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参数资料
| 型号： | A6267KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 15/17页 |
| 文件大小： | 0K |
| 描述： | IC LED CTLR AUTO HI CURR 16TSSOP |
| 标准包装： | 8,000 |
| 恒定电流： | 是 |
| 拓扑： | 低端，PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 车载，背光 |
| 频率： | 100kHz ~ 700kHz |
| 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： | 带卷 (TR) |
| 工作温度： | -40°C ~ 150°C |
A6267
Automotive High Current LED Controller
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-
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.
VBAT
To VIN
Reverse Supply Protection Protection for the A6267 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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