The NCP12510 is a highly integrated PWM controller capable of

delivering a rugged and high performance offline power supply in a

tiny TSOP−6 package. With a voltage supply range up to 35 V, the

controller hosts a jittered 65−kHz or 100−kHz switching circuitry

operated in peak current mode control. When the power on the

secondary side starts decreasing, the controller 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.

Over Power Protection (OPP) is a difficult exercise especially when

no−load standby requirements drive the converter specifications. The

ON Semiconductor proprietary integrated OPP allows harness the

maximum delivered power without affecting the standby performance

simply via two external resistors. An Over Voltage Protection (OVP)

input is also combined on the same pin and protects the whole circuitry

in case of optocoupler destruction or adverse open loop operation.

Finally, a timer−based short−circuit protection offers the best

protection scheme, allowing precisely select the protection trip point

without caring of a loose coupling between the auxiliary and the power

windings.

NCP12510 is improved and pin compatible controller based on very

popular flyback controller NCP1250.

Features

• Fixed−Frequency 65 kHz or 100 kHz Current−Mode Control

Operation

• Frequency Foldback Down to 26 kHz and Skip−Cycle in Light Load

Conditions

• Frequency Jittering in Normal and Frequency Foldback Modes

• Internal and Adjustable Over Power Protection (OPP) Circuit

• Auto−Recovery Over Voltage Protection (OVP) on the VCC Pin

• Internal and Adjustable Slope Compensation

• Internal Fixed 4 ms Soft−Start

• Auto−Recovery or Latched Short−Circuit Protection

• Pre−Short Ready for Latched OCP Version

• OVP/OTP Latch Input for Improved Robustness

• +300 mA/ −500 mA Source/Sink Drive Capability

• Improved Consumption

• Improved Reset Time in Latch State

• High Robustness and High ESD Capabilities

• EPS 2.0 Compliant

• This is a Pb−Free Device

Typical Applications

• Ac−dc Converters for TVs, Set−top Boxes and DVD Players

• Offline Adapters for Notebooks and Netbooks