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OB2283 Dataheets PDF



Part Number OB2283
Manufacturers On-Bright Electronics
Logo On-Bright Electronics
Description High Performance Current Mode PWM Controller
Datasheet OB2283 DatasheetOB2283 Datasheet (PDF)

OB2283 High Performance Current Mode PWM Controller GENERAL DESCRIPTION OB2283 is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications. PWM switching frequency at normal operation is internally fixed and is trimmed to tight range. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss. Lower standby power and higher conversion efficiency is thus.

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OB2283 High Performance Current Mode PWM Controller GENERAL DESCRIPTION OB2283 is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications. PWM switching frequency at normal operation is internally fixed and is trimmed to tight range. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss. Lower standby power and higher conversion efficiency is thus achieved. VCC low startup current and low operating current contribute to a reliable power on startup and low standby design with OB2283. OB2283 offers comprehensive protection coverage with auto-recovery including Cycle-byCycle current limiting (OCP), over load protection (OLP), and VCC under voltage lockout (UVLO). It also provides the protections with latched shut down including over temperature protection (OTP), and over voltage protection (OVP). Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique. The tone energy at below 25KHz is minimized in the design and audio noise is eliminated during operation. OB2283 is offered in SOT23-6 package. APPLICATIONS Offline AC/DC flyback converter for ■ Printer, Storage power supply ■ Power Adapter FEATURES ■ Power on soft start reducing MOSFET Vds stress ■ Frequency shuffling for EMI ■ Extended burst mode control for improved efficiency and low standby power design ■ Audio noise free operation ■ Peak load operation with increased frequency ■ Comprehensive protection coverage o VCC Under Voltage Lockout with hysteresis (UVLO) o VCC Over Voltage Protection (VCC OVP) o Cycle-by-cycle over current threshold setting for constant output power limiting over universal input voltage range o Over Load Protection (OLP) with autorecovery o External (if NTC resistor is connected at PRT pin)or internal Over Temperature Protection (OTP) with latched shut down o Output Over Voltage Protection(Output OVP) with latched shut down, and the OVP triggered voltage can be adjusted by the resistor connected between auxiliary winding and PRT pin o Output diode short protection with autorecovery o GND open protection with auto-recovery TYPICAL APPLICATION AC IN EMI Filter OB2283 6 FB VCC 1 5 PRT CS 2 4 GND GATE 3 Vaux DC Out ©On-Bright Electronics Confidential -1- Preliminary Datasheet OB_DOC_DS_228300 OB2283 High Performance Current Mode PWM Controller GENERAL INFORMATION Pin Configuration VCC CS Gate 1 2 3 6 FB 5 PRT 4 GND Ordering Information Part Number OB2283MP Description SOT23-6, Pb-free in T&R Package Dissipation Rating Package RJA(℃/W) SOT23-6 200 Recommended operating condition Symbol Parameter Range VCC VCC Supply Voltage 12 to 28V TA Operating Ambient Temperature -20 to 85 ℃ Absolute Maximum Ratings Parameter Value VCC DC Supply Voltage FB Input Voltage VOVP-1V -0.3 to 7V CS Input Voltage -0.3 to 7V PRT Input Voltage -0.3 to 7V Min/Max Operating Junction Temperature TJ -40 to 150 ℃ Min/Max Storage Temperature Tstg -55 to 150 ℃ Lead Temperature (Soldering, 10secs) 260 ℃ Note: Stresses beyond those listed under “absolute maximum 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. OB2283 X X High Performance Current Mode PWM Controller Package Package Pb-free M:SOT23-6 P:Pb-free Marking Information 83YWW S . ZZZ ©On-Bright Electronics Y:Year Code WW:Week Code(01-52) s: Internal code ZZZ: Lot code Confidential -2- Preliminary Datasheet OB_DOC_DS_228300 OB2283 High Performance Current Mode PWM Controller TERMINAL ASSIGNMENTS Pin Name VCC CS Gate GND PRT FB I/O Description P Power Supply I Current sense input O Totem-pole gate driver output for power MOSFET P Ground Dual functions pin. Connecting a NTC resistor to ground for OTP detection. I Connecting a resistor from Vaux can adjust OVP trigger voltage. If both OTP and OVP are needed, a diode should be connected between PRT pin and the NTC resistor. I Feedback input pin. The PWM duty cycle is determined by voltage level into this pin and the current-sense signal at Pin CS. ©On-Bright Electronics Confidential -3- Preliminary Datasheet OB_DOC_DS_228300 FUNCTIONAL BLOCK DIAGRAM OB2283 High Performance Current Mode PWM Controller OVP OVP SQ R Logic Control Soft Driver UVLO Vref& Iref GND open Temp sense EX OTP AVDD Internal blocks OSC Diode short OLP OCP Comparator PK/Green/ Burst PWM Comparator Timer OTP OVP Latch EX OVP Diode short Diode short compSelonpseation Vocp OLP LEB AVDD ©On-Bright Electronics Confidential -4- Preliminary Datasheet OB_DOC_DS_228300 OB2283 High Performance Current Mode PWM Controller ELECTRICAL CHARACTE.


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