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| 型号： | A8502KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 13/35页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHITE MULTI 16-TSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 2 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 580kHz ~ 2MHz |
| 电源电压： | 5 V ~ 40 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 ~ 125°C |
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A8502
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
If a LEDx pin is shorted to ground the A8502 will not proceed
with soft start until the short is removed from the LEDx pin. This
prevents the A8502 from powering-up and putting an uncon-
trolled amount of current through the LEDs.
Inrush current caused by
Soft start function
During soft start the LEDx pins are set to sink (I LEDSS ) and the
boost switch current is reduced to the I SWSS(LIM) level to limit
the inrush current generated by charging the output capacitors.
When the converter senses that there is enough voltage on the
LEDx pins the converter proceeds to increase the LED current to
the preset regulation current and the boost switch current limit is
switched to the I SW(LIM) level to allow the A8502 to deliver the
necessary output power to the LEDs. This is shown in figure 6.
Frequency selection
The switching frequency on the boost regulator is set by the resis-
C1
C2
C3
C4
enabling the disconnect
switch (when used)
I OUT
I IN
V OUT
PWM/EN
Operation during
I SWSS(lim)
Normal operation
I SW(lim)
tor connected to the FSET/SYNC pin. The switching frequency
can be can be anywhere from 580 kHz to 2.3 MHz. Figure 7
shows the typical switching frequencies, in MHz, for given resis-
t
Figure 6. Startup diagram showing the input current, output voltage, and
output current; shows I OUT (ch1, 200 mA/div.), I IN (ch2, 1 A/div.), V OUT
(ch3, 20 V/div.), and PWM/EN (ch4, 5 V/div.), time = 1 ms/div.
tor values, in k Ω .
In case during operation a fault occurs that will increase the
switching frequency, the FSET/SYNC pin is clamped to a
maximum switching frequency of no more than 3.5 MHz. If the
FSET/SYNC pin is shorted to GND the part will shut down. For
more details see the Fault Mode table later in this datasheet.
2.1
1.9
A8502
A8502
1.7
1.5
1.3
1.1
GND
LED1
LED2
GND
LED1
LED2
0.9
0.7
0.5
1.54 k Ω
10.0
12.5
15.0
17.5
20.0
22.5
25.0
30.0
32.5
35.0
Resistance for R SET (k Ω )
Figure 5. Channel select setup: (left) using only channel LED1,
(right) using both channels.
Figure 7. Typical Switching Frequency versus value of R FSET resistor.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
13
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