EL SEGUNDO, CA. October 2000 - International Rectifier (NYSE: IRF) introduced the first 200V Integrated Switched Mode Power Supply IC. The IR4007K is a DC-DC converter control IC with a fully avalanche-characterized MOSFET built-in.

The avalanche capability simplifies circuit design, since the device can handle momentary transient voltages above its rated breakdown voltage as long as they do not exceed the specified avalanche energy limit of 100mJ.

The IR4007K has unique input and output feedback circuits and two operating modes for efficient power conversion and flexible circuit design.

Application topologies include 48-volt in, 3.3-volt output flyback converters up to 5A. Typical applications include DC-DC conversion for distributed architecture power systems with a 48V main power rail, such as used in telecom power supplies and datacom system servers, or AC-DC switching power supplies with up to 100VDC nominal DC input.

Dual Functions Built-In for Design Flexibility

"The IR4007K is the most rugged, most flexible, most efficient SMPS control IC for cost-optimized, primary-side DC-DC flyback converters. Other competing devices lack the avalanche energy capability the IR4007K includes. The new IR4007K has the control circuit and low RDS(on) to enable more efficient, high-density power conversion and cuts switching losses in half," said David Tam, Vice President for Power Integrated Circuit Products at IR.

Two operating modes are built-in: quasi-resonant mode and pulse ratio control (PRC). In quasi-resonant mode, the transformer primary inductance and an additional capacitor provide a resonant signal to trigger the MOSFET when the drain-source voltage is at a minimum, reducing power dissipation. In quasi-resonant mode, the IR4007K cuts switching losses by as much as 50%, increasing power density, power capability and yet retaining a small circuit footprint. Quasi-resonant mode works best when the power supply load does not have a wide current range.

PRC mode controls the power by adjusting the MOSFET on-time, and keeping the MOSFET off-time fixed. PRC mode would be best when a low-current standby mode may be required.

Additional devices rated at 200, 650 and 800 volts with output power from 15 to 100 watts are on the horizon. MOSFET ratings for the integrated switch have R_DS(on) ratings as low as 0.082mOhms. Package configurations will include TO-220, TO-262 and D2Pak. The new devices are slated for release by the end of November 2000.

Built-in MOSFET Characteristics

	Pin #	Symbol	Description
	1	S	MOSFET Source Terminal
	2	Ground	Ground Terminal
	3	D	MOSFET Drain Terminal
	4	Vcc	Control Circuit Supply Voltage
	5	OCP/FB	Overcurrent detection, and Voltage mode control feedback signal

BVDSS	RDS(on)	Max Switching Current	EAS
200V	0.4W	4.0A	100mJ 1
1 Test Conditions - Vdd=50V, L=10mH, G=12V, Ipk=4.0A

Pricing and Additional Information

Pricing for IR's new IR4007K begins at US $2.00 each in 10,000-unit quantities.