TO-247 4pin package

Überblick

A new innovative package using Kelvin source concept

With new generations of power switches becoming faster and faster, the effect of the parasitic elements of package and board limit more and more the overall system performance. An effective measure to overcome this problem is to provide an additional connection to the source (Kelvin connection), that is used as a reference potential for the gate driving voltage, thereby eliminating the effect of voltage drops over the source inductance. The achievable efficiency improvement, resulting from faster switching transients, can in fact be significant.

Infineon offers the TO-247 4-pin in conjunction with the 600 V and 650 V CoolMOS™ C7 superjunction (SJ) MOSFETs. With the 600 V CoolMOS™ P6 SJ MOSFET Infineon introduces an improved version of the standard TO-247 4-pin package. The TO-247 4-pin with asymmetric leads comes along with increased creepage distance between the critical leads and enables smoother wave soldering and reduced board yield loss.

Features, benefits & applications

Features	Benefits	Applications
4^th pin capability enables Kelvin source connection Increased creepage distance between high voltage pins Gate signal optimization Asymmetric leads increase critical pin distance	Reduces parasitic source inductance effects on the gate circuit enabling faster switching and increased efficiency Using benefits of Kelvin source efficiency to increase MOSFET R_DS(on) and reduce BOM cost Creepage distance meets 5000m altitude requirement Easier to design by customer Enabling simplified wave soldering and improved board yield loss	Telecom Server Solar Industrial

Benefits in efficiency of 4-pin versus 3-pin variants

Performance gain of 0.6% full load efficiency can be achieved if the same die is used in a 4-pin versus a 3-pin package.

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Lower full load losses with 4-pin part allow for next ‘smaller’ MOSFET (60mΩ instead of 45mΩ), enabling a BOM cost reduction with better low load efficiency.

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TO-247 4-pin package offers higher efficiency by means of a dedicated source-sense pin

Parasitic source inductance counteracts drive voltage

Separate pin “source-sense” (Kelvin source) delivering an undisturbed signal to the driver
Up to 3x lower switching losses lead to
- Higher efficiency
- Cost reduction potential in application

600 V CoolMOS™ P7 with improved version of the standard TO-247 4-pin package

With 600 V CoolMOS™ P7 Infineon introduces an improved version of the standard TO-247 4-pin package.

The TO-247 4-pin with asymmetric leads comes along with increased creepage distance between the critical leads and enables smoother wave soldering and reduced board yield loss.

PFC application with TO-247 4-pin

Isolated driver 1EDI60N12AF like for high side switch setup enables the floating of the kelvin source
No displacement current in the control circuit due to the isolation of the driver
Flexible driver supply: isolated and none isolated can be used

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Kelvin source pin oscillates due to induced voltage spike on source inductance referring to power ground
MOSFET can be seen like high side switch in half bridge
Primary to secondary driver isolation eliminates impact to gate signal