參數(shù)資料
型號(hào)： MAX8540
廠商： Maxim Integrated Products, Inc.
英文描述： Synchronizable. High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies
中文描述： 可同步、高頻、電流或電壓模式PWM控制器，用于隔離電源
文件頁(yè)數(shù)： 1/16頁(yè)
文件大?。?/td> 328K
代理商： MAX8540
General Description
The MAX8540/MAX8541 pulse-width-modulated (PWM)
controllers for forward/flyback isolated DC-to-DC convert-
ers provide maximum flexibility to power-supply design-
ers and reduce external component count. These
controllers allow common PC board layout for current-
mode (MAX8540) and voltage-mode (MAX8541) designs.
Both controllers feature adjustable switching frequency
and external synchronization from 200kHz to 1MHz.
Active-high and active-low enable, undervoltage pro-
tection (UVP), and overvoltage protection (OVP) reduce
external component count.
Maximum duty cycle is adjustable, and the feed-forward
function scales the maximum duty cycle with input volt-
age to limit the maximum volt-seconds applied to the
transformer primary. The MAX8540 allows the user to
select the value of slope compensation to further opti-
mize magnetics design. The MAX8541 features user-
adjustable ramp magnitude for the PWM comparator.
A cycle-by-cycle current-limit function controls the peak
primary current during overload and short circuit. Both
controllers can be set to latch off or to hiccup when a
short circuit is detected. The number of current-limited
cycles to initiate the hiccup mode and number of
cycles skipped are user selectable to allow startup with
high-capacitance loads and protect the converter
against sustained short circuits.
The MAX8540/MAX8541 feature 9
internal gate dri-
vers for low-power applications and are compatible
with external gate drivers for high-power applications.
Both devices are available in the space-saving 16-pin
QSOP package.
The MAX8541 EV kit evaluates the MAX8540 and the
MAX8541 to speed designs. Design examples are also
available in application notes:
50W Voltage-Mode
Forward Converter Design with the MAX8541
and
50W
Current-Mode Forward Converter Design with the
MAX8540.
Applications
Isolated DC-to-DC Modules (Bricks)
Cellular Base Stations
Telecom and Network Systems
High-Performance Off-Line AC/DC Converters
Features
o
200kHz to 1MHz Adjustable Switching Frequency
o
Synchronization to External Clock
o
Programmable, Constant Maximum Volt-Second
Simplifies Transformer Design
o
Programmable Hiccup/Skip Cycles or Latch-Mode
Protection
o
Clean Startups with High-Capacitance Loads
o
Programmable Under/Overvoltage Protection
o
Current-Mode, Adjustable Slope Compensation
(MAX8540)
o
Voltage-Mode, Adjustable Ramp Magnitude
(MAX8541)
o
10mA, 5V Regulator
o
75mV to 1.25mV Adjustable Current Limit
Reduces External Components
o
Internal Gate Driver for Low-Power Applications
o
External Gate Driver for High-Power Applications
M
Synchronizable, High-Frequency Current- and
Voltage-Mode PWM Controllers for Isolated Supplies
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
Ordering Information
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
REF
V
CC
DRV
GND
SKTON
CS
SKTOFF
ILIM
OPTO
TOP VIEW
MAX8540EEE
QSOP
OV
UV
MAXDTY
FREQ/SYNC
SS
EN
SCOMP
Pin Configurations
19-2830; Rev 0; 4/03
EVAVAILABLE
PART
TEMP RANGE
-40
°
C to +85
°
C
-40
°
C to +85
°
C
PIN-PACKAGE
16 QSOP
16 QSOP
MAX8540
EEE
MAX8541
EEE
Functional Diagrams and Typical Operating Circuit appear
at end of data sheet.
Pin Configurations continued at end of data sheet.
相關(guān)PDF資料
PDF描述
MAX8541 Synchronizable. High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies
MAX8540EEE Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies
MAX8541EEE Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies
MAX8540-MAX8541 Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies
MAX8545 Low-Cost. Wide Input Range. Step-Down Controllers with Foldback Current Limit
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX8540EEE 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX8540EEE+ 功能描述:電流型 PWM 控制器 Synchronizable PWM Controller RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX8540EEE+T 功能描述:電流型 PWM 控制器 PWM Controller Curr-Mode RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX8540EEE-T 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX8541EEE 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
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