参数资料
| 型号： | MAX17497AATE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 23/30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 COUTF = IN PK
DCM Boost
In a DCM boost converter, the inductor current returns to
zero in every switching cycle. Energy stored during the
on-time of the main switch is delivered entirely to the load
in each switching cycle.
Inductance Selection
The design procedure starts with calculating the boost
converter’s input inductor, such that it operates in DCM
at all operating line and load conditions. The critical
inductance required to maintain DCM operation is cal-
voltage deviation, and f C is the target closed-loop cross-
over frequency. f C is chosen to be 1/10 the switching
frequency (f SW ). For the boost converter, the output
capacitor supplies the load current when the main switch
is on, and therefore the output-voltage ripple is a function
of duty cycle and load current. Use the following equa-
tion to calculate the output-capacitor ripple:
I OUTF × L × I
V INMIN × C OUTF
? ( V
) × V
? ? ? ? × 0.4
2 ?
? V
culated as:
L IN ≤
OUTF INMIN INMIN
I OUTF × V OUTF 2 × f SW
Input-Capacitor Selection
The value of the required input capacitor can be calcu-
lated based on the ripple allowed on the input DC bus.
The size of the input capacitor should be based on the
3.75 × I OUTF
C INF = ? ?
?
? 2 × (V OUTF ? V INMIN ) × I OUTF ?
I PK = ? ?
? ?
I CIN_RMS =
? V ) 2 × I
( 2 × V OUTF ? V INMIN ) × I OUTF
2 π ( V OUTF INMIN OUTF OUTF
) × V
f P =
C OUT = STEP RESPONSE
? 0.1 × f SW ?
230 × V OUTF
?
ms ?
? ?
where V INMIN is the minimum input voltage.
Peak/RMS Current Calculation
To set the current limit, the peak current in the inductor
can be calculated as:
=
I LIMF I PK × 1.2
where I PK is given by:
L INMIN × f SWMIN
L INMIN is the minimum value of the input inductor, taking
into account tolerance and saturation effects. f SWMIN is
the minimum switching frequency for the MAX17497B
from the Electrical Characteristics 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
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:
I × t
? V OUTF
RMS value of the AC current handled by it. The calcula-
tions are as:
? ?
V INMIN × f SWMIN × (1 ? D MAX ) ?
The capacitor RMS can be calculated as:
I PK
2 × 3
Error-Amplifier Compensation Design
The DC gain of the power stage is given as:
2 × (V OUTF ? V INMIN ) × f SW × V OUTF 2 × L IN
G DC =
(2V OUTF INMIN OUTF
The loop-compensation values for the error amplifier can
be calculated as:
? V × C
where V INMIN is the minimum operating input voltage
and I OUTF is the maximum load current.
2
R Z
= × 1 + ? ? × ? 1 + ?
GDC f P ? mp ?
+
t RESPONSE ? (
0.33 1
f C f SW
)
where ms = default slope compensation and mp =
V INMIN /L x 0.5.
where I STEP is the load step, t RESPONSE is the response
time of the controller, D V OUTF is the allowable output-
Maxim Integrated
23
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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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