TOP258LG Power Integrations, TOP258LG Datasheet - Page 25

• Manufacturer Part Number: TOP258LG
• Description: IC OFFLINE SWIT PROG OVP 7FESIP
• Manufacturer: Power Integrations
• Series: TOPSwitch®-HXr
• Type: Off Line Switcherr

Specifications of TOP258LG

• Output Isolation: Isolated
• Frequency Range: 119 ~ 145kHz
• Voltage - Output: 700V
• Power (watts): 122W
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 7-SIP, 6 Leads, Exposed Pad, Formed Leads
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
TOPSwitch-HX vs. TOPSwitch-GX
Table 4.
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Function
EcoSmart
Output Overvoltage
Protection (OVP)
Line Feed-Forward with Duty
Cycle Reduction
Switching Frequency DIP-8
Package
Lowest MOSFET On
Resistance in DIP-8 Package
I
Auto-restart Duty Cycle
Frequency Jitter
Thermal Shutdown
External Current Limit
Line UV Detection Threshold
Soft-Start
2
f Trimming
Comparison Between TOPSwitch-GX and TOPSwitch-HX.
TOPSwitch-GX
Linear frequency reduction to
30 kHz (@ 132 kHz) for
duty cycles < 10%
Not available
Linear reduction
132 kHz
3.0 Ω (TOP246P)
Not available
5.6%
±4 kHz @ 132 kHz
±2 kHz @ 66 kHz
130 °C to 150 °C
30%-100% of I
50 μA (2 MΩ sense
impedance)
10 ms duty cycle and current
limit ramp
LIMIT
TOPSwitch-HX
Multi-mode operation with
linear frequency reduction to
30 kHz (@ 132 kHz) and
multi-cycle modulation
(virtually no audible noise)
User programmable primary
or secondary hysteretic or
latching OVP
Dual slope reduction with
lower, more accurate onset
point
66 kHz
1.8 Ω (TOP258P)
-10% / +20%
2%
±5 kHz @ 132 kHz
±2.5 kHz @ 66 kHz
135 °C to 150 °C
30%-100% of I
trim at 0.7 × I
25 μA (4 MΩ sense
impedance)
17 ms sweep through multi-
mode characteristic
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.
LIMIT
LIMIT
, additional
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TOPSwitch-HX Advantages
Improved effi ciency over load (e.g. at 25% load
point)
Improved standby effi ciency
Improved no-load consumption
Protects power supply output during open loop fault
Maximum design fl exibility
Improved line ripple rejection
Smaller DC bus capacitor
Increased output power for given MOSFET size due
to higher effi ciency
Increased output power in designs without external
heatsink
Increased output power for given core size
Reduced over-load power
Reduced delivered average output power during
open loop faults
Reduced EMI fi lter cost
Increased design margin
Reduced tolerances when current limit is set
externally
Reduced dissipation for lower no-load consumption
Reduced peak current and voltage component
stress at startup
Smooth output voltage rise
TOP252-262
Rev. F 01/09
25