General Description
ASM8P18xx is a high performance, adjustable frequency, PWM controller with an integrated spread spectrum modulator for EMI reduction. It contains all the functions of a standard PWM controller along with a user configurable spread spectrum modulation with adjustable spread. ASM8P18xx allows significant system cost savings by reducing the number of PCB layers and shielding that are traditionally required to pass EMI regulation.
ASM8P18xx is the industry’s first general purpose EMI reduction IC, specifically designed for use in SMPS systems. ASM8P18xx is compatible to any other 3842 PWM controllers.
ASM8P18xx is capable of driving 1A maximum current output and it covers a wide supply voltage range from 7V DC to 30V DC. The PWM frequency is selectable from 40 KHz to 400 KHz.
ASM8P18xx provides under voltage lockout, thermal shutdown, overload, and undercurrent protection. It is available in 8-pin MicroSO, P-DIP and SOIC package.

Features
*30V maximum operating voltage with CMOS technology
*Adjustable PWM frequencies (40 KHz to 400 KHz)
*Maximum Output drive current of 1A.
*Wide duty cycle range (0% minimum to 95% maximum)
*Spread spectrum modulation with adjustable spread.
*Under voltage lockout with hysteresis.
*Low startup current: 275?A maximum
*Pin compatible with industry standard 3842 PWM controller.
*Temperature range –40°C to +85°C.
*Thermal shutdown, overload and undercurrent protection.
*Frequency skip mode.
*Available in 8-pin plastic MicroSO, P-DIP and SOIC packages.

Applications
*Off-line converter
*DC-DC converter
*Monitor power supply
*Computer/DVD/STB power supply
*Wireless base station power supply
*Telecom power supply

ASM8P18S42ER, ASM8P1843, ASM8P18S43ER, ASM8P18S44ER, ASM8P18S45ER

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Product Description
The P278xA is a versatile spread spectrum frequency modulator designed specifically for digital camera and other digital video and imaging applications. The P278xA reduces electromagnetic interference (EMI) at the clock source, which provides system wide reduction of EMI of all clock dependent signals. The P278xA allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations.
The P278xA uses the most efficient and optimized modulation profile approved by the FCC. The P278xA modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock and, more importantly, decreases the peak amplitudes of its harmonics. This results in significantly lower system EMI compared to the typical narrow band signal produced by oscillators and most frequency generators. Lowering EMI by increasing a signal’s bandwidth is called spread spectrum clock generation.

Features
*Provides up to 15dB of EMI suppression
*FCC approved method of EMI attenuation
*Generates a 1X, 2X, and 4X low EMI spread spectrum clock of the input frequency
*Input frequency range from 3 to 78MHz
*External loop filter for spread % adjustment
*Spreading ranges from ±0.25% to ±5.0%
*Ultra low cycle-to-cycle jitter
*Zero-cycle slip
*3.3V operating voltage range
*10 mA output drives
*TTL or CMOS compatible outputs
*Ultra-low power CMOS design
*P278XA is available in 8 pin SOIC and TSSOP Packages
*Available for industrial and automotive temperature ranges.

Applications
The P278xA is targeted towards MFP, xDSL, fax modem, set-top box, USB controller, DSC, and embedded systems.

P278XA-08ST, P278XA-08SR, P278XA-08TT, P278XA-08TR
TAG EMI, ic, Reduction

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DESCRIPTION
The PS9851-1, -2 are optically coupled isolators containing GaAlAs LED on the input side and a CMOS output IC on the output side.
They are high common mode transient immunity (CMR), high-speed CMOS output type photocouplers designed for high-speed logic interface circuits.

FEATURES
• High-speed response (15 Mbps)
• Operable at high temperature (−40 to +100°C)
• High common mode transient immunity (CMH, CML = ±20 kV/μs TYP.)
• High isolation voltage (BV = 2 500 Vr.m.s.)
• Pulse width distortion (⏐tPHL−tPLH⏐ = 3 ns TYP.)
• Ordering number of tape product : PS9851-1-F3, F4: 1 500 pcs/reel
: PS9851-2-F3, F4: 1 500 pcs/reel
• Pb-Free product
• Safety standards
• UL approved: File No. E72422
• DIN EN60747-5-2 (VDE0884 Part2) approved No.40008347 (Option)

APPLICATIONS
• FA Network
• Measurement equipment
• PDP

PS9851-1-F3
PS9851-1-F4

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