© Semiconductor Components Industries, LLC, 2014
June, 2014 − Rev. 2
1 Publication Order Number:
NCP1910/D
NCP1910
High Performance Combo
Controller for ATX Power
Supplies
Housed in a SO−24WB package, the NCP1910 combines
a state-of-the-art circuitry aimed to powering next generation of ATX
or flat TVs converters. With a 65 or 100 kHz Continuous Conduction
Mode Power Factor Controller and a LLC controller hosting
a high-voltage driver, the NCP1910 is ready to power 85+ types of
offline power supplies. To satisfy stringent efficiency considerations,
the PFC circuit implements an adjustable frequency fold back to
reduce switching losses as the load is going light. To cope with all the
signal sequencing required by the ATX and flat TVs specifications, the
controller includes several dedicated pins enabling handshake
between the secondary and the primary sides. These signals include
a power-good line but also a control pin which turns the controller on
and off via an opto coupler. Safety-wise, a second OVP input offers the
necessary redundancy in case the main feedback network would drift
away. Finally, a fast fault input immediately reacts in presence of an
over current condition by triggering an auto-recovery soft-start
sequence.
Features
• Fixed-Frequency 65 or 100 kHz CCM Power Factor Controller
• Average Current-Mode Control for Low Line Distortion
• Dynamic Response Enhancer Reduces Bulk Undershoot
• Independent Over Voltage Protection Sensing Pin with Latch-off
Capability
• Adjustable Frequency Fold Back Improves Light Load Efficiency
• Adjustable Line Brown-Out Protection with 50 ms Delay to Help
Meeting Hold-up Time Specifications
• Programmable Over current Threshold Leads to an Optimized
Sensing Resistor
• ±1 A peak Current Drive Capability
• LLC Controller Operates from 25 kHz to 500 kHz
• On Board 600 V High-Voltage Drivers
• 1 A/0.5 A Sink/Source Capability
• Minimum Frequency Precision Down to ±3% Over
Temperature Range
• Internally Fixed Dead-Time Value of 300 ns
• Adjustable Soft-Start Sequence
• Fast Fault Input with Soft-Start Trigger for Immediate
Auto-recovery Protection
• On/Off Control Pin for Secondary-Based Remote
Control
• On-Board 5 V Reference Voltage for Precise
Thresholds/Hysteresis Adjustments
• Power Good Output Management Signal
• A Version with Dual Ground Pinout (No Skip),
B Version with Single Ground and Skip Operation for
the LLC Controller
• 20 V Operation
• These are Pb-Free Devices
Typical Applications
• Multi Output ATX Power Supplies (A version)
• Flat TVs Power Supplies (B version)
MARKING DIAGRAM
SO−24WB Less Pin 21
DW SUFFIX
CASE 752AB
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 35 of this data sheet.
ORDERING INFORMATION
NCP1910XXX
AWLYYWWG
1
XXXXX = Specific Device Code
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
