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ASTEC

AS2214 Datasheet Preview

AS2214 Datasheet

Primary Side PWM Controller

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AS2214
Primary Side PWM Controller
Features
Low Startup Current
Bulk and AC sensing
Soft Start
Single-start or auto-restart
modes
Oscillator trimmed for precision
duty cycle clamp
Standard temperature range
extended to 105°C
Remote on / off control
Buffered Ramp for slope
compensation
Standard current mode control
Description
The AS2214 is a full featured, pulse width modulation
controller. Based on an improved AS3842, the AS2214
provides additional features that reduce component count
and improve specifications in a wide range of power supply
designs. The added functionality includes AC power and
bulk voltage sensing, over-voltage input, as well as the ability
to latch off or bounce through different fault conditions.
The PWM function is controlled by the current sense com-
parator for normal current mode control and a second
comparator for voltage mode soft start. A buffered RAMP
signal is available for slope compensation without loading
the oscillator. The output stage is a high current totem pole
output that sees only 85 ns delay from the PWM comparator.
The AS2214 requires less than 10µA of startup current. The
undervoltage lockout (UVLO) thresholds are nominally 13.8V
for turn on and 8 V for turn off. A precision 2.5 V bandgap
reference serves as an input for the error amplifier. The
oscillator discharge current is trimmed to provide guaran-
teed duty cycle clamping.
Pin Configuration Top view
VCC 1
VREG 2
COMP 3
VFB 4
ISNS 5
SS 6
RAMP 7
14 OUT
13 GND
12 BOK
11 LEN
10 ACP
9 OV
8 RT/CT
Ordering Information
Package
14-Pin Plastic DIP
ASTEC Semiconductor
Temperature Range
0 to 105° C
83
Order Code
AS2214N




ASTEC

AS2214 Datasheet Preview

AS2214 Datasheet

Primary Side PWM Controller

No Preview Available !

AS2214
Primary Side PWM Controller
Functional Block Diagram
ACP
LEN
AC
DETECT
V REG
(LEN)
6V
5V enab le
5V Reg.
VCC
V REG
50µA
BOK
2V 5
OV
ISNS
COMP
3V 95
2V 5
(BULK_UV )
(CLR)
(OV )
UV LO
V REG
6µA
SS LOGIC
(RUN)
SS
VFB
2V 5
2R CM PWM
1V R
(PWM)
VCC
OUT
RT/CT
OSC
SS PWM
(BLA NK)
GND
RAMP
x1
ASTEC Semiconductor
84


Part Number AS2214
Description Primary Side PWM Controller
Maker ASTEC
Total Page 8 Pages
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