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参数资料
| 型号： | A8513KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 12/25页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR AUTO BCKLGHT 16TSSOP |
| 特色产品： | Allegro A8513 LED Driver |
| 标准包装： | 1 |
| 拓扑： | PWM，SEPIC，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1.8MHz ~ 2.2MHz |
| 电源电压： | 4.5 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： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 620-1440-6 |
A8513
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
Analog dimming
The A8513 can also be dimmed by using an external DAC or
other voltage source applied either directly to the ground side of
the R ISET resistor or through an external resistive divider to the
ISET pin. The limitation of this form of dimming is that the inter-
nal I SET error amplifier is designed to work from 40 to 160 μ A,
thus limiting the dimming ratios that can be achieved.
Figure 8, top panel is a typical application using a DAC to control
the LED current using a single resistor connected to the ISET pin.
The I SET current is controlled by the following formula:
lower value of the preset LED current set by the R ISET resistor:
? V DAC = 1.003 V; the output is strictly controlled by R ISET
? V DAC > 1.003 V; the LED current is reduced
? V DAC < 1.003 V; the LED current is increased
Output Overvoltage Protection (OVP) and Output
Undervoltage Protection (UVP)
The A8513 has output overvoltage protection (OVP), output
undervoltage protection and secondary overvoltage protection
(open diode).
I SET
=
V ISET – V DAC
R ISET
(3)
Overvoltage Protection The OVP pin has a threshold, V OVPHI(th) ,
of 1.218 V. A resistive divider can be used to set the V OUT over-
voltage protection threshold up to 45 V (see figure 9). There is
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
no restriction on the value of the resistor chosen, but it is recom-
mended that the divider current be kept between 10 and 60 μ A.
This will minimize the effect of sense current on the accuracy of
OVP, and minimize output voltage bleed-off during PWM dim-
ming.
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 8), the
ISET current is controlled by the following formula:
Formulas for calculating the OVP resistor voltage divider are
shown below.
R OVP1 = (V OVP – 1.218 V) / I SET
(5)
I SET =
V ISET
R ISET
–
V DAC – V ISET
R 1
(4)
R OVP2 = 1.218 V / I SET
The OVP function is not inherently a latched fault. If the OVP
(6)
The advantage of this circuit is that the DAC voltage can be
higher or lower, thus adjusting the LED current to a higher or
condition occurs during a load dump, the IC will stop switching
but not shut down.
VOUT
DAC
VDAC
GND
R ISET
A8513
ISET
GND
A8513
OVP
R OVP1
R OVP2
1.218 V
DAC
VDAC
R1
A8513
ISET
GND
R ISET
GND
100 mV
Figure 8. Simplified diagram of voltage LED current control (upper) single
resistor, and (lower) dual resistors.
Figure 9. Simplified diagram of the OVP pin functions.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
12
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相关代理商/技术参数 |
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|---|---|
| A8513KLYTR-1-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
| A8513KLYTR-2-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
| A8513KLYTR-3-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
| A8513KLYTR-T | 功能描述:IC LED DRVR AUTO BCKLGHT 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 特色产品:LM3445 TRIAC Dimmable LED Driver 标准包装:55 系列:PowerWise® 恒定电流:是 恒定电压:- 拓扑:PWM，降压（降压） 输出数:1 内部驱动器:无 类型 - 主要:- 类型 - 次要:高亮度 LED（HBLED） 频率:30kHz ~ 1MHz 电源电压:8 V ~ 12 V 输出电压:- 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:管件 工作温度:-40°C ~ 125°C 产品目录页面:1285 (CN2011-ZH PDF) 其它名称:LM3445M |
| A8514 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A8514 is a multi-output white LED driver for small-size LCD backlighting. |
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