UC2854B-EP

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SGLS318A – NOVEMBER 2005 – REVISED NOVEMBER 2015

5 Description (continued)

The UC2854A/B products improve upon the UC2854 by offering a wide bandwidth, low offset current amplifier, a

faster responding and improved accuracy enable comparator, a VREF GOOD comparator, UVLO threshold

options (16 V/10 V for offline, 10.5 V/10 V for startup from an auxiliary 12-V regulator), lower startup supply

current, and an enhanced multiply/divide circuit.

New features like the amplifier output clamps, improved amplifier current sinking capability, and low offset VAC

pin reduce the external component count while improving performance. Improved common mode input range of

the multiplier output/current amplifier input allow the designer greater flexibility in choosing a method for current

sensing. Unlike its predecessor, RSET controls only oscillator charging current and has no effect on clamping the

maximum multiplier output current. This current is now clamped to a maximum of 2 × IAC at all times which

simplifies the design process and provides foldback power limiting during brownout and extreme low line

conditions.

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