Datasheet > AS2208

AS2208

更新时间： 2024-11-06 22:05:51

品牌	Logo	应用领域
其他 - ETC		控制器
页数	文件大小	规格书
6页	36K
描述
Primary Side PWM Controller

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AS2208 数据手册

AS2208

Primary Side PWM Controller

Preliminary Specification

Fea tures

Descrip tion

Low Startup Current

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.

•

Single-start or auto-restart

modes

Oscillator trimmed for precision

duty cycle clamp

•

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.

Standard temperature range

extended to 105°C

•

Remote on / off control

•

Self limiting supply Voltage

Standard current mode control

The AS2208 requires only 100 µA 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.

Pin Config ura tion

—

Top view

8L SOIC (D)

PDIP (N)

VREG

COMP

VREG

COMP

ISNS

RT/CT

VCC

OUT

GND

ISNS

RT/CT

VCC

OUT

GND

Ord ering Inform a tion

Package

Temperature Range

0 to 105° C

Order Code

8-Pin Plastic DIP

8-Pin Plastic SOIC

AS2208N

AS2208D

0 to 105° C

ASTEC Semiconductor

12 3 4 5 6

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