Power integrations TOPSwitch-HX Series User Manual

Rev. J 08/16
25
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
I
2
f Trimming Not available -10% / +20%
• Increased output power for given core size
• Reduced over-load power
Auto-restart Duty Cycle 5.6% 2%
• 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 50 mA (2 MW sense
impedance)
25 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.

Power integrations TOPSwitch-HX Series Specifications

General

Brand	Power integrations
Model	TOPSwitch-HX Series
Category	Switch
Language	English