OB2358AP datasheet(8/9 Pages) ETC2

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OB2358

Current Mode PWM Power Switch

Freq Shuffling

A good tradeoff is achieved through the

built-in totem pole gate design with right output

strength and dead time control. The low idle loss

and good EMI system design is easier to achieve

with this dedicated control scheme.

In addition to the gate drive control scheme

mentioned, the gate drive strength can also be

adjusted externally by a resistor connected between

VDD and VDDG, the falling edge of the Drain

output can be well controlled. It provides great

flexibility for system EMI design.

• Protection Controls

Good power supply system reliability is achieved

with its rich protection features including Cycle-by-

Cycle

current

limiting

(OCP),

Over

Load

Protection (OLP) and over voltage clamp, Under

Voltage Lockout on VDD (UVLO).

With On-Bright Proprietary technology, the OCP is

line voltage compensated to achieve constant

output power limit over the universal input voltage

range.

At overload condition when FB input voltage

exceeds power limit threshold value for more than

TD_PL, control circuit reacts to shut down the

switcher. Switcher restarts when VDD voltage

drops below UVLO limit.

VDD is supplied by transformer auxiliary winding

output. It is clamped when VDD is higher than 30V.

The output of OB2358 is shut down when VDD

drops below UVLO_ON limit and Switcher enters

power on start-up sequence thereafter.

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