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参数资料
| 型号： | A8500EECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHT/RGB BCKLGT 26QFN |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 200kHz ~ 2MHz |
| 电源电压： | 4.2 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 26-WFQFN 裸露焊盘 |
| 供应商设备封装： | 26-QFN/MLP-EP（4x4） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1142 (CN2011-ZH PDF) |
| 其它名称： | 620-1204-6 |
A8500
At startup, the output capacitor is discharged and the IC enters
Flexible WLED/RGB Backlight Driver
for Medium Size LCDs
cycle, is less than 3%. In this mode, the A8500 goes through a
soft start. The boost current is limited to 1 A, and all active LED x
pins sink 1 / 16 of the set 100% current until all of the enabled
LED x pins reach 0.5 V. After the IC comes out of soft start, the
boost current and the LED x pin currents are set to 100% current.
The output capacitor charges to the voltage level required to sup-
ply full LED x current within a few cycles. The IC is shut down
immediately when PWM goes low.
Analog Dimming with an External PWM Signal on the APWM
Pin. When the APWM pin is pulled high, with the EN and PWM
pins low, the A8500 turns on in this mode. The first pulse after
shutdown should be greater than t HI(init) . The logic level PWM
signal applied to the APWM pin multiplies I SET by the duty cycle
to set the reference current level for the LED pins. The typical
range for the APWM signal frequency is 20 kHz to 2 MHz. The
output current ripple at 20 kHz, 50% duty cycle, is less than 5%
of the set value. The LED current accuaracy at 2 MHz, 50% duty
soft start routine similar to serial dimming.
Device Internal Protection
Overcurrent Protection (OCP). The A8500 has a pulse-by-pulse
current limit of 2 A on the boost switch. This current limit is
independent of duty cycle.
Thermal Shutdown Protection (TSD). The IC shuts down when
junction temperature exceeds 165°C and restarts when the junc-
tion temperature falls by 40°C.
Overvoltage Protection (OVP). The A8500 has overvoltage
protection to protect the IC against output overvoltage. The over-
voltage level can be set, from 30 to 45 V typical, with an external
resistor, ROVP, as shown in figure 10. When the current though
the OVP pin exceeds 54.9 μ A, the OVP comparator goes high.
When the OVP pin current falls below 47.8 μ A, OVP is reset.
180
V IN
D1
V OUT
160
140
120
100
80
60
f APWM (kHz)
20
100
500
OVP
Disable
SW SW
28.8 V
–
22 k Ω
+
1.23 V
ROVP
OVP
DZ
A
COUT
40
20
0
4.4 k Ω
0
20
40 60
80
100
Duty Cycle (%)
Figure 9. APWM pin dimming linearity.
Figure 10. Overvoltage protection circuit. Three alternative
configurations at (A) are available, as follows:
External Component
ROVP only
DZ only
both ROVP and DZ
OVP Rating
up to 45 V
up to 47 V
redundancy
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
11
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8501 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:2 MHz, 4 Channel100 mA WLED/RGB Driver |
| A85014-000 | 制造商:TE Connectivity 功能描述:POLYOLEFINS ETC - Bulk 制造商:TE Connectivity 功能描述:MIL-LT-1/2-6-FSP-CS7223 |
| A8501ELPTR-T | 功能描述:IC LED DRVR WT/RGB BKLGT 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| A8501KLPTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| A8502 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency |
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