DatasheetsPDF.com

OB2298 Dataheets PDF



Part Number OB2298
Manufacturers On-Bright Electronics
Logo On-Bright Electronics
Description PWM Controller
Datasheet OB2298 DatasheetOB2298 Datasheet (PDF)

OB2298 PWM Controller with PFC Standby Control GENERAL DESCRIPTION OB2298 is a highly integrated current mode PWM controller for medium to high power offline flyback converter applications. OB2298 integrates PFC IC power supply control function and shuts down PFC stage at no load or light load conditions. To meet the increasing stringent standby power requirements in light or zero load, OB2298 operates in On-Bright’s proprietary “extended burst mode” without audio noise. Constant power limit is .

  OB2298   OB2298


Document
OB2298 PWM Controller with PFC Standby Control GENERAL DESCRIPTION OB2298 is a highly integrated current mode PWM controller for medium to high power offline flyback converter applications. OB2298 integrates PFC IC power supply control function and shuts down PFC stage at no load or light load conditions. To meet the increasing stringent standby power requirements in light or zero load, OB2298 operates in On-Bright’s proprietary “extended burst mode” without audio noise. Constant power limit is achieved by On-Bright’s proprietary OCP compensation technique where OCP due to CCM and DCM mode difference is compensated in universal AC input applications. OB2298 offers comprehensive protection coverage including Cycle-by-Cycle current limiting, internal Power-On Soft Start, VDD Under Voltage Lockout (UVLO), VDD Over Voltage Protection (OVP), VDD Clamp, Gate Clamp, Over Load Protection (OLP), Over Temperature Protection (OTP), Programmable Brownout Protection, All Pins Floating Protection, and RT Latch triggering feature. In applications where VDD is supplied by auxiliary power supply, the built-in 1 second restart timer can prevent permanent OLP latch. In other applications, this restart timer will not be triggered. To achieve good EMI performance, On-Bright’s proprietary built-in frequency shuffling is provided, also with soft switching control at the totem pole gate drive output. OB2298 is offered in SOP-8 and DIP-8 packages. FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ TYPICAL APPLICATION O nB ©On-Bright Electronics -1- rig ht C on f id en t APPLICATIONS Offline AC/DC flyback converter for ■ Laptop Power Adaptor ■ LCD Monitor Power ■ LCD TV Power and Home Appliance Power ■ Printer Power ■ Lighting Power ia Direct Control of PFC Programmable Brownout Protection Internal 4ms Power On Soft Start Time Internal Restart Timer Pin Floating Protection Proprietary Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design Built-in Frequency Shuffling for Better EMI Built-in Leading Edge Blanking Proprietary OCP Compensation for Universal AC Input Range Low Startup Current(5uA) and Low Operating Current (2.3mA) Built-in Synchronized Slope Compensation 1.0A Peak Current Driving Capability Audio Noise Free Operation Convenient High and Low Triggering Level Latch Off Function lt o Bo na Confidential OB_DOC_DS_9800 Free Datasheet http://www.datasheet4u.com/ OB2298 PWM Controller with PFC Standby Control GENERAL INFORMATION Pin Configuration The pin map of OB2298 in DIP8 and SOP8 package is shown as below. Package Dissipation Rating Package DIP8 SOP8 RθJA (°C/W) 90 150 PFCVCC 1 8 VDD BO 2 7 GATE RT 3 6 GND . O nB ©On-Bright Electronics -2- rig ht C on f id en t Ordering Information Part Number Description OB2298AP DIP8, Pb-free OB2298CP SOP8, Pb-free OB2298CPA SOP8, Pb-free in Taping ratings” may cause permanent damage to the device. These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability. ia lt FB 4 5 CS Absolute Maximum Ratings Parameter Value VDD Zener Clamp Voltage 30 V VDD Clamp Continuous 10 mA Current BO Input Voltage -0.3 to 7V RT Input Voltage -0.3 to 7V FB Input Voltage -0.3 to 7V CS Input Voltage -0.3 to 7V Min/Max Operating Junction -20 to 150 oC Temperature TJ Min/Max Storage Temperature -55 to 150 oC Tstg Lead Temperature (Soldering, 260 oC 10secs) Note: Stresses beyond those listed under “absolute maximum o Bo na Confidential OB_DOC_DS_9800 Free Datasheet http://www.datasheet4u.com/ OB2298 PWM Controller with PFC Standby Control Marking Information TERMINAL ASSIGNMENTS Pin Num 1 Pin Name PFCVCC I/O P 2 BO I/O 3 RT I 4 5 6 7 8 FB CS I O nB ©On-Bright Electronics -3- rig GND GATE VDD ht I P O P Description This pin is directly connected to the VDD pin (Pin 8) via a low impedance switch. During the startup sequence, the switch is off thus the power supply to PFC stage. As soon as the aux. winding is stabilized. The switch is on and provides power supply to the PFC controller. It goes down at No/Light load or fault conditions. Connected a resistor divider from line voltage to this pin to detect line voltage. If this pin drops below 1.05V and lasts 100ms, PWM output will be disabled. When brownout is triggered, this pin will disable an internal current for brownout hysteresis programming. Temperature sensing input pin. Connected to a NTC resistor to GND. Once the voltage of the RT pin drops below a fixed limit of 1.05V, PWM output will be disabled. When this pin is above 4.0V or below 0.6V, the PWM controller is latched shutdown. Feedback input pin. PWM duty cycle is determined by the voltage level into this pin and current sense signal level at Pin 5. Current sense input pin. Connected to MOSFET current se.


ZR38600 OB2298 SI3242P


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)