OB2263 pdf datasheet

OB2263 is a highly integrated current mode PWM

control IC opTImized for high performance, low

standby power and cost effecTIve offline flyback

converter applicaTIons in sub 30W range.

PWM switching frequency at normal operaTIon is

externally programmable and 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.

VDD low startup current and low operating current

contribute to a reliable power on startup design with

OB2263. A large value resistor could thus be used in

the startup circuit to minimize the standby power.

The internal slope compensation improves system

large signal stability and reduces the possible subharmonic

oscillation at high PWM duty cycle output.

Leading-edge blanking on current sense(CS) input

removes the signal glitch due to snubber circuit diode

reverse recovery and thus greatly reduces the external

component count and system cost in the design.

OB2263 offers complete protection coverage with

automatic self-recovery feature including Cycle-by-

Cycle current limiting (OCP), over load protection

(OLP), VDD over voltage clamp and under voltage

lockout (UVLO). The Gate-drive output is clamped

to maximum 18V to protect the power MOSFET.

Excellent EMI performance is achieved with On-

Bright proprietary frequency shuffling technique

together with soft switching control at the totem pole

gate drive output.