参数资料
| 型号： | MAX17497AATE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 17/30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) |
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MAX17497A/MAX17497B
AC-DC and DC-DC Peak Current-Mode Converters
with Integrated Step-Down Regulator
R U B × ? ? k ?
? V OUTF ?
Programming the Output Voltage of
the Flyback/Boost Converter (EAFN)
Set the output voltage of the flyback/boost converter by
selecting the correct values for the resistor-divider con-
nected from the flyback/boost output to ground (V OUTF )
with the midpoint of the divider connected to the EAFN
pin ( Figure 8 ). With R B selected in the range of 20k I to
50k I , R U can be calculated as:
= R ? 1
? 1.22 ?
where R B is in k I .
V DC
Programming the Current Limit of the
Flyback/Boost Converter (RLIMF)
The devices include a robust overcurrent-protection
scheme that protects them during overload and short-
circuit conditions. For the flyback/boost converter, the
devices include a cycle-by-cycle peak current limit that
turns off the driver whenever the current into the LXF pin
exceeds an internal limit programmed by the resistor
connected from the RLIMF pin to ground. The devices
include a runaway current limit that protects them during
short-circuit conditions. One occurrence of the runaway
current limit trigger a hiccup mode, protecting the con-
verter 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
R Z
Z D1
6.3V
Q1
D2
MAX17497B
NB
D1
V OUTF
soft-start is attempted again. The R LIMF resistor for a
desired current limit (I PK ) can be calculated as:
R LIMF = 50 × I PK k ?
where I PK is expressed in amperes.
IN
C IN
IN
LDO
LXF
Np
Ns
C OUTF
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
during soft-start operation.
C VCC
V CC
Programming the Slope Compensation for
the Flyback/Boost Converter (SCOMPF)
When both devices operate at maximum duty cycle of
49%, in theory they do not require slope compensation
Figure 7. MAX17497B Typical Startup Circuit with Bias Winding
to Turn Off Q1 and Reduce Power Dissipation
V OUTF
R U
to prevent subharmonic instability that occurs naturally
in continuous peak-current-mode controlled converters
operating at duty cycles greater than 50%. In practice,
the MAX17497A requires a minimum amount of slope
compensation to provide stable, jitter-free operation. The
MAX17497A allows the user to program this default value
of slope compensation simply by connecting the RLIMF
R B
EAFN
MAX17497A
MAX17497B
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.
Figure 8. Programming the Output Voltage of the Flyback/Boost
Converter
Maxim Integrated
17
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17497AEVKIT# | 功能描述:电源管理IC开发工具 MAX17497 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 |
| MAX17497BATE+ | 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 |
| MAX17497BATE+T | 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 |
| 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 |
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