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参数资料
| 型号： | ADD5205ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHITE BCKLGT 12LFCSP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 2.8 V ~ 18 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 12-LFCSP-WQ（3x3） |
| 包装： | 标准包装 |
| 工作温度： | -25°C ~ 85°C |
| 其它名称： | ADD5205ACPZ-RLDKR |
Data Sheet
EXTERNAL COMPONENT SELECTION GUIDE
Inductor Selection
Table 6 shows a list of recommend inductors.
Table 6. Recommended Inductors
ADD5205
The inductor is an integral part of the step-up converter. It stores
energy during the switch-on time and transfers that energy to
the output through the output diode during the switch-off time.
An inductor in the 3.3 μH to 6.8 μH range is recommended. In
general, lower inductance values result in higher saturation
Coilcraft Part No.
XFL4020-332ML
LPS4012-472ML
LPS4018-472ML
LPS4018-682ML
L (μH)
3.3
4.7
4.7
6.8
I SAT (A)
2.7
1.6
1.8
1.2
Size (mm)
4×4×2
3.9 × 3.9 × 1.1
3.9 × 3.9 × 1.7
3.9 × 3.9 × 1.7
current and lower series resistance for a given physical size.
The input (V IN ) and output (V OUT ) voltages determine the switch
duty cycle (D), which in turn can be used to determine the
inductor ripple current.
Input and Output Capacitors Selection
The ADD5205 requires input and output bypass capacitors to
supply transient currents while maintaining a constant input
D =
V OUT ? V IN
V OUT
and output voltage. Use a low effective series resistance (ESR)
4.7 μF or greater capacitor for the input capacitor to prevent noise
at the ADD5205 input. Place the input between VIN and GND,
Use the duty cycle and switching frequency (f SW ) to determine
the on time (t ON ).
as close as possible to the ADD5205 .
The output capacitor maintains the output voltage and supplies
t ON
=
D
f SW
current to the load while the ADD5205 switch is on. The value
and characteristics of the output capacitor greatly affect the
V IN × t ON
The inductor ripple current (ΔI L ) in a steady state is
Δ I L =
L
Solve for the inductance value (L).
output voltage ripple and stability of the regulator. Use a ceramic
X5R or X7R dielectric capacitor, and for the output capacitor, a
4.7 μF or greater capacitor is preferred.
Place a 100 nF or greater capacitor as close as possible to the
OVP pin of ADD5205 .
L =
V IN × t ON
Δ I L
Diode Selection
The output diode conducts the inductor current to the output
I LPK = I LAVG + Δ I L ,
Ensure that the peak inductor current (that is, the maximum
input current plus half of the inductor ripple current) is less
than the rated saturation current of the inductor. In addition,
ensure that the maximum rated rms current of the inductor is
greater than the maximum dc input current to the regulator.
1
2
capacitor and loads while the switch is off. For high efficiency,
minimize the forward voltage drop of the diode. Schottky diodes
are recommended.
The output diode for a boost regulator must be chosen depending
on the output voltage and the output current. The diode must
be rated for a reverse voltage greater than the output voltage used.
The average current rating must be greater than the maximum
I LAVG =
I OUT × V OUT
η × V IN
load current expected, and the peak current rating must be greater
than the peak inductor current.
V ? V IN
f SW × V OUT
Δ I L =
1
L
V IN OUT
where:
I LPK is the peak inductor current.
I LAVG is the input average current.
Rev. 0 | Page 11 of 16
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