参数资料
| 型号： | MAX17497AATE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 18/30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
( V INMIN × D MAX ) 2 × 0.4
( V OUTF D OUTF SW
+ V ) × I
L PRIMAX ≤
The MAX17497A flyback/boost converter can be
designed to operate in discontinuous mode or to enter
into continuous-conduction mode at a specific heavy-
load condition for a given DC input voltage. In continu-
ous-conduction mode, the flyback/boost converter needs
slope compensation to avoid subharmonic instability that
occurs naturally over all specified load and line condi-
tions in peak-current-mode-controlled converters operat-
ing at duty cycles greater than 50%. A minimum amount
of slope signal is added to the sensed current signal
even for converters operating below 50% duty cycles
to provide stable, jitter-free operation. The SCOMPF pin
allows the user to program the necessary slope com-
pensation by setting the value of the R SCOMPF resistor
connected from the SCOMPF pin to ground:
=
R SCOMPF 0.5 S E k ?
where the slope (S E ) is expressed in millivolts per micro-
second.
Step-Down Overcurrent Protection
The devices’ step-down regulator includes a robust
overcurrent-protection scheme that protects them dur-
ing overload and short-circuit conditions. A runaway
current limit on the high-side switch current at 1A (typ)
protects the device under short-circuit conditions. One
occurrence of the runaway current limit trigger a hiccup
mode to protect the converter by immediately suspend-
ing switching for 32ms. This allows the overload current
to decay, due to power loss in the converter resistances,
and load before soft-start is attempted again.
Error Amplifier, Loop Compensation,
and Power-Stage Design of the
Flyback/Boost Converter
The devices’ flyback/boost converter requires that prop-
The flyback/boost converter can be used to implement
the following converters and operating modes:
? Nonisolated flyback converter in discontinuous-
conduction mode (DCM flyback)
? Nonisolated flyback converter in continuous-conduc -
tion mode (CCM flyback)
? Boost converter in discontinuous-conduction mode
(DCM boost)
? Boost converter in continuous-conduction mode
(CCM boost)
Calculations for loop-compensation values (R Z , C Z , and
C P ) for these converter types, and design procedures for
power-stage components, are detailed in the following
sections.
DCM Flyback
Primary Inductance Selection
In a DCM flyback converter, the energy stored in the
primary inductance of the flyback transformer is ideally
delivered entirely to the output. The maximum primary-
inductance value for which the converter remains in
discontinuous mode at all operating conditions can be
calculated as:
× f
where D MAX is 0.35 for the MAX17497A and 0.7 for the
MAX17497B, V D is the forward-voltage drop of the out-
put rectifier diode on the secondary side, and f SW is the
switching frequency of the power converter. Choose the
primary inductance value to be less than L PRIMAX .
er loop compensation be applied to the error-amplifier
output to achieve stable operation. The goal of the com-
pensator design is to achieve the desired closed-loop
bandwidth and sufficient phase margin at the crossover
R Z
C P
COMPF
MAX17497A
MAX17497B
frequency of the open-loop gain-transfer function of the
converter. The error amplifier included in the devices is a
transconductance amplifier. The compensation network
used to apply the necessary loop compensation is shown
Maxim Integrated
C Z
Figure 9. Programming the Output Voltage of the Flyback/Boost
Converter
18
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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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