Wondering how to get the ready circuit diagram built out
of latest semiconductor devices, which can be used to produce
ATX switching power supply for a PC. ON Semiconductor has
addressed this need by announcing reference design for this
purpose.
ON Semiconductor has released a new switch mode power supply
(SMPS) reference design for ATX power supplies used to power
desktop computers. This 255 watt version exceeds 80 PLUS
Silver, ENERGY STAR 5.0, and Climate Savers Computing Initiative
Step 3 efficiency standards for desktop PC power supply.
The new reference design offers better power efficiency
under real world operating conditions, and can be deployed
immediately for production.
Some of the features of the reference design are:
1. Achieving a maximum efficiency of 90 percent at 50 percent
load with input voltage of 230 to 240 Vac, and
achieves greater than 88 percent efficiency at 50 percent
load with input voltage of 100 to 115 Vac.
2. The ATX reference design meets IEC 61000-3-2 power factor
requirements for power factor greater than
0.95 at 100, 115, 230, and 240 Vac.
3. The reference design addresses all functional blocks
of the ATX power supply, including power factor
correction, switch-mode power supply control and regulation,
post regulation, and standby power.
4. The design utilizes several of ON Semiconductor's newest
power management devices and draws from
its leading discrete component portfolio to achieve superior
efficiency performance.
Key products in the reference design include:
1. NCP1654 Continuous Conduction Mode (CCM) Power Factor
Controller: This device enables the inclusion
of a PFC front-end into an ATX power supply. The NCP1654
is priced at $0.66 in 2,500-unit quantities,
in SOIC-8 packages.
2. NCP1396 Resonant Mode Controller with High and Low Side
Drivers: Integrated resonant tank solution,
i.e., the leakage inductance of transformer acts as resonant
inductance. The NCP1396 is priced
at $0.85 in 2,500-unit quantities, in SOIC-8 packages.
3. NCP1027 65 kHz PWM Controller featuring 700 V MOSFET:
Adjustable ramp compensation feature allows
deep CCM operation. Skip mode operation optimizes light
load efficiency. The NCP1027 is priced
at $0.97 per unit in 1,000-unit quantities, in PDIP-7 packages.
4. NCP4302 Synchronous Rectification Controller: Integrated
Secondary Side Controller simplifies the implementation
of synchronous rectification in switchmode power supplies.
In addition to the SR control, the
device incorporates an accurate shunt regulator with TL431
functionality, reducing board space
and system cost. The NCP4302 is priced at $0.74 per unit
in 2,500-unit quantities, in SOIC-8 packages.
5. NCP1587 Synchronous Buck Controller: Built in non-overlap
timing control prevents cross conduction
of rectification MOSFETs. The NCP1587 is priced at $0.33
per unit in 2,500-unit quantities,
in SOIC-8 packages.
6. MBR20L45 L-Series, 20 A, 45 V, Dual Schottky Rectifier:
Low forward voltage drop minimizes power loss.
The MBR20L45 is priced at $0.60 per unit in 50-unit quantities,
in TO-220 packages.
7. NTD4809N Single N-Channel, 30 V, 58 A, Power MOSFET:
The NTD4809N is priced at $0.19 per unit in
2,500-unit quantities, in DPAK and IPAK packages.
Demonstrations: ON Semiconductor will demonstrate the reference
design at APEC in Washington, D.C., February 16-18, and
IIC in Shenzhen, China, February 26-27.
For more information, visit http://www.onsemi.com
