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ACE724C Schematic ( PDF Datasheet ) - ACE Technology

Teilenummer ACE724C
Beschreibung 18V 2A Synchronous PFM/PWM Buck Converter
Hersteller ACE Technology
Logo ACE Technology Logo 




Gesamt 10 Seiten
ACE724C Datasheet, Funktion
ACE724C
18V 2A Synchronous PFM/PWM Buck Converter
Description
The ACE724C is a high efficiency current-mode synchronous, 18V/2A buck converter. Its input voltage
ranges from 3.5V to 18V and it provides an adjustable regulated output voltage from 0.923V to 15V while
delivering up to 2A of output current.
The internal synchronous switches increase efficiency and eliminate the need for an external Schottky
diode. The switching frequency is set to 340KHz. And the ACE724C will automatically switch between
PFM and PWM mode based on the load current, thus to enhance the converter efficiency at light load.
ACE724C consists of many protection block such as UVLO, input voltage over voltage protection to
stand much higher input voltage spike, thermal protection and output short circuit protection.
Features
Adjustable Output Voltage, Vfb=0.923V
Maximum output current is 2A
Range of operation input voltage: Max 18V
UVLO: 3.4V (typ.)
Withstand input voltage spike >30V
Standby current: 1mA (typ.)
Operating current at zero load: 1.2mA (typ.)
Line regulation: 0.1%/V (typ.)
Load regulation: 10mV (typ.)
High efficiency, up to 95%
Environment Temperature: -20~85
Application
Set-top-box
Consumer Electronic Device for automobile
LCD Monitor and LCD TV
Portable DVD
ADSL Modem, WLAN router
Other 12V or double cell Li-ion battery powered device
Absolute Maximum Ratings
Parameter
Symbol Value Unit
Input voltage
30 V
Ambien temperature
Package thermal resistance
SOP-8
ESOP-8
Max Operation junction temperature
TA
ΘJC
Tj
-20~85
45 /W
25
125
ESD (HBM)
>2000 V
Storage temperature range
TS -40~125
Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability.
VER 1.5 1






ACE724C Datasheet, Funktion
ACE724C
18V 2A Synchronous PFM/PWM Buck Converter
Typical performance characteristics
(Vin=12V, Vout=3.3V, L=10uH, Cin=10uF, Cout=22uF, TA=25, unless otherwise stated)
Functional Descriptions
Loop Operation
The ACE724C is a wide input range, high
efficien
of delivering up to 2A of output current, integrated with a 110m synchronous MOSFET, eliminating the
need for external diode. It uses a PWM current
m ode c
between the FB signal and the internal reference voltage. The output of the integrator is then compared to
the sum of a current
rsaemnps.e Tshigisnaolpaenradtitohne gselonpeeracteosmpaePnWsaMtion
signal that modulates the duty cycle of the power MOSFETs to achieve regulation for output voltage.
Current Limit
There is a cycle
5bAy(tcypyc).leWchuerrnetnhtelimcuitrroenntthfleowhinghg‐side MO
out of SW exceeds this limit, the high
‐side M
Unlike the traditional method of current limiting by limiting the voltage at the compensation pin, which
usually has large variation due to duty cycle variance, this type of peak current limiting scheme provides a
relatively more accurate limit for output current, thereby lowering the requirements for system design.
Light Load Operation
Traditionally, a fixed current mode constant frequency PWM DC
itDchCesreegvuelantor alway
when the output load is small. When energy is shuffling back and forth through the power MOSFETs,
power is lost due to the finite RDSONs of the MOSFETs and parasitic capacitances. At light load, this loss
is prominent and efficiency is therefore very low. ACE724C employs a proprietary control scheme that
improves efficiency in this situation by enabling the device into a power save mode during light load,
thereby extending the range of high efficiency operation.
Faster Transient Response
VER 1.5 6

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