Datasheet > ADP2166-EVALZ

ADP2166-EVALZ

更新时间： 2022-05-14 22:16:14

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
23页	670K
描述
5.5 V, 5 A/6 A, High Efficiency, Step-Down DC-to-DC Regulators with Output Tracking

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ADP2166-EVALZ 数据手册

Data Sheet

ADP2165/ADP2166

DESIGN EXAMPLE

ADP2166

= 5V

PVIN

BST

0.1µF

BST

0.47µH

= 1.2V

AVIN

OUT

47µF

16V

100µF

6.3V

OUT2

100µF

6.3V

OUT1

10kΩ

TOP

PGOOD

SYNC

COMP

4.7pF

TRK

BOT

36kΩ

10kΩ

680pF

VREG

1µF

22nF

VREG

GND PGND

Figure 31. Schematic for Design Example

This section describes the procedures for selecting the external

components based on the example specifications listed in Table 7.

See Figure 31 for the schematic of this design example.

This calculation results in L = 0.422 µH. Choose the standard

inductor value of 0.47 µH.

The peak-to-peak inductor ripple current can be calculated by

using the following equation:

Table 7. Step-Down DC-to-DC Regulator Requirements

(V_IN−V_OUT)× D

Parameter

Specification

V_PVIN= 5.0 V 10%

V_OUT= 1.2 V

ΔI_L=

Input Voltage

L × f_SW

Output Voltage

Output Current

Output Voltage Ripple

Load Transient

This calculation results in ∆I_L= 1.617 A.

I_OUT= 6 A

Use the following equation to calculate the peak inductor

current:

∆V_{OUT_RIPPLE}= 12 mV

5%, 1 A to 5 A, 2 A/µs

f_SW= 1.2 MHz

Switching Frequency

∆I_L

_PEAK= I_OUT+

OUTPUT VOLTAGE SETTING

This calculation results in I_PEAK= 6.809 A.

Choose a 10 kΩ resistor as the top feedback resistor (R_TOP

)

and calculate the bottom feedback resistor (R_BOT) by using the

following equation:

Use the following equation to calculate the rms current flowing

through the inductor:













0.6

V_OUT− 0.6

∆I_L

R_BOT= R_TOP×

I_RMS

I_OUT

This calculation results in I_RMS= 6.018 A.

To set the output voltage to 1.2 V, the resistor values are as

follows: R_TOP= 10 kΩ and R_BOT= 10 kΩ.

Based on the calculated current value, select an inductor with

a minimum rms current rating of 6.03 A and a minimum

saturation current rating of 6.9 A.

FREQUENCY SETTING

To use the fixed 1.2 MHz switching frequency, connect the RT

pin to the VREG pin.

However, to protect the inductor from reaching its saturation

point under the current-limit condition, use an inductor that is

rated for at least a 9 A saturation current for reliable operation.

INDUCTOR SELECTION

The peak-to-peak inductor ripple current, ∆I_L, is set to 30% of

the maximum output current. Use the following equation to

estimate the inductor value:

Based on the requirements described previously, select a 0.47 µH

inductor, such as the 744314047 from Würth, which has a 1.35 mΩ

DCR and a 20 A saturation current.

(V_PVIN−V_OUT)× D

L =

∆I_L× f_SW

where:

_PVIN= 5 V.

_OUT= 1.2 V.

D = 0.24.

∆I_L= 1.8 A.

f_SW= 1.2 MHz.

Rev. B | Page 17 of 23

1...14 15 161718 19 20...23

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