PWM Controllers offer PFC shut-down feature.
Press Release Summary:
Current Mode Controllers Series NCP1230 and NCP1231 allow power supply designers to shut-down power factor correction stage in light or no-load conditions. Units offer cycle skipping at light loads, internal ramp compensation, and frequency dithering. Both series are available in 65, 100, and 133 kHz frequency options. Series NCP1230 integrates 2.5 ms soft-start, while Series NCP1231 offers adjustable soft start and brown out function.
Original Press Release:
ON Semiconductor Introduces PWM Controllers That Enable Low Standby Power in SMPS for Notebook Adapters, Off-Line Battery Chargers and Consumer Electronics
New NCP1230 and NCP1231 families of devices feature industry's only Power Factor Correction stage turn-off in light or no-load conditions
Phoenix, Arizona - Jan. 27, 2005 - Addressing the growing industry need for Switched Mode Power Supplies (SMPS) manufacturers to reduce the standby power consumption at input levels higher than 75 watts (W) (medium-to-high-power), ON Semiconductor (Nasdaq: ONNN) today introduced the NCP1230 and NCP1231 families of PWM controllers. These current mode controllers are ideal for power supply applications in notebook adapters, off-line battery chargers and consumer electronics equipments.
The NCP1230 / NCP1231 devices allow the power supply designer to shut-down the Power Factor Correction (PFC) stage in light or no-load conditions. PFC is needed in power supply designs from 50 watt (W) to 75 W, but it typically becomes a liability by continuing to consume power at light loading. This inherently lowers the overall conversion efficiency of the power supply. The NCP1230 and NCP1231 families of PWM controllers are the only devices on the market offering the PFC shut-down feature.
"ON Semiconductor's NCP1230 and NCP1231 devices provide power supply designers with a unique tool to meet global power stand-by regulations." said Andy Williams, ON Semiconductor director of Power Conversion Products. "These current mode controllers are compatible with any power factor correction IC and address the challenges of improving efficiency and lowering EMI in both the active and stand-by power modes."
The Devices
The NCP1230 and NCP1231 families are a series of current mode controllers offering cycle skipping at light loads, internal ramp compensation, and frequency dithering for improved electromagnetic interference (EMI) performance. Both families feature the power factor shutdown feature and are available in three frequency options - 65 kilohertz (kHz), 100 kHz, and 133 kHz. A short-circuit protection independent of the auxiliary winding insures a safe and robust design. The NCP1230 integrates a 2.5 milliseconds (ms) soft-start, an internal high-voltage start-up current source for lossless start-up, while in the NCP1231 the soft start is adjustable and a brown out function has been added
The NCP1230A device also includes a proprietary soft-skipping mode at light loading which prevents acoustic noise generation.
Packaging and Price
The NCP1230 and NCP1231 families are offered in both SO-8 and PDIP-8 packages (minus pin # 7) and are priced at between $0.48 and $0.53 per unit in 10,000-unit quantities.
About ON Semiconductor
With its global logistics network and strong portfolio of power semiconductor devices, ON Semiconductor (Nasdaq: ONNN) is a preferred supplier of power solutions to engineers, purchasing professionals, distributors and contract manufacturers in the computer, cell phone, portable devices, automotive and industrial markets. For more information, please visit ON Semiconductor's website at www.onsemi.com.
