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参数资料
| 型号： | A8514KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 22/42页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT 4X80MA 16-ETSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，SEPIC，升压（升压） |
| 输出数： | 4 |
| 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： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 20-TSSOP-EP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
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A8514
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
Input overcurrent protection and disconnect switch
The primary function of the input disconnect switch is to protect
the system and the device from catastrophic input currents during
a fault condition. The external circuit implementing the discon-
nect is shown in figure 29. If the input disconnect switch is not
C1
FAULT
I IN
(1) Initial fault
detected
(3) I IN limited to 3 A
used, the VSENSE pin must be tied to VIN and the GATE pin
must be left open.
When selecting the external PMOS, check for the following
parameters:
C2
(2) Disconnect switch
goes into a linear mode
? Drain-source breakdown voltage V (BR)DSS > –40 V
? Gate threshold voltage (make sure it is fully conducting at
C3
GATE
(4) After 12.5 ms,
disconnect switch
shuts down
PWM/EN
V GS = –4 V, and cut-off at –1 V)
? R DS(on) : Make sure the on-resistance is rated at V GS = –4.5 V or
similar, not at –10 V; derate it for higher temperature
The input disconnect switch has two modes of operation:
? 1X mode When the input current is between one and two times
the preset current limit value, the disconnect switch enters a con-
stant-current mode for a maximum duration of 10,000 cycles or
5 ms at 2 MHz. During this time, the Fault flag is set immediately
C4
t
Figure 30. Showing typical wave forms for a 3-A, 1X current limit under a
fault condition; shows f SW = 800 kHz, ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ (ch1, 5 V/div.), I IN (ch2, 2 A/
div.), GATE (ch3, 5 V/div.), and PWM/EN (ch4, 5 V/div.), time = 5 ms/div.
FAULT
and the disconnect switch goes into a linear mode of operation,
in which the input current will be limited to a value approximate
C1
Fault flag set at
1X trip point
to the 1X current trip point level (figure 30). If the fault corrects
itself before the expiration of the timer, the Fault flag will be
removed and normal operation will resume.
C2
GATE
A8514 shuts down at
2X trip point
The user can also during this time decide whether to shut down
the A8514. To immediately shut down the device, pull the FSET/
SYNC pin low for more than 7 μ s. After the FSET/SYNC pin has
C3
I IN
been low for a period longer than 7 μ s, the IC will stop switching,
the input disconnect switch will open, and the LEDx pins will
C4
PWM/EN
stop sinking current. The A8514 can be powered-down into low
power mode. To do so, disable the IC by keeping the PWM/EN
pin low for a period of 32,750 clock cycles. To keep the discon-
nect switch stable while the disconnect switch is in 1X mode, use
a 22 nF capacitor for C C and a 20 Ω resistor for R C .
t
Figure 31. 2X mode, secondary overcurrent fault condition. I IN is the input
current through the switch. The Fault flag is set at the 1X current limit, and
when the 2X current limit is reached the A8514 disables the gate of the
disconnect switch (GATE); shows ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ (ch1, 5 V/div.), GATE (ch2,
10 V/div.), I IN (ch3, 2 A/div.), and PWM/EN (ch4, 5 V/div.), time = 5 μ s/div.
V IN
R SC
R C
C C
Q1
To L1
V IN
To L1
R ADJ
GATE
GATE
VSENSE
VIN
A8514
VSENSE
VIN
A8514
Figure 29. Typical circuit (left) with the input disconnect feature implemented, and (right) without the input disconnect feature.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
22
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