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부품번호 | ACE727C 기능 |
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기능 | 2A Synchronous Step-Down Converter | ||
제조업체 | ACE Technology | ||
로고 | |||
ACE727C
600KHz, 16V, 2A Synchronous Step-Down Converter
Description
The ACE727C is a fully integrated, high– efficiency 2A synchronous rectified step-down converter. The
ACE727C operates at high efficiency over a wide output current load range.
This device offers two operation modes, PWM control and PFM Mode switching control, which allows a
high efficiency over the wider range of the load.
The ACE727C requires a minimum number of readily available standard external components and is
available in a 6-pin SOT23 ROHS compliant package.
Features
• High Efficiency: Up to 96%
• 600KHz Frequency Operation
• 2A Output Current
• No Schottky Diode Required
• 3.5V to 18V Input Voltage Range
• 0.6V Reference
• Slope Compensated Current Mode Control for Excellent Line and Load Transient Response
• Integrated internal compensation
• Stable with Low ESR Ceramic Output Capacitors
• Over Current Protection with Hiccup-Mode
• Thermal Shutdown
• Inrush Current Limit and Soft Start
• Available in SOT23-6
• -40°C to +85°C Temperature Range
Application
• Distributed Power Systems
• Digital Set Top Boxes
• Flat Panel Television and Monitors
• Wireless and DSL Modems
• Notebook Computer
Absolute Maximum Ratings
Parameter
Max Unit
Supply Voltage VIN
-0.3~20
V
Switch Node Voltage VSW
-0.3~VIN+0.5 V
Boost Voltage VBS
VSW -0.3~VSW+5 V
All other pins
-0.3~6
V
Operating Temperature Range
-40~85
OC
Storage Temperature Range
-65~+150
OC
Lead Temperature (Soldering, 10s)
300
OC
VER 1.2 1
ACE727C
600KHz, 16V, 2A Synchronous Step-Down Converter
DETAILED DESCRIPTION
Internal Regulator
The ACE727C is a current mode step down DC/DC converter that provides excellent transient response
with no extra external compensation components. This device contains an internal, low resistance, high
voltage power MOSFET, and operates at a high 600K operating frequency to ensure a compact, high
efficiency design with excellent AC and DC performance.
Error Amplifier
The error amplifier compares the FB pin voltage with the internal FB reference (VFB) and outputs a
current proportional to the difference between the two. This output current is then used to charge or
discharge the internal compensation network to form the COMP voltage, which is used to control the
power MOSFET current. The optimized internal compensation network minimizes the external component
counts and simplifies the control loop design.
Internal Soft-Start
The soft-start is implemented to prevent the converter output voltage from overshooting during startup.
When the chip starts, the internal circuitry generates a soft-start voltage (SS) ramping up from 0V to 0.6V.
When it is lower than the internal reference (REF), SS overrides REF so the error amplifier uses SS as
the reference. When SS is higher than REF, REF regains control. The SS time is internally fixed to 1ms.
Over-Current-Protection and Hiccup
The ACE727C has cycle-by-cycle over current limit when the inductor current peak value exceeds the
set current limit threshold. Meanwhile, output voltage starts to drop until FB is below the Under-Voltage
(UV) threshold, typically 30% below the reference. Once a UV is triggered, the ACE727C enters hiccup
mode to periodically restart the part. This protection mode is especially useful when the output is
dead-short to ground. The average short circuit current is greatly reduced to alleviate the thermal issue
and to protect the regulator. The ACE727C exits the hiccup mode once the over current condition is
removed.
Startup and Shutdown
If both VIN and EN are higher than their appropriate thresholds, the chip starts. The reference block
starts first, generating stable reference voltage and currents, and then the internal regulator is enabled.
The regulator provides stable supply for the remaining circuitries. Three events can shut down the chip:
EN low, VIN low and thermal shutdown. In the shutdown procedure, the signaling path is first blocked to
avoid any fault triggering. The COMP voltage and the internal supply rail are then pulled down. The
floating driver is not subject to this shutdown command.
VER 1.2 4
4페이지 ACE727C
600KHz, 16V, 2A Synchronous Step-Down Converter
ELECTRICAL PERFORMANCE
Tested under, L=4.7uH, TA=25℃, unless otherwise specified
Efficiency vs. Iout
(Vout=1.2V)
Efficiency vs. Iout
(Vout=3.3V)
Iout (A)
Efficiency vs. Iout
(Vout=5.0V)
Iout (A)
Vout vs. Iout
(Vout=1.2V)
Iout (A)
Iout (A)
VER 1.2 7
7페이지 | |||
구 성 | 총 10 페이지수 | ||
다운로드 | [ ACE727C.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
ACE727C | 2A Synchronous Step-Down Converter | ACE Technology |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |