TOP243FN datasheet(26/52 Pages) POWERINT

26 / 52 page

TOP242-250

12/04

Function

TOPSwitch-II TOPSwitch-GX

Figures

TOPSwitch-GX

Advantages

Soft-Start

N/A*

10 ms

• Limits peak current and voltage

component stresses during start-

• Eliminates external components

used for soft-start in most

applications

• Reduces or eliminates output

overshoot

External Current

Limit

N/A*

Programmable 100%

to 30% of default

current limit

11,20,21,

24,25,27,

28,34,35,

38,39

• Smaller transformer

• Higher efﬁciency

• Allows power limiting (constant

overload power independent of

line voltage)

• Allows use of larger device for

lower losses, higher efﬁciency

and smaller heatsink

MAX

67%

78%

• Smaller input cap (wider dynamic

range)

• Higher power capability (when

used with RCD clamp for large

OR)

• Allows use of Schottky secondary

rectiﬁer diode for up to 15 V

output for high efﬁciency

Line Feed-Forward

with DC

MAX Reduction

N/A*

78% to 38%

7,11,17,

26,27,28,

31,40

• Rejects line ripple

Line OV Shutdown

N/A*

Single resistor

programmable

11,17,19,

26,27,28

31,33,40

• Increases voltage withstand

capability against line surge

Line UV Detection

N/A*

Single resistor

programmable

11,17,18,

26,27,28,

31,32,40

• Prevents auto-restart glitches

during power down

Switching Frequency 100 kHz ±10%

132 kHz ±6%

13,15

• Smaller transformer

• Below start of conducted EMI

limits

Table 4. Comparison Between TOPSwitch-II and TOPSwitch-GX (continued on next page).

*Not available

Key Application Considerations

TOPSwitch-II

vs. TOPSwitch-GX

Table 4 compares the features and performance differences

between TOPSwitch-GX and TOPSwitch-II. Many of the new

features eliminate the need for additional discrete components.

Other features increase the robustness of design, allowing cost

savings in the transformer and other power components.

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