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| 型号： | ADD5203ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 28LFCSP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 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： | 白色 LED |
| 频率： | 350kHz ~ 1MHz |
| 电源电压： | 6 V ~ 21 V |
| 输出电压： | 45V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 28-LFCSP-WQ（4x4） |
| 包装： | 标准包装 |
| 工作温度： | -25°C ~ 85°C |
| 其它名称： | ADD5203ACPZ-RLDKR |
ADD5203
manufacturers derate the current capability of the diode as a
function of the duty cycle. Verify that the output diode is rated
to handle the average output load current with the minimum
duty cycle.
The minimum duty cycle of the ADD5203 is
LAYOUT GUIDELINES
When designing a high frequency, switching, regulated power
supply, layout is very important. Using a good layout can solve
many problems associated with these types of supplies. The
main problems are loss of regulation at high output current
D MIN =
V OUT ? V IN_MAX
V OUT
and/or large input-to-output voltage differentials, excessive
noise on the output and switch waveforms, and instability.
Using the following guidelines can help minimize these
V HR
ESR × C OUT
where V IN_MAX is the maximum input voltage.
For example, D MIN is 0.5 when V OUT is 30 V and V IN_MAX is 15 V.
Schottky diode manufacturers include ON Semiconductor,
Diodes Incorporated, Central Semiconductor Corp., and Sanyo.
Loop Compensation
The external inductor, output capacitor, and the compensation
resistor and capacitor determine the loop stability. The inductor
and output capacitor are chosen based on performance, size, and
cost. The compensation resistor (R C ) and compensation capacitor
(C C ) at the COMP pin are selected to optimize control loop
stability.
For most applications, the compensation resistor should be in
the range of 500 Ω to 30 kΩ , and the compensation capacitor
should be in the range of 100 pF to 330 nF.
REF
G MEA
R C
C2
C C
Figure 24. Compensation Components
A step-up converter produces an undesirable right-half plane
zero in the regulation feedback loop. Capacitor C2 is chosen
to cancel the zero introduced by output capacitance ESR.
Solving for C2
C2 =
R C
For low ESR output capacitance, such as with a ceramic
capacitor, C2 is optional.
problems.
Make all power (high current) traces as short, direct, and thick
as possible. It is good practice on a standard printed circuit
board (PCB) to make the traces an absolute minimum of 15 mil
(0.381 mm) per ampere. Place the inductor, output capacitors,
and output diode as close to each other as possible. This helps
reduce the EMI radiated by the power traces that are due to the
high switching currents through them. This also reduces lead
inductance and resistance, which, in turn, reduce noise spikes,
ringing, and resistive losses that produce voltage errors. The
grounds of the IC, input capacitors, output capacitors, and
output diode (if applicable), should be connected close together,
directly to a ground plane. It is also a good idea to have a ground
plane on both sides of the PCB. This reduces noise by reducing
ground loop errors and by absorbing more of the EMI radiated
by the inductor.
For multilayer boards of more than two layers, a ground plane
can be used to separate the power plane (power traces and com-
ponents) and the signal plane (feedback, compensation, and
components) for improved performance. On multilayer boards,
the use of vias is required to connect traces and different planes.
If a trace needs to conduct a significant amount of current from
one plane to the other, it is good practice to use one standard
via per 200 mA of current. Arrange the components so that the
switching current loops curl in the same direction.
Due to how switching regulators operate, there are two power
states: one state when the switch is on, and one when the switch
is off. During each state, there is a current loop made by the
power components currently conducting. Place the power
components so that the current loop is conducting in the same
direction during each of the two states. This prevents magnetic
field reversal caused by the traces between the two half cycles
and reduces radiated EMI.
Rev. 0 | Page 18 of 24
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相关代理商/技术参数 |
参数描述 |
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| ADD5205 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Four-String White LED Driver |
| ADD5205ACPZ-RL | 功能描述:IC LED DVR WHITE BCKLGT 12LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），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:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| ADD5207 | 制造商:AD 制造商全称:Analog Devices 功能描述:Four-String, White LED Driver |
| ADD52070001CPZR | 功能描述:IC LED DRIVER REGULATOR DIM 制造商:analog devices inc. 系列:* 零件状态:上次购买时间 标准包装:1 |
| ADD5207ACPZ | 制造商:Analog Devices 功能描述:DRIVER LED 1MHZ 36V 14LFCSP 制造商:Analog Devices 功能描述:DRIVER, LED, 1MHZ, 36V, 14LFCSP 制造商:Analog Devices 功能描述:DRIVER, LED, 1MHZ, 36V, 14LFCSP, Topology:Boost (Step Up), No. of Outputs:1, Out 制造商:Analog Devices 功能描述:DRIVER, LED, 1MHZ, 36V, 14LFCSP, Topology:Boost (Step Up), No. of Outputs:1, Output Voltage:36V, Driver Case Style:LFCSP, Input Voltage Min:6V, Input Voltage Max:21V, Dimming Control Type:PWM, Switching Frequency:1MHz, Operating , RoHS Compliant: Yes |
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