OB2535/OB2532/OB2538

OB2535 is a high performance offline PWM Power
switch for low power AC/DC charger and adaptor
applications. It operates in primary-side sensing and
regulation. Consequently, opto-coupler and TL431
could be eliminated. Proprietary Constant Voltage
(CV) and Constant Current (CC) control is integrated
as shown in the figure below.
In CC control, the current and output power setting
can be adjusted externally by the sense resistor Rs at
CS pin. In CV control, multi-mode operations are
utilized to achieve high performance and high
efficiency. In addition, good load regulation is
achieved by the built-in cable drop compensation.
Device operates in PFM in CC mode as well at large
load condition and it operates in PWM with
frequency reduction at light/medium load.
OB2535 offers power on soft start control and
protection coverage with auto-recovery features
including Cycle-by-Cycle current limiting, VDD
OVP, VDD clamp and UVLO. Excellent EMI
performance is achieved with On-Bright proprietary
frequency shuffling technique.
High precision constant voltage (CV) and constant
current (CC) can be achieved by OB2535.