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NCP4353 Datasheet(PDF) 1 Page - ON Semiconductor |
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NCP4353 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 17 page © Semiconductor Components Industries, LLC, 2015 April, 2015 − Rev. 4 1 Publication Order Number: NCP4353/D NCP4353, NCP4354 Secondary Side SMPS OFF Mode Controller for Low Standby Power The NCP4353/4 is a secondary side SMPS controller designed for use in applications which require extremely low no load power consumption. The device is capable of detecting “no load” conditions and entering the power supply into a low consumption OFF mode. During OFF mode, the primary side controller is turned off and energy is provided by the output capacitors thus eliminating the power consumption required to maintain regulation. During OFF mode, the output voltage relaxes and is allowed to decrease to an adjustable level. Once more energy is required, the NCP4353/4 automatically restarts the primary side controller. The NCP4353/4 controls the primary side controller with an “Active OFF” signal, meaning that it drives optocoupler current during OFF mode to pull−down the FB pin of the primary controller. During normal power supply operation, the NCP4353/4 provides integrated voltage feedback regulation, replacing the need for a shunt regulator. The A versions include a current regulation loop in addition to voltage regulation. Feedback control as well as ON/OFF signal can be provided with only one optocoupler. The NCP4354 includes a LED driver pin implemented with an open drain MOSFET driven by a 1 kHz square wave with a 12.5% duty cycle when primary side is in regulation for indication purpose. The NCP4353 is available in TSOP−6 package while the NCP4354 is available in SOIC−8 package. Features • Operating Input Voltage Range: 2.5 V to 36.0 V • Supply Current < 100 mA • ±0.5% Reference Voltage Accuracy (TJ = 25°C) • Constant Voltage and Constant Current (A versions) Control Loop • Indication LED PWM Modulated Driver (NCP4354x) • Designed for use with NCP1246 Fixed Frequency PWM Controller • These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant Typical Applications • Offline Adapters for Notebooks, Game Stations and Printers • High Power AC−DC Converters for TVs, Set−Top Boxes, Monitors, etc. DEVICE OPTIONS NCP4353A NCP4353B NCP4354A NCP4354B Adjustable Vmin No Yes Yes Yes Current Regulation Yes No Yes No LED Driver No No Yes Yes Package TSOP−6 TSOP−6 SOIC−8 SOIC−8 www.onsemi.com MARKING DIAGRAMS SOIC−8 CASE 751 1 8 XXXXX ALYW G G 1 8 1 XXXAYW G G 1 TSSOP−6 CASE 318G A = Assembly Location L = Wafer Lot Y = Year W = Work Week G = Pb−Free Package See detailed ordering, marking and shipping information in the package dimensions section on page 15 of this data sheet. ORDERING INFORMATION (Note: Microdot may be in either location) |
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