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NCP1253 - Current-Mode PWM Controller

Description

Pin No.

Feedback pin 3 NC Non connected pin 4 CS Current sense + ramp compensation 5 VCC Supplies the controller

The controller ground.

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.
  • Adjustable Ramp Compensation.
  • Internally Fixed 4 ms soft.
  • start.
  • Timer.
  • based Auto.
  • Recovery or Latched Short.
  • Circuit Protection.
  • Frequency Jittering in Normal and Frequency Foldback Modes.
  • Latched OVP on VCC.
  • Up to 28 V VCC Operation.
  • Extremely Low No.

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Datasheet preview – NCP1253

Datasheet Details

Part number NCP1253
Manufacturer onsemi
File Size 396.64 KB
Description Current-Mode PWM Controller
Datasheet download datasheet NCP1253 Datasheet
Additional preview pages of the NCP1253 datasheet.

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Full PDF Text Transcription

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DATA SHEET www.onsemi.com Current-Mode PWM Controller for Off-line Power Supplies NCP1253 The NCP1253 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 supply range up to 28 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 to decrease, 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. To avoid sub harmonic oscillations in CCM operation, adjustable slope compensation is available via the series inclusion of a simple resistor in the current sense signal.
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