distortion) by using smaller devices, with consequent space saving.


MOSFETs Ideal For Lighting

SuperMESH and MDmesh product families are the right designer’s instruments to enhance the application features, increasing performance and reducing as much as possible the energy losses. Comparison between SuperMESH vs. competition in a PFC stage:

Competitor’s IRF830 during turn-off at steady state operation with 186V input voltage
STP9NK50Z during turn-off at steady state operation with 186V input voltage
Competitor’s IRF830 during turn-off at steady state operation with 186V input voltage STP9NK50Z during turn-off at steady state operation with 186V input voltage

Comparison between SuperMESH vs. competition in a HF Ballast half bridge:
Competitor’s IRF730 during turn-off at 220V input voltage
STP5NK50Z during turn-off at 220V input voltage
Competitor’s IRF730 during turn-off at 220V input voltage STP5NK50Z during turn-off at 220V input voltage