Primary Side PWM Controller
Preliminary Specification
Features
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
碌A(chǔ)
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.
Top view
AS2208
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Low Startup Current
Single-start or auto-restart
modes
Oscillator trimmed for precision
duty cycle clamp
Standard temperature range
extended to 105擄C
Remote on / off control
Self limiting supply Voltage
Standard current mode control
Pin Configuration
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PDIP (N)
COMP
ISNS
RT/CT
OV
1
2
3
4
8L SOIC (D)
8
7
6
5
VREG
VCC
OUT
GND
COMP
ISNS
RT/CT
OV
1
2
3
4
8
7
6
5
VREG
VCC
OUT
GND
Ordering Information
Package
Temperature Range
Order Code
8-Pin Plastic DIP
8-Pin Plastic SOIC
0 to 105擄 C
0 to 105擄 C
AS2208N
AS2208D
ASTEC Semiconductor
77
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英文版
Primary Side PWM Controller
ETC
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英文版
Primary Side PWM Controller
ETC [ETC]
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英文版
Primary Side PWM Controller
ETC [ETC]
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英文版
Primary Side PWM Controller
ETC
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英文版
Primary Side PWM Controller
ETC [ETC]
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英文版
Primary Side PWM Controller
ETC
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英文版
Primary Side PWM Controller
ETC [ETC]
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英文版
Primary Side PWM Controller
ETC
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英文版
Primary Side PWM Controller
ETC [ETC]
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