TOP250F-TL datasheet(27/52 Pages) POWERINT

27 / 52 page

TOP242-250

12/04

Function

TOPSwitch-II TOPSwitch-GX

Figures

TOPSwitch-GX

Advantages

Switching Frequency

Option (Y, R and F

Packages)

N/A*

66 kHz ±7%

14,15

• 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)

Frequency Jitter

N/A*

±4 kHz @ 132 kHz

±2 kHz @ 66 kHz

9,46

• Reduces conducted EMI

Frequency Reduction N/A*

At a duty cycle below

10%

• Zero load regulation without

dummy load

• Low power consumption at

no-load

Remote ON/OFF

N/A*

Single transistor or

optocoupler interface

or manual switch

11,22,23,

24,25,26,

27,29,36,

37,38,39,

• Fast ON/OFF (cycle-by-cycle)

• Active-on or active-off control

• Low consumption in remote off

state

• Active-on control for fail-safe

• Eliminates expensive in-line

on/off switch

• Allows processor controlled turn

on/off

• Permits shutdown/wake-up of

peripherals via LAN or parallel

port

Synchronization

N/A*

Single transistor or

optocoupler interface

• Synchronization to external lower

frequency signal

• Starts new switching cycle on

demand

Thermal Shutdown

125 °C min.

Latched

Hysteretic 130 °C

min. shutdown (with

75 °C hysteresis)

• Automatic recovery from thermal

fault

• Large hysteresis prevents circuit

board overheating

Current Limit

Tolerance

±10% (@ 25 °C)

-8% (0 °C to

100 °C)

±7% (@ 25 °C)

-4% Typical

(0 °C to 100 °C)**

• 10% Higher power capability due

to tighter tolerance

DRAIN

Creepage

at Package

DIP

0.037” / 0.94 mm

0.137” / 3.48 mm

• Greater immunity to arcing as a

result of build-up of dust, debris

and other contaminants

SMD

0.037” / 0.94 mm

0.137” / 3.48 mm

TO-220 0.046” / 1.17 mm

0.068” / 1.73 mm

DRAIN Creepage at

PCB for Y, R and F

Packages

0.045” / 1.14 mm

(R and F Package

N/A*)

0.113” / 2.87 mm

(performed leads)

• Performed leads accommodate

large creepage for PCB layout

• Easier to meet Safety (UL/VDE)

Table 4 (cont). Comparison Between TOPSwitch-II and TOPSwitch-GX.

*Not available **Current limit set to internal maximum

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