- 您现在的位置：买卖IC网 > PDF目录20753 > MAX1698AEUB+T (Maxim Integrated)IC LED DRVR WT/CLR BCKLGT 10MSOP PDF资料下载
参数资料
| 型号： | MAX1698AEUB+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WT/CLR BCKLGT 10MSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 拓扑： | 升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 颜色，白色 LED |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 60V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
High-Efficiency Step-Up
Current Regulator for LEDs
Transistor Selection
The MAX1698/MAX1698A drive an external N-channel
MOSFET. Since the gate drive voltage is derived from
REF
V CC , best performance is achieved with low-threshold
NFETs that specify on-resistance with gate-source volt-
MAX1698
MAX1698A
ADJ
GND
500k
ages (V GS ) at the voltage supplied at V CC or less. For
best results, minimize the FET’s R DS(ON) . The external
NFET’s maximum drain-to-source voltage (V DS(MAX) )
must exceed the output voltage.
Catch Diode (D1) Selection
I LED =
Figure 3. Adjusting LED Current
shows the standard method of setting the ADJ voltage.
Use the following equation to determine I LED :
V ADJ
4 . 16 ? R FB
where V ADJ is the voltage at ADJ. Note that ADJ volt-
ages below 50mV turn the LEDs off.
Inductor Selection
Choose an inductor with low DC resistance (in the
neighborhood of 100m ? ) to minimize losses. A typical
inductance value for L is 10μH; however, values from
3.3μH to 100μH can also be used. Higher inductor val-
ues reduce the MAX1698’s switching frequency. The
typical operating frequency is given by:
The MAX1698/MAX1698As' high-switching frequency
demands a high-speed rectifier. Schottky diodes are
recommended for most applications, due to their fast
recovery time and low forward-voltage drop. Ensure
that the diode ’s average and peak current ratings
exceed the average output current and peak inductor
current, respectively. In addition, the diode’s reverse
breakdown voltage must exceed V OUT . For output volt-
ages exceeding 40V, high-speed silicon rectifiers may
be required for their higher breakdown voltages.
Zener Diode
For applications requiring open-circuit protection if one
of the LEDs in the primary chain opens, add a zener
diode as shown in Figure 2. The zener diode protects
the MOSFET and output capacitor if the current feed-
back signal is lost. The zener voltage should exceed
the maximum forward voltage of the LED network by at
least 2V.
f =
0.67 ? V BATT
L
Applications Information
The MAX1698/MAX1698A limit peak inductor current to
1.5A, but also contains a control loop that reduces
inductor current as a function of output power. For a
given output power, the required inductor peak current
rating is approximately set by:
I L(PEAK) = 1.0 · P OUT
where P OUT is the output power to all LED banks in
watts and I L(PEAK) is in amperes.
Capacitor Selection
The exact value of output capacitance is not critical.
Typical values for the output capacitor are 0.1μF to
10μF. Larger values help reduce output ripple at the
expense of size and higher cost.
The requirements of the input capacitor depend on the
type of the input voltage source. However, in many
applications, the same capacitor type and value are
used for both the input and output capacitors.
PCB Layout
Due to fast switching waveforms and high-current
paths, careful PCB layout is required. Protoboards and
wire-wrap boards should not be used for evaluation. An
EV kit (MAX1698EVKIT) is available to aid most
designs.
When laying out a board, minimize trace lengths to CS,
the inductor, diode, input capacitor, and output capaci-
tor. Keep traces short, direct, and wide. Keep noisy
traces, such as the inductor’s traces, away from FB.
V CC ’s bypass capacitor should be placed as close to
the IC as possible.
Refer to the MAX1698 EV kit for an example of proper
layout.
Chip Information
TRANSISTOR COUNT: 2180
_______________________________________________________________________________________
7
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1698EUB+T | IC LED DRVR WT/CLR BCKLGT 10MSOP |
| TPSD337M006Y0045 | CAP TANT 330UF 6.3V 20% 2917 |
| ABB66DHHN-S621 | CONN EDGECARD 132PS .050 DIP SLD |
| ACB66DHHD-S621 | CONN EDGECARD 132POS .050 SLD |
| ABB66DHHD-S621 | CONN EDGECARD 132PS .050 DIP SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1698EUB | 功能描述:LED照明驱动器 Step-Up Current Regulator for LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX1698EUB+ | 功能描述:LED照明驱动器 Step-Up Current Regulator for LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX1698EUB+ | 制造商:Maxim Integrated Products 功能描述:IC DRIVER LED SMD 1698 MSOP10 制造商:Maxim Integrated Products 功能描述:IC, DRIVER, LED, SMD, 1698, MSOP10 |
| MAX1698EUB+T | 功能描述:LED照明驱动器 Step-Up Current Regulator for LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX1698EUB-T | 功能描述:LED照明驱动器 Step-Up Current Regulator for LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
发布紧急采购，3分钟左右您将得到回复。