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AP2014NA Datasheet(PDF) 10 Page - Anachip Corp

Part # AP2014NA
Description  Synchronous PWM Controller
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Manufacturer  ANACHIP [Anachip Corp]
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AP2014NA Datasheet(HTML) 10 Page - Anachip Corp

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AP2014/A
Synchronous PWM Controller
Anachip Corp
www.anachip.com.tw
Rev. 1.2 Nov 29, 2005
10/12
Function Descriptions
Introduction
The AP2014 is a fixed frequency, voltage mode
synchronous controller and consists of a precision
reference voltage, an error amplifier, an internal
oscillator, a PWM comparator, 0.5A peak gate driver,
soft-start
and
shutdown
circuits
(see
Block
Diagram).
The output voltage of the synchronous converter is
set and controlled by the output of the error amplifier;
this is the amplified error signal from the sensed
output voltage and the reference voltage.
This voltage is compared to a fixed frequency linear
sawtooth ramp and generates fixed frequency
pulses of variable duty-cycle, which drives the two
N-channel external MOSFETs.The timing of the IC
is provided through an internal oscillator circuit
which uses on-chip capacitor to set the oscillation
frequency to 200 KHz (400 KHz for “A” version).
Soft-Start
The AP2014 has a programmable soft-start to
control the output voltage rise and limit the current
surge at the start-up. To ensure correct start-up, the
soft-start sequence initiates when the VC and VCC
rise
above
their
threshold
(3.3V
and
4.2V
respectively) and generates the Power On Reset
(POR) signal.
Soft-start function operates by
sourcing an internal current to charge an external
capacitor to about 3V. Initially, the soft-start function
clamps the E/A’s output of the PWM converter. As
the charging voltage of the external capacitor ramps
up, the PWM signals increase from zero to the point
the feedback loop takes control.
Short-Circuit Protection
The outputs are protected against the short circuit.
The AP2014 protects the circuit for shorted output
by sensing the output voltage (through the external
resistor divider). The AP2014 shuts down the PWM
signals, when the output voltage drops below 0.6V
(0.4V for AP2014A).
The
AP2014
also
protects
the
output
from
over-voltaging when the control FET is shorted.
This is done by turning on the sync FET with the
maximum duty cycle.
Under-Voltage Lockout
The under-voltage lockout circuit assures that the
MOSFET driver outputs remain in the off state
whenever the supply voltage drops below set
parameters. Lockout occurs if VC and VCC fall below
3.3V and 4.2V respectively. Normal operation
resumes once VC and VCC rise above the set values.
IC Quiescent Power Dissipation
Power dissipation for IC controller is a function of
applied voltage, gate driver loads and switching
frequency. The IC's maximum power dissipation
occurs when the IC operating with single 12V supply
voltage (Vcc=12V and Vc 24V) at 400KHz switching
frequency and maximum gate loads.
Page 8 show voltage vs. current, when the
gate drivers loaded with 1500pF capacitors. The IC's
power dissipation results to an excessive
temperature rise. This should be considered when
using AP2014A for such application.
Marking Information
(Top View)
SOP-8L/PDIP-8L
AP2014 X
YY WW X
Logo
Part No.
ID code: internal
Year: "01" =2001
"02" =2002
Xth week: 01~52
5
8
4
1
AP2014 : 200KHz (OSC)
AP2014A : 400KHz (OSC)


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