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AP2014ASMG Datasheet(PDF) 5 Page - Diodes Incorporated

Part # AP2014ASMG
Description  SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

AP2014ASMG Datasheet(HTML) 5 Page - Diodes Incorporated

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AP2014/A
SYNCHRONOUS PWM DC-DC BUCK CONTROLLER
DS30883 Rev. 1 - 0
5 of 13
AP2014/A
www.diodes.com
© Diodes Incorporated
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.
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 PWM DC-DC controller IC 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.
Typical Application Circuit


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