AS2214N データシートの表示（PDF） - Astec Semiconductor => Silicon Link
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AS2214N Datasheet PDF : 8 Pages
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AS2214
Primary Side PWM Controller
Pin Function Description
Pin Number Function
1
VCC
2
VREG
3
COMP
4
VFB
5
ISNS
6
SS
7
RAMP
8
RT/CT
9
OV
10
ACP
11
LEN
12
BOK
13
GND
14
OUT
Description
Positive supply voltage for the IC.
Output of 5V series regulator.
This pin is the error amplifier output. Typically used to provide loop compensation to
maintain VFB at 2.5 V.
Inverting input of the error amplifier. The non-inverting input is a trimmed 2.5 V
bandgap reference.
A voltage proportional to inductor current is connected to this pin. The PWM uses this
information to terminate the gate drive of the output.
This pin provides a 6µA current source to linearly charge an external capacitor. This pin
is compared to the RAMP pin in the soft start comparator, terminating output pulses when
RAMP goes above the SS voltage.
This pin is a level-shifted and buffered oscillator signal used to provide slope compensa-
tion to the current sense signal. The pin also serves as the non-inverting input of the soft-
start comparator.
Oscillator frequency and maximum duty cycle are set by connecting a resistor (RT) to
VREG and a capacitor (CT) to ground.
This pin latches SS low when pulled above 2.5 V. The latch can be reset by pulling
OV above 4 V then back to ground.
This pin detects the presence of AC signal and drives LEN high.
This pin must be high to enable starting. The pin can also clear all latches by going low
then high.
This pin monitors the bulk voltage through a resistor divider and, when BOK exceeds
2.5 V, provides a 50µA current source for hysteresis. When BOK drops below 2.5V, SS
is pulled low and the hysteresis current is turned off. Auto-restart after a brown-out is
possible.
Circuit common ground.
This totem pole output is designed to directly drive a power MOSFET switch capable of
sourcing and sinking peak currents up to 1 A.
ASTEC Semiconductor
86
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