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| 型号： | A6265KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 15/17页 |
| 文件大小： | 0K |
| 描述： | IC LED CTLR HI CURRENT 16-TSSOP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，SEPIC，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 车载 |
| 频率： | 可调节/可选择 |
| 电源电压： | 6.5 V ~ 50 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 150°C |
| 其它名称： | 620-1394-6 |
A6265
Automotive High Current LED Controller
Output Capacitor There are several points to consider when
selecting the output capacitor.
Unlike some switch-mode regulators, the value of the output
capacitor in this case is not critical for output stability. The
capacitor value is only limited by the required maximum ripple
voltage.
Due to the switching topology used, the ripple current for this
circuit is high because the output capacitor provides the LED
current when the switch is active. The capacitor is then recharged
each time the inductor passes energy to the output. The ripple
current on the output capacitor will be equal to the peak inductor
current.
Normally this large ripple current, in conjunction with the
requirement for a larger capacitance value for stability, would
dictate the use of large electrolytic capacitors. However in this
case stability is not a consideration, and the capacitor value can
be low, allowing the use of ceramic capacitors.
To minimize self-heating effects and voltage ripple, the equiva-
lent series resistance (ESR), and the equivalent series inductance
(ESL) should be kept as low as possible. This can be achieved by
multilayer ceramic chip (MLCC) capacitors. To reduce perfor-
VBAT
To VIN
mance variation over temperature, low drift types such as X7R
and X5R should be used.
The value of the output capacitor will typically be about 10 μ F
and it should be rated above the maximum voltage defined by the
series output LEDs.
Reverse Supply Protection Protection for the A6265 is
provided by an external low current diode between the supply
and the VIN pin, as shown in the Functional Block Diagrams
section. The isolation MOSFET shown in figure 3 is only able to
provide isolation when the supply polarity is correct. However,
with an additional P-channel MOSFET, it is also possible to
provide reverse battery protection to the switching elements and
the LEDs. The additional FET should be connected, as shown in
figure 4, with the drain to the supply and the source to the source
connection of the original isolation MOSFET.
In the complete circuit, consideration should be given to limiting
the maximum gate-source voltage of the FET. If the supply volt-
age is likely to exceed 20 V, then either: a Zener clamp must be
added in parallel with the gate-source resistor to prevent damage
to the FET, or a second resistor added as shown in figure 3.
To FF1
Figure 4. Example of a supply isolation MOSFET
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A6266 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A6266 is a boost converter controller, providing a programmable constant current output for driving high power LEDs in series. |
| A6266KLPTR-T | 功能描述:IC LED CTLR AUTO HI CURR 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 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 |
| A6267 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A6267 is a DC-to-DC converter controller, providing a programmable constant current output for driving high power LEDs in series. |
| A6267KLPTR-T | 功能描述:IC LED CTLR AUTO HI CURR 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 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 |
| A6268 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A6268 is a DC-to-DC converter controller, providing a programmable constant current output for driving high power LEDs in series. |
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