TOP232P datasheet(19/36 Pages) POWERINT

19 / 36 page

Rev. C 06/15

TOP232-234

www.power.com

Key Application Considerations

TOPSwitch-FX vs. TOPSwitch-ll

Table 3 compares the features and performance differences

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

features eliminate the need for costly discrete component.

Other features increase the robustness of design allowing

cost savings in the transformer and other power components.

*Not available

Table 3. Comparison Between TOPSwitch-II and TOPSwitch-FX. (continued on next page)

Function

TOPSwitch-II

TOPSwitch-FX

Figures Advantages

Soft-Start

N/A*

10 ms

• Limits peak current and voltage

component stresses during start-up

• Eliminates external components

used for soft-start in most applications

• Minimizes output overshoot

External Current Limit

N/A*

Programmable

8, 17,

• Smaller transformer

100% to 40% of

18, 21,

• Higher efficiency

default current

• Allows tighter power limit

limit

during output overload conditions

MAX

67%

78%

• Smaller input cap (wider dynamic range)

• Higher power capability (when used

with RCD clamp for large V

OR)

• Allows use of Schottky secondary

rectifier diode for up to 15 V output

for high efficiency

Line Feed-forward with

N/A*

78% to 38%

4, 8, 14,

• Rejects line ripple

MAX Reduction

• Increases transient and surge voltage

withstand capability

Line OV Shutdown

N/A*

Single resistor

8, 14,

• Increases voltage withstand capability

programmable

16, 23

against line surge

Line UV Detection

N/A*

Single resistor

5, 8, 14,

• Prevents auto-restart glitches during

programmable

15, 23

power-down

Switching Frequency

100 kHz ±10%

132 kHz ±7%

• Smaller transformer

• Fundamental below 150 kHz for

conducted EMI

Switching Frequency

N/A*

66 kHz ±7%

11, 12

• Lower losses when using RC and RCD

Option (TO-220 only)

snubber for noise reduction in video

applications

• Allows for higher efficiency in standby

mode

• Lower EMI (second harmonic below

150 kHz)

Frequency Jitter

N/A*

±4 kHz@132 kHz

6, 28

• Reduces conducted EMI

±2 kHz@66 kHz

Cycle Skipping

N/A*

At DC

MIN (1.5%)

• Zero load regulation without dummy

load

• Low power consumption at no load

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