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AS99127F, AS998A, AS998AD

Table of contents:
Info of AS99127F
Info of AS998A
Info of AS998AD

AS99127F, AS998A, AS998AD Selling Leads, Datasheet

MFG:ASUS Package Cooled:QFP D/C:05+

AS99127F, AS998A, AS998AD Datasheet download

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Part Number: AS99127F

MFG: ASUS

Package Cooled: QFP

D/C: 05+

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AS998A General Description

The AS998/AS998A is an IC intended for use as a PWM controller for switch mode power supplies. The device is particularly suited as a primary side controller for adapter, printer, peripheral, mobile chargers and desktop auxiliary power supplies. The AS998/AS998A is manufactured in BICMOS technology and exhibits very low start-up and operating power. This allows the device to be suitable in applications where stringent standby or Blue Angel criteria are required.

Many of the external functions associated with PWM controllers have been integrated into the AS998/AS998A allowing the external component count to be significantly reduced. Features such as fixed internal oscillator, internal ramp compensation and current filters all reduce the external support components.

The AS998/AS998A has a typical output rise and fall time of 250/210 ns.

AS998A Maximum Ratings

Rating	Symbol	Rating	Unit
Supply Voltage (Low Impedance Source)	V_DD	13	V
Supply Voltage (High Impedance Source)	I_DD	45	mA
Output Peak Current	I_OUT	600	mA
Regulator Current	I_REG	10	mA
Continuous Power at 25 8L SOIC 8L PDIP	P_D	750 1000	mW mW
Junction Temperature	T_J	150
Storage Temperature	T_STG	-65 to 150
Lead Temperature, Soldering 10 Seconds	T_L	300

Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

AS998A Features

• Low start-up current 64 A (Typ)
• Low running current 2 mA (Typ)
• Low power light load mode
• Low power standby when OV is activated
• Extended commercial operating temperature range: 0 to 105°C
• On-board fixed frequency oscillator 100 kHz (Typ)
• Frequency randomizer to reduce EMC emissions
• Dedicated OV shutdown pin
• On-board voltage ramp compensation
• On-board current sensing filtering
• Optional primary side regulation

AS998A Connection Diagram

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