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ACE710C Datenblatt(PDF) 6 Page - ACE Technology Co., LTD.

Teilenummer ACE710C
Bauteilbeschribung  1A Synchronous PWM Boost converter
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Hersteller  ACE [ACE Technology Co., LTD.]
Direct Link  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

ACE710C Datenblatt(HTML) 6 Page - ACE Technology Co., LTD.

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ACE710C
1A Synchronous PWM Boost converter
VER 1.1
6
Detailed description
ACE710C is a low input voltage start up, current mode DC-
DC step up converter. It’s operation can be
best understood by referring to the block diagram. Upon starting up, the low voltage startup circuitry
drives SW with on-off cycles, transferring energy from input to OUT by storing energy in the inductor
during on-time and releasing it to the output during off-time. When OUT is high enough, the startup circuit
turns off and the main controller takes over. The main control loop consists of a reference, a GM error
amplifier, a PWM controller, a current sense amplifier, an oscillator, a PWM logic control, and it is power
stage including its driver. The main control loop is a classic current mode control loop. The GM stage
integrates the error between FB and REF, and its output is used to compare with a triangular wave which
the summing result of the current sense amplifier output and a slope compensation voltage. The output of
the comparator is used to drive the power stage to reach regulation.
APPLICATION INFORMATION
Inductor selection
With switching frequency up to 1MHz, small surface mount inductors can be used with values from
2.2uH to 4.7uH.For a given chosen inductor value and application conditions make sure the peak inductor
current does not exceed the maximum current rating of the selected vendor's inductor.
Input and output capacitor selection
The ACE710C's bootstrap architecture allows the use of very small input capacitor. For applications that
only need to drive small output load current, the input capacitor is optional, because once output is started
up, the IC's is powered by OUT, a quiet power supply.
The output capacitor is used to stabilize the loop and provide ac current to the load. A low ESR ceramic
cap with values from 2.2uF to 22uF can be used.
Smaller
value
capacitors
are
generally cheaper
with
small
footprints,
while
larger capacitor
provides
lower
ripples
and
better transient load
responses. Also, when extreme low startup voltage is needed, larger output capacitors are needed for the
part to startup under heavy load condition.


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