TOP254EN datasheet(25/50 Pages) POWERINT

25 / 50 page

Rev. M 12/21

TOP252-262

www.power.com

Key Application Considerations

TOPSwitch-HX vs. TOPSwitch-GX

Table 4 compares the features and performance differences

between TOPSwitch-HX and TOPSwitch-GX. 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.

TOPSwitch-HX vs. TOPSwitch-GX

Function

TOPSwitch-GX

TOPSwitch-HX

TOPSwitch-HX Advantages

EcoSmart

Linear frequency reduction to

30 kHz (@ 132 kHz) for

duty cycles < 10%

Multi-mode operation with

linear frequency reduction to

30 kHz (@ 132 kHz) and

multi-cycle modulation

(virtually no audible noise)

•

Improved efficiency over load (e.g. at 25% load

point)

•

Improved standby efficiency

•

Improved no-load consumption

Output Overvoltage

Protection (OVP)

Not available

User programmable primary

or secondary hysteretic or

latching OVP

•

Protects power supply output during open loop fault

•

Maximum design flexibility

Line Feed-Forward with Duty

Cycle Reduction

Linear reduction

Dual slope reduction with

lower, more accurate onset

point

•

Improved line ripple rejection

•

Smaller DC bus capacitor

Switching Frequency DIP-8

Package

132 kHz

66 kHz

•

Increased output power for given MOSFET size due

to higher efficiency

Lowest MOSFET On

Resistance in DIP-8 Package

3.0

W (TOP246P)

1.8

W (TOP258P)

•

Increased output power in designs without external

heat sink

I2f Trimming

Not available

-10% / +20%

•

Increased output power for given core size

•

Reduced over-load power

Auto-restart Duty Cycle

5.6%

•

Reduced delivered average output power during

open loop faults

Frequency Jitter

±4 kHz @ 132 kHz

±2 kHz @ 66 kHz

±5 kHz @ 132 kHz

±2.5 kHz @ 66 kHz

•

Reduced EMI filter cost

Thermal Shutdown

130 °C to 150 °C

135 °C to 150 °C

•

Increased design margin

External Current Limit

30%-100% of I

LIMIT

30%-100% of I

LIMIT, additional

trim at 0.7 × I

LIMIT

•

Reduced tolerances when current limit is set

externally

Line UV Detection Threshold

mA (2 MW sense

impedance)

mA (4 MW sense

impedance)

•

Reduced dissipation for lower no-load consumption

Soft-Start

10 ms duty cycle and current

limit ramp

17 ms sweep through

multi-mode characteristic

•

Reduced peak current and voltage component

stress at startup

•

Smooth output voltage rise

Table 4.

Comparison Between TOPSwitch-GX and TOPSwitch-HX.

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