参数资料
| 型号： | MAX17498AATE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/20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
Pin Description (continued)
PIN
13
14
15
16
—
NAME
PGOOD
PGND
LX
IN
EP
(SGND)
FUNCTION
Open-Drain Output. PGOOD goes high when EA- is within 5% of the set point. PGOOD pulls low when
EA- falls below 92% of its set-point value.
Power Ground for Converter
External Transformer/Inductor Connection for the Converter
Internal Linear Regulator Input. Connect IN to the input-voltage source. Bypass IN to PGND with a 1μF
(min) ceramic capacitor.
Exposed Pad. Internally connected to SGND. Connect EP to a large copper plane at SGND potential to
provide adequate thermal dissipation. Connect EP (SGND) to PGND at a single point.
Detailed Description
The MAX17498A offers a bootstrap UVLO wakeup level
of 20V with a wide hysteresis of 15V (min) optimized
for implementing an isolated and nonisolated universal
(85V AC to 265V AC) offline single-switch flyback
converter or telecom (36V to 72V) power supplies. The
MAX17498B/MAX17498C offer a UVLO wakeup level of
4.4V and are well suited for low-voltage DC-DC flyback/
boost power supplies. An internal reference (1.22V)
can be used to regulate the output down to 1.23V in
nonisolated flyback and boost applications. Additional
semi-regulated outputs, if needed, can be generated
by using additional secondary windings on the flyback
converter transformer. A flexible error amplifier and REF
allow the end-user selection between regulating positive
and negative outputs.
The devices utilize peak current-mode control and exter-
nal compensation for optimizing the loop performance for
various inductors and capacitors. The devices include a
runaway current limit feature that triggers hiccup mode
operation to protect the external component by halting
switching for 32ms before restart. The devices include
voltage soft-start for nonisolated designs and current
soft-start for isolated designs to allow monotonic rise of
the output voltage. The voltage or current soft-start can
be selected using the SLOPE pin. See the Block Diagram
for more information.
Input Voltage Range
The MAX17498A has different rising and falling UVLO
thresholds on the IN pin than those of the MAX17498B/
MAX17498C. The thresholds for the MAX17498A are
optimized for implementing power-supply startup
schemes typically used for offline AC-DC power supplies.
Maxim Integrated
The MAX17498A is therefore well suited for opera-
tion from the rectified DC bus in AC-DC power-supply
applications typically encountered in front-end industrial
power-supply applications. As such, the MAX17498A
has no limitation on the maximum input voltage as long
as the external components are rated suitably and the
maximum operating voltages of the MAX17498A are
respected. The MAX17498A can successfully be used
in universal input-rectified (85V to 265V AC) bus applica-
tions, rectified 3-phase DC bus applications, and tele-
com (36V to 72V DC) applications.
The MAX17498B/MAX17498C are intended for imple-
menting a flyback (isolated and nonisolated) and
boost converter with an on-board 65V rated n-channel
MOSFET. The IN pin of the MAX17498B/MAX17498C has
a maximum operating voltage of 36V. The MAX17498B/
MAX17498C implement rising and falling thresholds on
the IN pin that assume power-supply startup schemes,
typical of lower voltage DC-DC applications, down to an
input voltage of 4.5V DC. Therefore, flyback converters
with a 4.5V to 36V supply voltage range can be imple-
mented with the MAX17498B/MAX17498C.
Internal Linear Regulator (V CC )
The internal functions and driver circuits are designed
to operate from a 5V Q 5% power-supply voltage. The
devices have an internal linear regulator that is powered
from the IN pin and generates a 5V power rail. The output
of the linear regulator is connected to the V CC pin and
should be decoupled with a 2.2μF capacitor to ground
for stable operation. The V CC converter output supplies
the operating current for the devices. The maximum
operating voltage of the IN pin is 29V for the MAX17498A
and 36V for the MAX17498B/MAX17498C.
9
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相关代理商/技术参数 |
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|---|---|
| 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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