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参数资料
| 型号： | MAX17498AATE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC OFF-LINE CONVERTER 16TQFN |
| 标准包装： | 100 |
| 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： | 管件 |
MAX17498A/MAX17498B/MAX17498C
AC-DC and DC-DC Peak Current-Mode Converters
for Flyback/Boost Applications
MAX17498B
MAX17498C
Current-Limit Programming (LIM)
The devices include a robust overcurrent-protection
scheme that protects the device under overload and
short-circuit conditions. For the flyback/boost con-
verter, the devices include a cycle-by-cycle peak
current limit that turns off the driver whenever the
current into the LX pin exceeds an internal limit that is
programmed by the resistor connected from the LIM
pin to GND. The devices include a runaway current limit
that protects the device under short-circuit conditions.
One occurrence of the runaway current limit triggers a
hiccup mode that protects the converter by immediately
suspending switching for a period of time (32ms). This
allows the overload current to decay due to power loss in
the converter resistances, load, and the output diode of
the flyback/boost converter before soft-start is attempted
again. The resistor at the LIM pin for a desired current
limit (I PK ) can be calculated as:
R LIM = 50 × I PK k ?
V OUT
R U
MAX17498A
EA- MAX17498B
MAX17498C
R B
Figure 7. Programming the Positive Output Voltage
V OUT
REF
MAX17498A
EA- R1
R2
where I PK is expressed in amperes.
For a given peak current-limit setting, the runaway
current limit is typically 20% higher. The runaway current-
limit-triggered hiccup operation is always enabled even
R EA-
EA+
during soft-start.
Programming Slope Compensation (SLOPE)
When the MAX17498A//MAX17498B/MAX17498C devic-
es operate at a maximum duty cycle of 49%, in theory
they do not require slope compensation for preventing
subharmonic instability that occurs naturally in continu-
ous-mode peak current-mode-controlled converters. In
practice, the devices require a minimum amount of slope
compensation to provide stable, jitter-free operation.
These devices allow the user to program this default value
of slope compensation simply by connecting the SLOPE
pin to V CC . It is recommended that discontinuous-mode
designs also use this minimum amount of slope compen-
sation to provide noise immunity and jitter-free operation.
To avoid subharmonic instability that occurs naturally
over all specified load and line conditions in peak cur-
Maxim Integrated
Figure 8. Programming the Negative Output Voltage
rent-mode-controlled converters operating at duty cycles
greater than 50%, the converter needs slope compen-
sation. A minimum amount of slope signal is added to
the sensed current signal even for converters operating
below 50% duty to provide stable, jitter-free operation.
The SLOPE pin allows the user to program the necessary
slope compensation by setting the value of the resistor
(R SLOPE ) connected from SLOPE pin to ground.
R SLOPE = 0.5 × S E k ?
where the slope (S E ) is expressed in millivolts per micro-
second.
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17498AATE+ | 功能描述:电流型 PWM 控制器 Uvrsl AC/DC & Iso DC/DC Flyback ctlr 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 |
| MAX17498AATE+T | 功能描述:电流型 PWM 控制器 Uvrsl AC/DC & Iso DC/DC Flyback ctlr 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+ | 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 |
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