IP1843A

• Guaranteed ±1% reference voltage tolerance
• Accurate oscillator discharge current
• Guaranteed ±10% frequency tolerance
• Low startup current (<500 A)
• Under voltage lockout with hysteresis
• Output state completely defined for all supply and input conditions
• Interchangeable with IP and UC1842/3 series for improved operation
• 500kHz Oscillator operation

The IP1842A/IP1843A series of switching regulator control circuits contain all the functions necessary to implement off-line, current mode switching regulators, using a minimum number of external parts. Functions included are voltage reference, error amplifier, current sense comparator, oscillator, totem-pole output driver and under-voltage lockout circuitry.

Although pin compatible with the standard IP1842/3 parts these devices offer improved performance in several areas. They also offer tighter specification and improved performance over the IP and IP1843A series, whilst retaining complete compatibility.