TOP243 View Datasheet(PDF) - Power Integrations, Inc

Part Name

Description

Manufacturer

TOP243

Extended power, design elexible, integrated off-line switcher

Power Integrations, Inc 

TOP242-250

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.

Function

TOPSwitch-II TOPSwitch-GX Figures TOPSwitch-GX Advantages

Soft-Start

N/A*

External Current Limit N/A*

DCMAX

67%

Line Feed Forward with N/A*

DCMAX Reduction

Line OV Shutdown

N/A*

Line UV Detection

N/A*

Switching Frequency

Switching Frequency

Option (Y, R and F

Packages)

100 kHz ±10%

N/A*

Frequency Jitter

N/A*

Frequency Reduction N/A*

10 ms

Programmable

100% to 30% of

default current

limit

11,20,21,

24,25,27,

28,34,35,

38,39

78%

7

78% to 38%

Single resistor

programmable

Single resistor

programmable

132 kHz ±6%

66 kHz ±7%

7,11,17,

26,27,28,

31,40

11,17,19,

26,27,28,

31,33,40

11,17,18,

26,27,28,

31,32,40

13,15

14,15

±4 kHz@132 kHz 9,46

±2 kHz@66 kHz

At a Duty Cycle 7

below 10%

• Limits peak current and voltage

component stresses during start-up

• Eliminates external components

used for soft-start in most

applications

• Reduces or eliminates output

overshoot

• Smaller transformer

• Higher efficiency

• Allows power limiting (constant over-

load power independent of line

voltage

• Allows use of larger device for lower

losses, higher efficiency and smaller

heatsink

• 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

• Rejects line ripple

• Increases voltage withstand cap-

ability against line surge

• Prevents auto-restart glitches

during power down

• Smaller transformer

• Below start of conducted EMI limits

• Lower losses when using RC and

RCD snubber for noise reduction in

video applications

• Allows for higher efficiency in

standby mode

• Lower EMI (second harmonic below

150 kHz)

• Reduces conducted EMI

• Zero load regulation without dummy

load

• Low power consumption at no load

Table 4. Comparison Between TOPSwitch-II and TOPSwitch-GX. (continued on next page) *Not available

27 H

9/02

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