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AS22, AS2200, AS2208

Table of contents:
Info of AS22
Info of AS2200
Info of AS2208

AS22, AS2200, AS2208 Selling Leads, Datasheet

MFG:Alpha Industries Package Cooled:SMD D/C:2002

AS22, AS2200, AS2208 Datasheet download

Five Points

Part Number: AS22

MFG: Alpha Industries

Package Cooled: SMD

D/C: 2002

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AS2208 General Description

The AS2208 is a simplified pulse width modulation control-ler, offering similar functionality as that of the AS3842.Based on the AS2214, the AS2208 provides the additional features of low startup current and overvoltage latching,making it a good solution for adapter applications.

The PWM function is controlled by the current sense com-parator for normal current mode control. The COMP pin,which serves as an input to the current sense comparator,provides a 1 mA current source which can be tied directly to the control loop optocoupler. The output stage is a high current totem pole output that sees only 85 ns delay from the PWM comparator.

The AS2208 requires only 100 A of startup current. The undervoltage lockout (UVLO)thresholds are nominally 14V for turn on and 8 V for turn off. The VREG pin, based on a trimmed bandgap reference, provides a temperature com-pensated 5 V to loads of up to 50 mA. The oscillator discharge current is trimmed to provide guaranteed duty cycle clamping.

AS2208 Maximum Ratings

Parameter	Symbol	Rating	Unit
Supply Voltage (I_CC< 30 mA)	V_CC	Self-Limiting	V
Supply Voltage (Low Impedance Source)	V_CC	20	V
Reference Current	I_REF	200	mA
Output Current	I_OUT	1	A
Output Voltage	V_OUT	20	V
Continuous Power Dissipation at 25° C	P_D	500	mW
Junction Temperature	T_J	150	°C
Storage Temperature Range	T_STG	65 to 150	°C
Lead Temperature, Soldering 10 Seconds	T_L	300	°C

AS2208 Features

Low Startup Current
Single-start or auto-restart modes
Oscillator trimmed for precision duty cycle clamp
Standard temperature range extended to 105°C
Remote on / off control
Self limiting supply Voltage
Standard current mode control

AS2208 Connection Diagram

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