The NCP1136 switcher integrates a fixed−frequency peak current

mode controller with a low on−resistance, 800 V MOSFET. Available

in a PDIP−7 package, the NCP1136 offers a high level of integration,

including soft−start, frequency−jittering, short−circuit protection,

thermal shutdown protection, frequency foldback mode and

skip−cycle to reduce power consumption in light load condition, peak

current mode control with adjustable internal ramp compensation and

adjustable peak current set point.

During nominal load operation, the part switches at one of the

available frequencies (65 or 100 kHz). When the output power

demand diminishes, the IC automatically enters frequency foldback

mode and provides excellent efficiency at light loads. When the power

demand reduces further, it enters into a skip mode to reduce the

standby consumption down to no load condition.

Protection features include: a timer to detect an overload or a

short−circuit event with auto−recovery or latch protection, and a

built−in VCC overvoltage protection.

The switcher also provides a jittered 65 kHz or 100 kHz switching

frequency to improve the EMI.

Features

• Built−in 800 V, 2.5 A MOSFET with RDS(on) of 3.7  for NCP1136

• 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 Load

Efficiency

• 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