OB5269 Datasheet – PWM Controller
High Voltage Green Mode PWM Controller
OB5269 overview
The OB5269 is a High Voltage Green Mode PWM Controller, supplied in an SOP 8 Pin Type package. The absolute maximum ratings table on this page lists the 10 limits from the manufacturer's datasheet that must not be exceeded. This page brings together the OB5269 pinout and maximum ratings, with the full datasheet PDF to preview below or download.
OB5269 is a highly integrated current mode PWM control IC with high voltage start up, optimized for high performance, low standby power consumption and cost effective offline flyback converter applications.
PWM switching frequency at normal operation is internally fixed and is trimmed to a tight range. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss. Very low standby power consumption and very high conversion efficiency is thus achieved.
High voltage startup is implemented in OB5269, which features with short startup time and low standby current.
OB5269 offers complete protection coverage with auto-recovery including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), and VDD under voltage lockout (UVLO). It also provides the protections with latched shut down including over temperature protection (OTP), and over voltage (fixed or adjustable) protection (OVP). Excellent EMI performance is achieved with On- Bright proprietary frequency shuffling technique.
The tone energy at below 22KHZ is minimized to avoid audio noise during operation. OB5269 is offered in SOP8 package.
Datasheet
OB5269 features
- High Voltage Startup
- Power on Soft Start Reducing MOSFET Vds Stress
- Frequency shuffling for EMI
- Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power
- Audio Noise Free Operation
- Fixed 65KHZ Switching Frequency
- Comprehensive Protection Coverage
- VDD Under Voltage Lockout with Hysteresis (UVLO)
- Cycle-by-cycle over current protection (OCP)
- Overload Protection (OLP) with auto- recovery
- Over Temperature Protection (OTP) with latch shut down
- VDD Over voltage Protection (OVP) with latch shut down
- Adjustable OVP through external Zener
OB5269 pinout
| Name | Description |
|---|---|
| 1 | Dual function pin. Either connected through a NTC resistor to ground for over temperature shutdown/latch control or connected through Zener to VDD for adjustable over voltage protection |
| 2 | Feedback input pin. The PWM duty cycle is determined by voltage level into this pin and the current-sense signal at CS pin |
| 3 | Current sense input |
| 4 | Ground |
| 5 | Totem-pole gate driver output for power Mosfet |
| 6 | Power Supply |
| 8 | Connected to the line input or bulk capacitor via resistors for startup |
Absolute maximum ratings
| Parameter | Value |
|---|---|
| VDD DC Supply Voltage | 30V |
| High-Voltage Pin, HV | -0.3 to 500 V |
| VDD Zener Clamp Voltage Note | VDD_Clamp+0.1V |
| VDD DC Clamp Current | 10 mA |
| FB Input Voltage | -0.3 to 7V |
| CS Input Voltage | -0.3 to 7V |
| RT Input Voltage | -0.3 to 7V |
| Min/Max Operating Junction Temperature TJ | -40 to 150 ℃ |
| Min/Max Storage Temperature Tstg | -55 to 160 ℃ |
| Lead Temperature (Soldering, 10secs) | 260 ℃ |
OB5269 applications
- Battery Charger
- Power Adaptor
- Open-frame SMPS
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