- 您现在的位置：买卖IC网 > Datasheet目录307 > A8514KLPTR-T (Allegro Microsystems Inc)IC LED DVR WHT 4X80MA 16-ETSSOP Datasheet资料下载
参数资料
| 型号： | A8514KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 41/42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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页当前第41页第42页
A8514
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
Measuring the Feedback Loop Gain and Phase Margin
It is always necessary to measure the feedback loop gain and
phase margin of a power converter to make sure the converter
runs stably and responds quickly to line or load transients. In
addition, to calculate the feedback-loop component values, it
is necessary first to calculate or preferably to measure only the
power-stage transfer function at the required cross over fre-
quency. Below, one method for measuring the power-stage and
the closed-loop whole system transfer functions is presented.
Power Stage Transfer Function Measurement
The power stage or control to output transfer function can be mea-
sured using any gain/phase analyzer. Figure A-5 shows a block
diagram for the whole closed-loop system. To measure the power-
stage transfer function, implement the following steps:
1. First, temporarily, use a large value capacitor for C Z , say
4.7 μ F, and a small value resistor for R Z , say 100 Ω , to roll-off the
control loop at very low frequency.
2. On the PCB cut the trace between VOUT and the LED strings.
3. Connect a 10 Ω resistor from VOUT to the LED strings.
4. Connect the sweeping signal, V S , leads from the spectrum
analyzer line (red) to VOUT and the neutral (black) to the LED
string, across the 10 Ω resistor.
5. Hook the voltage probe V2 (red) to VOUT (B1) and the ground
lead to PCB GND.
6. Hook the voltage probe V1 (blue) to V C , so the gain would be
G P (f) = B1 / A2.
7. Run the sweep.
8. When the sweep is completed, to read the power stage gain
G P (f C ) at the selected frequency, f C , place the analyzer screen
cursor at that frequency.
PWM
Q1
B1
VOUT
Driver
R1
10 ohm
+
–
Vs
COUT
A2
Vc
Rz
Cz
Cp
A1
AC Sweeping Signal
LED Strings
+
–
Vreg
I-string
Figure A-5. Simplified block diagram for the closed-loop whole system to show how to measure
the gain of the power stage or closed-loop system gain and phase margin
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A-6
相关PDF资料 |
PDF描述 |
|---|---|
| A8515GLPTR-T | IC LED DVR WHT/RGB BKLGT 16TSSOP |
| A8516ELPTR-T | IC LED DVR BACKLIGHT MON 24TSSOP |
| A8740EEETR-T | IC PHOTOFLASH CAP CHARGER 8DFN |
| AC162049-2 | MOD PROGR UNIV MPLAB ICD2 ICD3 |
| AC162049 | MODULE SOCKET FOR ICD2 DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A8515 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A8515 is a multi-output white LED (WLED) driver for LCD backlighting in consumer and industrial displays. |
| A8515GLPTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 16TSSOP 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 |
| A8516 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A8516 is a multi-output WLED/RGB driver for backlighting LCD monitors and televisions. |
| A85169-000 | 制造商:TE Connectivity 功能描述:MPCB-20.0-0-E563 - Cable Rools/Shrink Tubing |
| A8516ELBTR-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A8516 is a multi-output WLED/RGB driver for backlighting LCD monitors and televisions. |
发布紧急采购，3分钟左右您将得到回复。