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| 型号： | A8515GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 17/34页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT/RGB BKLGT 16TSSOP |
| 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： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 600kHz ~ 2.5MHz |
| 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 ~ 105°C |
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A8515
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
appropriate value. Another consideration that also is important is
is controlled by the following formula:
the limitation of the user APWM signal duty cycle. In some cases
it might be preferable to set the maximum ISET current to be
I SET =
V ISET – V DAC
R ISET – V DAC
(3)
V ISET V DAC – V ISET
25% to 50% higher, thus allowing theAPWM signal to have duty
cycles that are between 25% and 50%.
Although the APWM dimming function has a wide frequency
range, if this function is used strictly as an analog dimming
function it is recommended to use frequency ranges between
50 and 500 kHz for best accuracy. The frequency range must be
considered only if the user is not using this function as a closed
loop trim function. Another limitation is that the propagation
delay between this APWM signal and I OUT takes several milli-
seconds to change the actual LED current. This effect is shown in
figures 16 through 18.
Analog dimming
The A8515 can also be dimmed by using an external DAC or
another voltage source applied either directly to the ground side
of the R ISET resistor or through an external resistor to the ISET
pin (see figure 19).
? For a single resistor (upper panel of figure 19), the ISET current
Where V ISET is the ISET pin voltage and V DAC is the DAC out-
put voltage.
When the DAC voltage is equal to V ISET , the internal reference,
there is no current through R ISET . When the DAC voltage starts
to decrease, the ISET current starts to increase, thus increasing
the LED current. When the DAC voltage is 0 V, the LED current
will be at its maximum.
? For a dual-resistor configuration (lower panel of figure 19), the
ISET current is controlled by the following formula:
I SET = – (4)
R ISET R 1
The advantage of this circuit is that the DAC voltage can be
higher or lower, thus adjusting the LED current to a higher or
lower value of the preset LED current set by the R ISET resistor:
? VDAC = 1.003 V; the output is strictly controlled by R ISET
? VDAC > 1.003 V; the LED current is reduced
? VDAC < 1.003 V; the LED current is increased
C1
I OUT
DAC
VDAC
GND
R ISET
A8515
ISET
GND
C2
APWM
DAC
R1
A8515
VDAC
ISET
C3
EN/PWM
t
GND
R ISET
GND
Figure 18. Transition of output current level when a 50% duty cycle signal
is applied to the APWM pin, in conjunction with a 50% duty cycle PWM
dimming being applied to the EN/PWM pin; shows I OUT (ch1, 100 mA/div.),
APWM (ch2, 5 V/div.), and EN/PWM (ch3, 5 V/div.), 1 ms/div.
Figure 19. Simplified diagrams of voltage control of I LED : typical
applications using a DAC to control I LED using a single resistor (upper),
and dual resistors (lower).
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
17
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