参数资料
| 型号： | MAX17497AATE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 22/30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 SECPEAK 2 + ? ? ? ( I SECPEAK × ? I SEC )
? ? I 2 ?
? ?
? V COUTF = MAX
I SECRMS
=
SEC
? 3 ?
I OUTF × D
f SW × C OUTF
? V INMIN × D MAX ?
? L PRI SW × K ?
? I SEC = ?
2 × π × D MAX PRI OUTF × K 2
× 1 ? D MAX 2
where D I SEC is the ripple current in the secondary current
waveform, and is given by:
× f
Current-limit setting the peak current can be calculated
as follows:
I LIMF
= I PRIPEAK × 1.2
Primary RCD Snubber Selection
The design procedure for RCD snubber selection is iden-
tical to that outlined in the DCM Flyback section.
Output-Capacitor Selection
X7R ceramic output capacitors are preferred in industrial
applications due to their stability over temperature. The
output capacitor is usually sized to support a step load
Input-Capacitor Selection
The design procedure for input capacitor selection is
identical to that outlined in the DCM Flyback section.
External MOSFET Selection
The design procedure for external MOSFET selection is
identical to that outlined in the DCM Flyback section.
Secondary Diode Selection
The design procedure for secondary diode selection is
identical to that outlined in the DCM Flyback section.
Error-Amplifier Compensation Design
In the CCM flyback converter, the primary inductance
and the equivalent load resistance introduces a right
half-plane zero at the following frequency:
(1 ? D MAX ) 2 × V OUTF
f ZRHP =
× L × I
The loop-compensation values are calculated as:
? f RHP ?
? 5 × f P ?
of 50% of the maximum output current in the application,
such that the output-voltage deviation is contained to 3%
of the output-voltage change. The output capacitance
can be calculated as:
R Z
=
200 × I OUTF
(1 ? D MAX )
× K 1 + ? ?
2
× ( 1 + D MAX )
C OUTF = STEP RESPONSE
I × t
? V OUTF
where f P , the pole due to output capacitor and load, is
given by:
+
t RESPONSE ? (
0.33 1
f C f SW
)
f P =
(1 + D MAX ) × I OUTF
2 × π × C OUTF × V OUTF
f C ≤ ZRHP
where I STEP is the load step, t RESPONSE is the response
time of the controller, D V OUTF is the allowable output
voltage deviation, and f C is the target closed-loop cross-
over frequency. f C is chosen to be less than 1/5 of the
worst-case (lowest) RHP zero frequency (f RHP ). The right
half-plane zero frequency is calculated as:
The above selection sets the loop-gain crossover fre-
quency (f C , where the loop gain equals 1) equal to 1/5
the right half-plane zero frequency:
f
5
With the control-loop zero placed at the load pole fre-
f ZRHP =
(1 ? D MAX ) 2 × V OUTF
2 × π × D MAX × L PRI × I OUTF × K 2
quency:
C Z =
1
2 π × R Z × f P
C P =
For the CCM flyback converter, the output capacitor
supplies the load current when the main switch is on,
and therefore the output-voltage ripple is a function of
load current and duty cycle. Use the following equation
to estimate the output-voltage ripple:
Maxim Integrated
With the high-frequency pole placed at 1/2 the switching
frequency:
1
π × R Z × f SW
22
相关PDF资料 |
PDF描述 |
|---|---|
| MAX17498AATE+T | IC OFF-LINE CONVERTER 16TQFN |
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| MAX17510ATB+T | IC REG DDR LOW VOLTAGE 10-TDFN |
| MAX17528GTJ+T | IC CTLR PWM VID PS 1PH 32-TQFN |
| MAX17535ETG+T | IC SMBUS BATT CHARGER 24TQFN |
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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