OB2263AP(DIP8), OB2263CP(SOP8) OB2263MP (SOT23-6)
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Detailed Product Description
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On-Bright Current Mode PWM Controller IC for offline flyback converter applications in sub 30W power range OB2263AP(DIP8), OB2263CP(SOP8) OB2263MP (SOT23-6)
Applications: Offline AC/DC flyback converter for Battery ChargerPower Adaptor Set-Top Box Power Supplies Open-frame SMPS
Description: 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
sub-harmonic 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.
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