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参数资料
| 型号： | A6262KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC LED ARRAY DRIVER AUTO 16TSSOP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO），PWM |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，通用 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 电源电压： | 6 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： | 剪切带 (CT) |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 620-1362-6 |
A6262
always be greater than this value and the minimum specified sup-
Automotive LED Array Driver
Application Examples
ply voltage, that is:
V IN > V DO + V LED , and
Operation with High-Side PWM Supply In some filament
bulb replacement applications the supply may be provided by a
V IN > V IN (min) (10)
As an example, consider the configuration used in figures 6 and
7 above, namely 4 strings of 3 red LEDs, each string running at
50 mA, with each LED forward voltage at 2.3 V. The minimum
supply voltage will be approximately:
V IN (min) = 0.55 + (3 × 2.3) = 7.45 V
Maximum Supply Limit: Thermal Limitation As described
above, when the thermal monitor reaches the activation tempera-
ture, T JM (due to increased power dissipation as the supply volt-
age rises), the thermal foldback feature causes the output current
to decrease. The maximum supply voltage is therefore defined as
the voltage above which the LED current drops below the accept-
able minimum.
This can be estimated by determining the maximum power that
can be dissipated before the internal (junction) temperature of the
A6262 reaches T JM .
Note that, if the thermal monitor circuit is disabled (by connect-
ing the THTH pin to GND), then the maximum supply limit will
be the specified maximum continuous operating temperature,
150°C.
The maximum power dissipation is therefore defined as:
PWM-driven high-side switch. The A6262 can be used in this
application by simply connecting EN to VIN.
The toggle action of the SW input will be reset to off at each
power-up. In addition, in all cases when EN is high, the EN input
will override the SW toggle status and enable the outputs. At the
high-to-low transition of EN, the SW toggle will always be reset
to the off state.
When power is applied, there will be a short startup delay, t ON ,
before the current starts to rise. The rise time of the current will
be limited by the internal current slew rate control.
Figures 9a to 9c show application circuit options, including a
higher voltage supply, and combinations of outputs tied together
and disabled.
Operation with both EN and SW In some applications it
may be required to utilize the functionality of both the EN input
and the SW input. For example in dome lighting, where a manual
switch may be used to turn the light on and the lighting control
unit may dim the light to off (see figure 10). In these cases it is
important to understand the interaction of the two control inputs.
P D (max) =
? T (max)
R θ JA
(11)
? In all cases, when EN is high the EN input will override the SW
toggle status and enable the outputs.
where Δ T(max) is difference between the thermal monitor activa-
tion temperature, T JM , of the A6262 and the maximum ambient
temperature, T A (max), and R θ JA is the thermal resistance from the
internal junctions in the silicon to the ambient environment.
If minimum LED current is not a critical factor, then the maxi-
mum voltage is simply the absolute maximum specified in the
parameter tables above.
? When EN is low the SW input can be used to toggle the outputs
on and off.
? The only time there is any interaction between the EN input and
the SW toggle is the high-to-low transition of EN, where the
SW toggle will always be reset to the off state.
? The SW toggle will also be reset to the off state at power-up.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
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| A6263KLJTR-T | 制造商:Allegro MicroSystems LLC 功能描述:IC LED ARRAY DRIVER AUTO 8SOIC 制造商:Allegro MicroSystems LLC 功能描述:FOUR CHANNEL LINEAR LED DRIVER |
| A6264 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A6264 is a linear, programmable current regulator providing up to 100 mA from each of four outputs to drive arrays of high brightness LEDs. |
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