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| 型号： | A6210GEUTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER HIGH BRIGHT 16-QFN |
| 特色产品： | A6210 Buck-Regulating LED Driver |
| 标准包装： | 1 |
| 拓扑： | PWM，降压（降压），切换式电容器（充电泵） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 2MHz |
| 电源电压： | 9 V ~ 46 V |
| 输出电压： | 46V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WSQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（4x4） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 105°C |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1281-6 |
A6210
3 A, 2 MHz Buck-Regulating LED Driver
off-time of 350 ns. A minimum off-time is required to ensure the
bootstrap supply operates correctly. It can be shown that:
a margin of at least 20% be allowed. In this example, the inductor
current rating, I L , should be:
f SW =
1– D
t off (min)
,
(8)
I L ≥ 1.2 × (500 × 10 –3 + 60 × 10 –3 / 2) = 636 mA .
The valley control current is simply the average LED current
where t off is 350 ns maximum.
minus half the ripple current. Therefore:
= 350 × 10 –9 = 1.4 MHz
I VALLEY = I av –
Therefore:
1 – 0.51
f SW
The t on resistor (R1) value can be found:
.
I RIPPLE
2
= 500 × 10 –3 –
60 × 10 –3
2
= 470 mA
.
(11)
= = 176 × 10 3 .
R 3 =
= = 0.36 .
V LED × 2.051 × 10 10
R 1 =
f SW
12 × 2.051 × 10 10
1.4 × 10 6
Choose R1 = 180 k Ω .
(9)
The sense resistor (R3) value can be found:
V SENSE
I VALLEY
183 × 10 –3
470 × 10 –3
(12)
The inductor (L1) can now be found using the target LED ripple
current of 60 mA:
Choose R3 = 390 m Ω .
The ripple voltage developed across the sense resistor (R2) is
L 1 =
=
( V IN – V LED ) × D
I RIPPLE × f SW
(24 – 12) × 0.51
60 × 10 –3 × 1.4 × 10 6
= 72 × 10 –6 .
(10)
60 mA × 390 m Ω = 23 mV, which is greater than the minimum
required value of 20 mV.
Measured switching waveforms
Choose L1 = 68 μ H.
The inductor current rating should exceed the average current
plus half of the ripple current. In addition, it is recommended that
From figure 3, it can be seen that the average current through
the LED string is 484 mA. This represents an error of 3.2% with
respect to the target current of 500 mA.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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