OB2365TAP-H

OB2365T High Performance Current Mode PWM Power Switch GENERAL DESCRIPTION FEATURES OB2365T combines a dedicated current mode PWM controller with a high voltage power MOSFET. It is optimized for high performance, low standby power, and cost effective off-line flyback converter applications. At normal load condition, it operates in QR mode in high line input voltage. To minimize switching loss, the maximum switching frequency in QR mode is internally limited to 77 KHz. When the loading goes low, it operates in PFM mode with valley switching for high power conversion efficiency. When the load is very small, the IC operates in ‘Extended Burst Mode’ to minimize the standby power loss. Additionally, in the low line input voltage, the IC operates in fixed frequency (65KHz) CCM mode at the heavy loading. As a result, high conversion efficiency can be achieved in the whole loading range. VDD low startup current and low operating current contribute to a reliable power on startup and low standby design with OB2365T. OB2365T offers comprehensive protection coverage with auto-recovery including Cycle-byCycle current limiting (OCP), over load protection (OLP), VDD under voltage lockout (UVLO), external 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 23KHz is minimized in the design and audio noise is eliminated during operation. OB2365T is offered in DIP8 package. ■ Power on soft start reducing MOSFET Vds stress ■ Multi-Mode Operation 77KHz maximum clamping frequency in QR mode @ Full Load in high line voltage 65KHz minimum clamping frequency in CCM mode @ Heavy Load in low line voltage Valley switching operation @ Green mode Burst Mode @ Light Load & No Load ■ Frequency shuffling for EMI ■ Extended burst mode control for improved efficiency and low standby power design ■ Audio noise free operation ■ Comprehensive protection coverage o VDD Under Voltage Lockout with hysteresis (UVLO) o VDD 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 DEM pin)or internal Over Temperature Protection (OTP) with auto-recovery o Output Over Voltage Protection(Output OVP) with auto-recovery, and the OVP triggered voltage can be adjusted by the resistor connected between auxiliary winding and DEM pin o Output diode short protection with autorecovery APPLICATIONS Offline AC/DC flyback converter for ■ General power supply ■ Power Adapter TYPICAL APPLICATION ©On-Bright Electronics Confidential -1- Preliminary Datasheet OB_DOC_DS_2365T02 OB2365T High Performance Current Mode PWM Power Switch GENERAL INFORMATION Pin Configuration The OB2365T is offered in DIP8 package as shown below. Absolute Maximum Ratings Parameter Drain voltage (off state) VDD voltage PRT input voltage FB input voltage Sense input voltage Min/Max operating junction temperature TJ Min/Max storage temperature Tstg Lead temperature (soldering, 10secs) 2 -40 to 150℃ -55 to 150℃ 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. Ordering Information Part Number Description OB2365TAPDIP8, Halogen-free in tube H Package Dissipation Rating Package DIP8 Value -0.3V to BVdss 29.5V -0.3V to 7V -0.3 to 7V -0.3 to 7V Output Power Table 230VAC±15% Product Adapter1 OB2365T 29W RJA (℃/W) 75 Note: Drain Pin Connected to 100mm PCB copper clad. 85-265VAC Adapter1 24W Notes: Maximum practical continuous power in an adapter design with sufficient drain pattern as a heat sink, at 40℃ ambient. Marking Information ©On-Bright Electronics Confidential -2- Preliminary Datasheet OB_DOC_DS_2365T02