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| 型号： | A8515GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/34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
The basic requirement of the sync signal is 150 ns minimum on-
time and 150 ns minimum off time, as indicated by the specifica-
tions for t PWSYNCON and t PWSYNCOFF . Figure 9 shows the timing
for a synchronization clock into the A8515 at 2.2 MHz. Thus any
pulse with a duty cycle of 33% to 66% at 2.2 MHz can be used to
synchronize the IC. The rise and fall edges should be about 10 ns.
The SYNC pulse duty cycle ranges for selected switching fre-
quencies are:
LED current setting and LED dimming
The maximum LED current can be up to 120 mA per channel,
and is set through the ISET pin. To set the I LED current, connect
a resistor, R ISET , between this pin and GND, according to the fol-
lowing formula:
R ISET = 980 / I LED (2)
where I LED is in A and R ISET is in Ω . This sets the maximum cur-
rent through the LEDs, referred to as the 100% current . Standard
R ISET values, at gain equals 980, are as follows:
SYNC Pulse Frequency
(MHz)
2.2
2
1
0.800
0.600
Duty Cycle Range
(%)
33 to 66
30 to 70
15 to 85
12 to 88
9 to 91
Standard Closest R ISET
Resistor Value
(k Ω )
8.25
9.76
12.1
15.0
LED current per LED, I LED
(mA)
120
100
80
65
If during operation a sync clock is lost, the IC will revert to the
preset switching frequency that is set by the resistor R FSET . Dur-
ing this period the IC will stop switching for a maximum period
of about 7 μ s to allow the sync detection circuitry to switch
over to the externally preset switching frequency. If the clock is
held low for more than 7 μ s, the A8515 will shut down. In this
shutdown mode the IC will stop switching, the input disconnect
switch is open, and the LEDs will stop sinking current. To shut-
down the IC into low power mode, the user needs to disable the
IC using the EN/PWM pin, by keeping the pin low for a period
of 65 ms. If the FSET pin is released at any time after 5 μ s, the
A8515 will proceed to soft start.
PWM dimming
The LED current can be reduced from the 100% current level
by PWM dimming using the EN/PWM pin. When the EN/PWM
pin is pulled high, the A8515 turns on and all enabled LEDs sink
100% current. When EN/PWM is pulled low, the boost converter
and LED sinks are turned off. The compensation (COMP) pin is
floated, and critical internal circuits are kept active. The typical
PWM dimming frequencies fall between 200 Hz and 1 kHz. Fig-
ures 12A to 12D provide examples of PWM switching behavior.
Another important feature of the A8515 is the PWM signal to
LED current delay. This delay is typically less than 500 ns, which
allows greater accuracy at low PWM dimming duty cycles, as
shown in figure 11.
t PWSYNCON
154 ns
10
8
150 ns
150 ns
t PWSYNCOFF
6
4
2
0
Worst-case
Typical
T = 454 ns
0.1
1 10
PWM Duty Cycle, D (%)
100
Figure 10. SYNC pulse on and off time requirements.
Figure 11. Percentage Error of the LED current versus PWM duty cycle
(at 200 Hz PWM frequency).
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
14
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