Onsemi NCP1129

Description

The NCP1129 switcher offers everything needed to build reliable and compact AC-DC switching power supplies with minimal surrounding elements. Incorporating an avalanche rated 650 V MOSFET, converters built with the NCP1129 can be safely designed for international conditions without jeopardizing the overall reliability.

The NCP1129 implements peak current mode control with adjustable ramp compensation that ensures stability in Continuous Conduction Mode (CCM) operation. With an external resistor, the maximum peak current is adjustable, allowing the designer the ability to inject ramp compensation to stabilize CCM power supplies.

A short circuit fault condition is independently detected from the auxiliary winding voltage resulting in improved short circuit protection with true overload detection. The Source pin provides access to the MOSFET source, allowing for overpower compensation.

With a supply range up to 26 V, the switcher also provides a jittered 65 kHz or 100 kHz switching frequency operated in peak current mode control. When the power on the secondary side starts to decrease, the switcher automatically folds back its switching frequency down to a minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current.

Features

• Built−in 650 V, 1 A MOSFET with RDS(on) of 8.6  for NCP1124
• Built−in 650 V, 1.8 A MOSFET with RDS(on) of 5.4  for NCP1126
• Built−in 650 V, 5.5 A MOSFET with RDS(on) of 2.1  for NCP1129
• Fixed−Frequency 65 or 100 kHz Current Mode Control with Adjustable Internal Ramp Compensation
• Adjustable Current Limit with External Resistor
• Frequency Foldback Down to 26 kHz and Skip−Cycle for Light LoadEfficiency
• Frequency Jittering for EMI Improvement
• Less than 100 mW Standby Power @ High Line
• EPS 2.0 Compliant
• 7−Pin Package Provides Creepage Distance
• These are Pb−Free Devices

Typical applications

• Power supply for DVD, STB, CD-Player, Power Supply
• Aux supply for TV, USB, Appliance

More information

• Datasheet
• IC product information