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AS2208 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part No. AS2208
Description  Primary Side PWM Controller
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Maker  ETC [List of Unclassifed Manufacturers]
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AS2208 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers

   
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ASTEC Semiconductor
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
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.
AS2208
Primary Side PWM Controller
Preliminary Specification
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
Pin Configuration — Top view
Ordering Information
Package
Temperature Range
Order Code
8-Pin Plastic DIP
0 to 105
° C
AS2208N
8-Pin Plastic SOIC
0 to 105
° C
AS2208D
77
8
1
7
2
GND
6
3
OV
VREG
5
4
RT/CT
OUT
COMP
VCC
ISNS
8L SOIC (D)
PDIP (N)
8
1
7
2
GND
6
3
OV
VREG
5
4
RT/CT
OUT
VCC
ISNS
COMP


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