参数资料
| 型号： | MAX17498AATE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/20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) |
MAX17498A/MAX17498B/MAX17498C
AC-DC and DC-DC Peak Current-Mode Converters
for Flyback/Boost Applications
IN
C IN
IN
LDO
MAX17498B
MAX17498C
V CC
LX
V DC
C VCC
Np
Ns
D1
V OUT
C OUT
the MAX17498B/MAX17498C can be tolerated, the IN
pin is directly connected to the DC input, as shown in
(e.g., 16V to 32V DC), a startup circuit, such as that
shown in Figure 6 , can be used to minimize power dis-
sipation. In this startup scheme, the transistor (Q1)
supplies the switching current until a bias winding NB
comes up and turns off Q1. The resistor (R Z ) can be
calculated as:
2 ×
R Z = (V INMIN ? 6.3) k ?
where V INMIN is the minimum input DC voltage.
Programming Soft-Start of the
Flyback/Boost Converter (SS)
The soft-start period in the voltage soft-start scheme of
V OUT
Q1
MAX17498B
MAX17498C
IN
R U B × ? ? k ?
? V OUT ?
V START
V BEQ1
R2 = OUT ? k ?
R1 × ?
Figure 5. MAX17498B/MAX17498C Typical Startup Circuit with
IN Connected Directly to DC Input
V DC
D2
R Z
D1
Z D1 NB
6.3V
C OUT
IN
LDO
LX Np Ns
C IN
V CC
C VCC
Figure 6. MAX17498B/MAX17498C Typical Startup Circuit with
Bias Winding to Turn Off Q1 and Reduce Power Dissipation
Resistors R SUM and R ISRC can be calculated as:
R SUM
= M ?
10
R ISRC
= M ?
70
The IN UVLO wakeup threshold of the MAX17498B/
MAX17498C is set to 3.9V (typ) with a 200mV hyster-
esis, optimized for low-voltage DC-DC applications
down to 4.5V. For applications where the input DC
voltage is low enough (e.g., 4.5V to 5.5V DC) that the
power loss incurred to supply the operating current of
Maxim Integrated
the devices can be programmed by selecting the value
of the capacitor connected from the SS pin to GND.
The capacitor C SS can be calculated as:
SS
C = 8.13 × t SS nF
where t SS is expressed in ms.
The soft-start period in the current soft-start scheme
depends on the load at the output and the soft-start
capacitor.
Programming Output Voltage
The devices incorporate a flexible error amplifier that
allows regulating to both the positive and negative
outputs. The positive output voltage of the converter
can be programmed by selecting the correct values
for the resistor-divider connected from V OUT , the fly-
back /boost output to ground, with the midpoint of the
divider connected to the EA- pin ( Figure 7 ). 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 .
The negative output voltage of the converter can be
programmed by selecting the correct values for the
resistor-divider connected from V OUT , the flyback /boost
output to REF with the midpoint of the divider connected
to the EA+ pin ( Figure 8 ). With R1 selected in the range
of 20k I to 50k I , R2 can be calculated as:
? V ?
? 1.22 ?
where R1 is in k I .
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17498BATE+ | 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 |
| MAX17498BATE+CER | 功能描述:直流/直流开关转换器 ACDC & DCDC Peak Crnt-Mode Cnvtrs RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX17498BATE+T | 功能描述:电流型 PWM 控制器 MAX17498BATE+T 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 |
| MAX17498BATE+TCER | 功能描述:直流/直流开关转换器 Universal ACDC & Iso DCDC Flyback cntlr RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX17498BEVKIT# | 功能描述:电源管理IC开发工具 MAX17498 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 |
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