power management product selection guide - International Rectifier

DC Bus Converter IC | PRODUCT FAMILIES
Features at a Glance
• Optimized IC & MOSFETs for best
electrical and thermal performance
• DC Bus primary side controllers
• +/- 1A gate drive current
• Optimized for IR’s low charge MOSFETs
• Adjustable dead-time (50nsec to 200nsec)
• High & low pulse-width matching
to within +/-25nsec
• Programmable switching frequency
up to 500kHz
• Integrated soft-start
• Vcc supply under-voltage lock-out
• Current limit
IR2085S
• Self-oscillating, 50% duty cycle
design with 100V offset half-bridge driver
in a single 8-pin SOIC package
IR2086S
• Self-oscillating, 50% duty cycle design
with 100V offset full-bridge driver in a
single 16-pin SOIC package
The IR Advantage
• Optimized solution for 2-stage 48V
distributed power architectures
• Dramatic space savings with increased
efficiency versus standard isolated
brick solutions
• Significant component count reduction,
and simplification of design
• Single isolated 48V bus converter to
generate unregulated low output voltage
in 6V-12V range
• Bus voltage can be optimized according
to power level, input voltage range, and
POL switching losses:
– Select higher bus voltage for
higher power systems to reduce
distribution losses
– Select lower bus voltage for reduced
switching losses in the POL
Applications
• 48V input Isolated
DC-DC Converter Applications
– 48V +/-10%
– ETSI (36V-60V)
• Networking and
Telecommunications systems
• 48V Servers & High End Computing
DC Bus Converter Chip Sets: Redefining On-Board Power Management
IR’s DC Bus Converter chip set family is aimed at simplifying and improving on-board power management
for today's networking & communications and high end computing systems. IR’s DC Bus
converter chip sets redefine what was previously possible in standard brick footprints, addressing
power levels up to 350W without having to parallel converters. The Half-Bridge chip set offers
designers up to 95.7% efficiency at 27.5A/8V/220W output, up to 126W/in2 power density in 48%
smaller footprint compared to standard quarter-bricks. The Full-Bridge chip set offers designers up
to 97% efficiency at 35A/9.6V/330W output, up to 142W/in2 power density in a 29% smaller footprint,
compared to standard quarter-bricks. The DC Bus chipset allows for significant component count
reduction up to 60% versus standard full-featured isolated DC-DC brick solutions.
DC Bus Converter Control ICs
Part
Number Description Package TJ
IR2085S
IR2086S
Primary-side
half-bridge
control IC,
fixed 50%
duty cycle,
self-oscillating
Primary-side
half-bridge
control IC,
fixed 50%
duty cycle,
self-oscillating
DirectFET MOSFETs
SO-8
SO-16
-40
to
125°
-40
to
125°
Drive
Current
+/-
1.0A
+/-
1.2A
Adjustable
Deadtime
Fixed
Duty
Cycle
Hiccup
Current
Limit
Soft
Start
Programmable
Frequency
Part # Package V DSS R DS(on) MAX QG QGD
@ VGS=10V Typical Typical
IRF6644 Medium Can 100V 13mΩ 35nC 11.5nC
IRF6655 Small Can 100V 62mΩ 8.7nC 2.8nC
IRF6646 Medium Can 80V 9.5mΩ 36nC 12nC
IRF6613 Medium Can 40V 3.4mΩ 42nC 12.6nC
IRF6614 Small Can 40V 8.3mΩ 19nC 6.0nC
IRF6635 Medium Can 30V 1.8mΩ 47nC 17nC
www.irf.com INTERNATIONAL RECTIFIER / POWER MANAGEMENT SELECTION GUIDE 11