General Instructions

OB2263 is a highly integrated current mode PWM control IC optimized for high performance, low power consumption

Standby power consumption and cost-effective offline flyback for converter applications below 30W. The PWM switching frequency during normal operation is

Externally programmable and trimmed to narrow ranges. Under no-load or light-load conditions, the IC operates in an extended "burst mode" to minimize switching losses.

Efficiency is achieved with lower standby power consumption and higher slew rate.

VDD low start-up current and low operating current provide reliable power for start-up designs by

OB2263. Therefore, the startup circuit can be used to minimize standby power.

Internal slope compensation improves system large signal stability and reduces possible subharmonics

Oscillation occurs at high PWM duty cycle output. Leading edge blanking on current sense (CS) input

Eliminates signal interference reverse recovery due to snubber circuit diodes, greatly reducing external

Number of components in the design and system cost. OB2263 provides a complete range of protection

Automatic self-recovery function, including Cycle-byCycle Current Limiting (OCP), overload protection

(OLP), VDD overvoltage clamp and undervoltage lockout (UVLO). The gate drive output is clamped

Up to 18V to protect power MOSFETs. OnBright enables excellent EMI performance

Proprietary frequency shuffling technology and soft switch control on the totem pole

gate drive output. Tonal energy below 20KHZ eliminates audible noise during design and operation.

OB2263 is available in SOT23-6, SOP-8 and DIP-8 packages.

feature

■ Bright proprietary frequency shuffling technology to improve EMI performance.

■Extended burst mode control for improved efficiency and minimal standby power design

■Audio noise-free operation

■External programmable PWM switching frequency

■Internal synchronization slope compensation

■Low VDD startup current and low operating current (1.4mA)

■ Leading edge blanking on current sense input

■Have good protection range and automatic self-recovery function

o VDD overvoltage clamp and undervoltage

Lag Lock (UVLO)

o Gate output maximum voltage clamp (18V)

o Brightness-specific line input compensation

Cycle-by-cycle overcurrent threshold setting

for constant output power limit

Universal input voltage range.

oOverload Protection (OLP)