参数资料
| 型号： | MAX17497AATE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 26/30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
I LXF_RMS = OUTF MAX
( )
2 × R
= P OUT × ( ? 1) ? I OUTB DC
P LOSSBUCK
Internal MOSFET RMS Current Calculation
The voltage stress on the internal MOSFET, whose drain
is connected to LXF, ideally equals the sum of the output
voltage and the forward drop of the output diode. In prac-
tice, voltage overshoot and ringing occur due to action
of circuit parasitic elements during the turn-off transition.
The devices’ maximum rating of the internal nMOSFET
is 65V, making it possible to design boost converters
with output voltages up to 48V, with sufficient margin for
voltage overshoot and ringing. The RMS current into LXF
is useful in estimating the conduction loss in the internal
nMOSFET and is given as:
I × D
(1 ? D MAX )
where D MAX is the duty cycle at the lowest operating
input voltage and I OUTF is the maximum load current.
Thermal Considerations
It should be ensured that the junction temperature of the
devices does not exceed +125 N C under the operating
conditions specified for the power supply. The power dis-
sipated in the devices to operate can be calculated using
the following equation:
IN
P = V IN × I IN
capacitance of the internal MOSFET being lost when
the MOSFET turns on and discharges the drain-source
capacitance voltage to zero. This loss is estimated as:
P CAP = 0.5 × C DS × V DSMAX 2 × f SW
The internal step-down regulator also has similar losses
that affect the temperature rise of the part. These losses
are estimated as:
1
η
where E is the efficiency of the internal step-down
regulator at the output current (I OUTB ), and R DC is the
DC resistance of the output inductor.
The total power loss in the devices can be calculated
from the following equation:
P IN + P
P LOSS = CONDUCTION + P TRANSITION + P CAP
+ P LOSSBUCK
The maximum power that can be dissipated in the
devices is 1666mW at +70 N C temperature. The power-
dissipation capability should be derated as the tem-
perature rises above +70 N C at 21mW/ N C. For a multilayer
board, the thermal-performance metrics for the package
where V IN is the voltage applied at the IN pin and I IN is
operating supply current.
are given below:
θ JA = 48 ° C/ W
The internal nMOSFET experiences conduction loss and
transition loss when switching between on and off states.
These losses are calculated as:
=
P CONDUCTION I LXF_RMS 2 × R DSON_LXF
P TRANSITION = 0.5 × V INMAX × I PK × ( t R + t F ) × f SW
where t R and t F are the rise and fall times of the internal
nMOSFET in CCM operation. In DCM operation, because
the switch current starts from zero only, t F exists and the
transition loss equation changes to:
P TRANSITION = 0.5 × V INMAX × I PK × t F × f SW
Additional loss occurs in the system in every switch-
ing cycle due to energy stored in the drain-source
Maxim Integrated
θ JC = 10 ° C/ W
The junction temperature rise of the devices can be
estimated at any given maximum ambient temperature
(T A_MAX ) from the following equation:
J_MAX
T = T A_MAX + ( θ JA × P LOSS )
If the application has a thermal-management system that
ensures that the devices’ exposed pad is maintained at a
given temperature (T EP_MAX ) by using proper heatsinks,
then the junction temperature rise can be estimated at
any given maximum ambient temperature from the fol-
lowing equation:
T J_MAX
= T EP_MAX + ( θ JC × P LOSS )
26
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相关代理商/技术参数 |
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|---|---|
| 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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