TOP259YN
Non-returnable
TOPSwitch-HX cost effectively incorporates a 700 V power
MOSFET,
high voltage switched current source, PWM control,
oscillator, thermal shutdown circuit, fault protection and other
control circuitry onto a monolithic device.
In order to improve noise-immunity on large TOPSwitch-HX
Y package parts, the F pin has been removed (TOP259-261YN
are fi xed at 66 kHz switching frequency) and replaced with a
SIGNAL GROUND (G) pin. This pin acts as a low noise path for
the C pin capacitor and the X pin resistor. It is only required for
the TOP259-261YN package parts.
Notes for Table 1:
1. Minimum continuous power in a typical non-ventilated
enclosed adapter measured at +50 °C ambient. Use of an
external heat sink will increase power capability.
2. Minimum continuous power in an open frame design at
+50 °C ambient.
3. Peak power capability in any design at +50 °C ambient.
4. 230 VAC or 110/115 VAC with doubler.
5. Packages: P: DIP-8C, G: SMD-8C, M: SDIP-10C,
Y: TO-220-7C, E: eSIP-7C, L: eSIP-7F.
See part ordering information.
6. TOP261 and TOP262 have the same current limit set point. In
some applications TOP262 may run cooler than TOP261 due
to a lower R
DS(ON)
for the larger device.
7. TOP256E package parts are available with Green (Halogen
Free) mold compound. See Part Ordering Information on
page 47. Parametrically green material encapsulated E
package parts are identical to non-green parts.
Rev. F 01/09
₹90.00
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Product Details
Lower System Cost, Higher Design Flexibility
Multi-mode operation maximizes effi ciency at all loads
New eSIP-7F and eSIP-7C packages
Low thermal impedance junction-to-case (2 °C per watt)
Low height is ideal for adapters where space is limited
Simple mounting using a clip to aid low cost manufacturing
Horizontal eSIP-7F package ideal for ultra low height adapter
and monitor applications
Extended package creepage distance from DRAIN pin to
adjacent pin and to heat sink
No heatsink required up to 35 W using P, G and M packages
with universal input voltage and up to 48 W at 230 VAC
Output overvoltage protection (OVP) is user programmable for
latching/non-latching shutdown with fast AC reset
Allows both primary and secondary sensing
Line undervoltage (UV) detection prevents turn-off glitches
Line overvoltage (OV) shutdown extends line surge limit
Accurate programmable current limit
Optimized line feed-forward for line ripple rejection
132 kHz frequency (254Y-258Y and all E/L packages) reduces
transformer and power supply size
Half frequency option for video applications