参数资料
| 型号： | MAX17498AATE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC OFF-LINE CONVERTER 16TQFN |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 输出隔离： | 隔离 |
| 频率范围： | 235kHz ~ 265kHz |
| 输入电压： | 4.5 V ~ 29 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（3x3） |
| 包装： | 带卷 (TR) |
MAX17498A/MAX17498B/MAX17498C
AC-DC and DC-DC Peak Current-Mode Converters
for Flyback/Boost Applications
? V OVI
? V START
R SUM = ? ? R OVI + R EN ? ? × ? ? k ?
? V START ?
R SUM
= R = R = k ?
3
Soft-Start
The devices implement soft-start operation for the
flyback /boost converter. A capacitor connected to the
SS pin programs the soft-start period for the flyback/
boost converter. The soft-start feature reduces the input
inrush current. These devices allow the end user to select
between voltage soft-start usually preferred in nonisolat-
ed applications and current soft-start, which is useful in
isolated applications to get a monotonic rise in the output
voltage. See the Programming Soft-Start of the Flyback/
Boost Converter (SS) section.
Spread-Spectrum Factory Option
For EMI-sensitive applications, a spread-spectrum-
enabled version of the device can be requested from
the factory. The frequency-dithering feature modulates
the switching frequency by Q 10% at a rate of 4kHz.
This spread-spectrum-modulation technique spreads
the energy of switching-frequency harmonics over a
wider band while reducing their peaks, helping to meet
stringent EMI goals.
Applications Information
Startup Voltage and Input Overvoltage-
Protection Setting (EN/UVLO, OVI)
The devices’ EN /UVLO pin serves as an enable /disable
input, as well as an accurate programmable input UVLO
pin. The devices do not commence startup operation
unless the EN/UVLO pin voltage exceeds 1.23V (typ).
The devices turn off if the EN/UVLO pin voltage falls
resistor values for the divider can be calculated as fol-
lows, assuming a 24.9k I resistor for R OVI :
?
R EN = R OVI × ? ? 1 ? k ?
?
where R OVI is in k I while V START and V OVI are in volts.
? 1
? 1.23 ?
where R EN and R OVI are in k I . In universal AC input
applications, R SUM might need to be implemented as
equal resistors in series (R DC1 , R DC2 , R DC3 ) so that
voltage across each resistor is limited to its maximum
operation voltage.
DC1 DC2 DC3
For low-voltage DC-DC applications based on the
MAX17498B/MAX17498C, a single resistor can be used
in the place of R SUM , as the voltage across it is
approximately 40V.
V DC
R DC1
below 1.17V (typ). A resistor-divider from the input DC
bus to ground can be used to divide down and apply a
fraction of the input DC voltage (V DC ) to the EN/UVLO
pin. The values of the resistor-divider can be selected
so that the EN/UVLO pin voltage exceeds the 1.23V (typ)
R SUM
R DC2
R DC3
turn-on threshold at the desired input DC bus voltage. The
same resistor-divider can be modified with an additional
resistor (R OVI ) to implement input overvoltage protection
in addition to the EN/UVLO functionality as shown in
the devices stop switching and resume switching opera-
R EN
R OVI
EN/UVLO
OVI
MAX17498A
MAX17498B
MAX17498C
tions only if voltage at the OVI pin falls below 1.17V (typ).
For given values of startup DC input voltage (V START ),
and input overvoltage-protection voltage (V OVI ), the
Maxim Integrated
Figure 2. Programming EN/UVLO and OVI
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17498BATE+ | 功能描述:电流型 PWM 控制器 Univ AC/DC-Iso DC/DC Flyback controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX17498BATE+CER | 功能描述:直流/直流开关转换器 ACDC & DCDC Peak Crnt-Mode Cnvtrs RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX17498BATE+T | 功能描述:电流型 PWM 控制器 MAX17498BATE+T RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX17498BATE+TCER | 功能描述:直流/直流开关转换器 Universal ACDC & Iso DCDC Flyback cntlr RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX17498BEVKIT# | 功能描述:电源管理IC开发工具 MAX17498 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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