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450V MOSFETs for CFL
STS1DNC45 and STQ1NC45R-AP
 
MOSFETs for CFL Following the worldwide need to conserve energy the compact flourescent market continues to grow rapidly. In many low cost solutions manufacturers are choosing simple self-oscillating circuits that use popular power bipolar devices, such as the STBV or BUL series. However, in applications using drivers such as L6569, MOSFETs are chosen because they are a more effective solution.
Our devices offer a high level of efficiency compared to traditional ones, as well as low cost without sacrificing performance or reducing lifetime. ST already has a strong position with major customers and new devices are being introduced in order to maintain our leadership in this section.

New Industry Standards

Due to the increase in silicon efficiency in the NK series, (SuperMESH) the RDS(on)* area in the “NK” series has been reduced. This means that both RDS(on) and the silicon area can be reduced, with consequent lower power dissipation.

The New 450V MOSFET Series
The new MOSFETs for CFL at 450V are the STS1DNC45 in a double island version of SO-8 for surface mounting, and the STQ1NC45R-AP in TO-92. They join the performance of the NK series at 450V devices also with the flexibility of small packages.

450V MOSFET Electrical Parameters
P / N Mains
(V)		 Package RDS(on)
(ohm)
max		 BVDSS
(V)		 Total Dissipation @ Tc = 25°C
STS1DNC45 220 SO-8* 4.5 450 <2W
STQ1NC45R-AP 220 TO-92 4.5 450 <3.5W
* Double island

Benefits
Cost saving solution
Board Space saving (one package less with the STS1DNC45)
Lamp size can be reduced
With the SMD SO-8 package the assembly can be improved.

STQ1NC45R-AP Features
Typical RDS(on) = 4.1ohm
Extremely high dv/dt capability
100% avalanche tested
New high voltage benchmark
Gate charge minimized
TO-92

STQ1NC45R-AP Features
Typical RDS(on) = 4.1ohm
Tight threshold voltage: (2.3V - 3.7V)
Standard outline for easy automated surface mount assembly

MOSFET - CFL schematic using two STQ1NC45R-AP
CFL schematic using two STQ1NC45R-AP



Other Standard MOSFETs Suggested for CFL at 220V Mains Voltage
P / N Mains
(V)		 Package RDS(on)
(ohm)		 BVDSS
(V)		 Technology
STD4NK50Z / -1 220 DPAK / IPAK 2.7 500 SuperMESH
STD5NK50Z / -1 1.5
STD2NC45 / -1 4.5 450

MOSFET - CFL schematic using a double island SO-8 STS1DNC45 bringing improved flexibility and lower costs

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