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)