TOP242PN

POWER INTEGRATIONS  TOP242PN  芯片, 离线开关

The is a TOPSwitch-GX Integrated Off-line Switcher IC flyback supply provides 4 outputs, delivering 7W from a 230VAC ±15% input. Resistor R7 programs the internal TOP242PN current limit to 78% of nominal, just above the level needed for full load at low line. This feature allows a more continuous transformer design for better efficiency and cross-regulation, without requiring a larger core size. Resistor R12, C10 and L2 filter conducted EMI; R12 is a flameproof fusible type, also functioning as a fuse. For lower cost, if the supply does not have to meet conducted EMI with the output connected to earth ground, the common mode choke can be replaced with a π filter. A Zener clamp D11 and VR1 was selected over an RCD clamp to minimize zero load consumption.

.

<0.5W Input power at zero load

.

Low component count design occupies 80 x 30 x 16mm

.

Integrated soft-start reduces start-up component stresses

.

Extended power range for higher power applications

.

Eliminate or reduce cost of external components

.

Externally programmable accurate current limit

.

No turn off glitches line under-voltage UV detection

.

Line over voltage OV shutdown extends line surge limit

.

132kHz Frequency reduces transformer/power supply size

.

Hysteretic thermal shutdown for automatic fault recovery

.

Large thermal hysteresis prevents PC board overheating