DAP018F PDF – PWM Current-Mode Controller

Part Number: DAP018F

Function: PWM Current-Mode Controller

Package: SOIC-14 Pin Type

Manufacturer: ON Semiconductor


DAP018F pinout datasheet


A PWM (Pulse Width Modulation) current-mode controller is a type of control circuit used in power electronics applications to regulate the output current of a power converter or switching power supply. It operates by modulating the width of the pulses in a fixed-frequency square wave signal to control the output current. PWM is a technique where the width of the pulses in a square wave signal is adjusted to control the average power delivered to the load. In a current-mode controller, PWM is used to control the switching of power semiconductor devices (such as MOSFETs) in the power converter.

Housed in a SO−14 package, the DAP018F represents an enhanced version of the currently available Speedking controller, the DAP011. With an internal structure operating at a fixed 65 kHz or 100 kHz frequency, the controller directly connects to the high−voltage rail for a lossless and clean startup sequence. Current−mode control also provides an excellent input audio−susceptibility and inherent pulse−by−pulse control. Internal ramp compensation easily prevents sub−harmonic oscillations from taking place in continuous conduction mode designs. On top of these features, the device takes advantage of the auxiliary winding negative swing to let the user adjust the maximum power the converter can deliver in high line conditions (OPP). When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically freezes the peak current and reduces its switching frequency down to 25 kHz. At this point, if further output power reduction occurs, the controller enters skip−cycle.

The DAP018X features an efficient protective circuitry which, in presence of an overcurrent condition, disables the output pulses while the device enters a safe burst mode, trying to re−start. Once the fault has gone, the device auto−recovers. By implementing a timer to acknowledge a fault condition, independently from the auxiliary supply, the designer’s task is eased when stringent fault mode conditions need to be met. A dedicated input helps triggering a latch−off circuitry which permanently disables output pulses, for instance to implement an over voltage protection (OVP). A separate input accepts a direct NTC connection to ground for a simple and efficient over temperature protection (OTP).


• Fixed−frequency 65 kHz (A and B versions) or 100 kHz (C and D versions) Current−mode Control Operation

• Internal and Adjustable Over Power Protection (OPP) Circuit

• Frequency Foldback down to 25 kHz and Skip−cycle in Light Load Conditions

• Reduced Internal Bias Currents for Improved Standby Performance

• Adjustable Brown−out Protection (B and D versions)

• Internal Ramp Compensation

• Internal Fixed 5 ms Soft−Start […]

DAP018F pdf controller

DAP018F PDF Datasheet