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| 型号： | ADP2323-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 23/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL ADP2323 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 1.2V，3.3V |
| 电流 - 输出： | 3A，3A |
| 输入电压： | 4.5 ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 250kHz ~ 1.2MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP2323 |
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( V IN ? V OUT ) × D
L × f SW
I PEAK = I OUT +
DataSheet
DESIGN EXAMPLE
This section explains design procedure and component selection as
shown in Figure 50; Table 11 provides a list of the required
settings.
Table 11. Dual Step-Down DC-to-DC Regulator Requirements
Parameter Specification
Channel 1
Input Voltage V IN1 = 12.0 V ± 10%
Output Voltage V OUT1 = 1.2 V
Output Current I OUT1 = 3 A
Output Voltage Ripple ΔV OUT1_RIPPLE = 12 mV
Load Transient ±5%, 0.5 A to 3A, 1 A/μs
Channel 2
ADP2323
Calculate the peak-to-peak inductor ripple current as follows:
? I L =
For V OUT1 = 1.2 V, ΔI L1 = 0.98 A. For V OUT2 = 3.3 V, ΔI L2 = 1.02 A.
Find the peak inductor current by using the following equation:
? I L
2
For the 1.2 V rail, the peak inductor current is 3.49 A, and for
the 3.3 V rail, the peak inductor current is 3.51 A.
The rms current through the inductor can be estimated by
I RMS = I OUT 2 +
Input Voltage
Output Voltage
Output Current
Output Voltage Ripple
Load Transient
Switching Frequency
V IN2 = 12.0 V ± 10%
V OUT2 = 3.3 V
I OUT2 = 3 A
ΔV OUT2_RIPPLE = 33 mV
±5%, 0.5 A to 3 A, 1 A/μs
f SW = 500 kHz
? I L 2
12
The rms current of the inductor for both 1.2 V and 3.3 V is
approximately 3.01 A.
For the 1.2 V rail, select an inductor with a minimum rms
OUTPUT VOLTAGE SETTING
Choose a 10 k? top feedback resistor (R TOP ); calculate the bottom
feedback resistor by using the following equation:
current rating of 3.01 A and a minimum saturation current
rating of 3.49 A. For the 3.3 V rail, select an inductor with a
minimum rms current rating of 3.01 A and a minimum
saturation current rating of 3.51 A.
R BOT = R TOP × ? ?
0 . 6
?
?
?
?
V OUT ? 0 . 6 ? ?
Based on these requirements, for the 1.2 V rail, select a 2.2 μH
inductor, such as the Sumida CDRH105RNP-2R2N, with a
DCR = 7.2 m?; for the 3.3 V rail, select a 4.7 μH inductor, such
To set the output voltage to 1.2 V, the resistor values are R TOP1 = 10
k? and R BOT1 = 10 k?. To set the output voltage to 3.3 V, the
resistors values are R TOP2 = 10 k? and R BOT2 = 2.21 k?.
CURRENT-LIMIT SETTING
For 3 A output current operation, the typical peak current limit
is 4.8 A. In this case, no R ILIM is required.
as the Sumida CDRH105RNP-4R7N, with a DCR = 12.3 m?.
OUTPUT CAPACITOR SELECTION
The output capacitor is required to meet the output voltage
ripple and load transient requirement. To meet the output
voltage ripple requirement, use the following equation to
calculate the ESR and capacitance:
FREQUENCY SETTING
To set the switching frequency to 500 kHz, use the following
C OUT _ RIPPLE =
? I L
8 × f SW × ? V OUT _ RIPPLE
R OSC ( kΩ ) =
? V OUT _ RIPPLE
R ESR =
( V IN ? V OUT ) × D
? I L × f SW
C OUT _ OV =
( V OUT + ? V OUT _ OV ) 2 ? V OUT 2
K UV × ? I STEP 2 × L
2 × ( V IN ? V OUT ) × ? V OUT _ UV
equation to calculate the resistor value, R OSC :
60 , 000
f SW ( kHz )
Therefore, R OSC =100 k?.
INDUCTOR SELECTION
The peak-to-peak inductor ripple current, ΔI L , is set to 30% of
the maximum output current. Use the following equation to
estimate the value of the inductor:
L =
For V OUT1 = 1.2 V, Inductor L1 = 2.4 μH, and for V OUT2 = 3.3 V,
Inductor L2 = 5.3 μH.
Select the standard inductor value of 2.2 μH and 4.7 μH for the
1.2 V and 3.3 V rails.
I L
For V OUT1 = 1.2 V, C OUT_RIPPLE1 = 20 μF and R ESR1 = 12 m?. For
V OUT2 = 3.3 V, C OUT_RIPPLE2 = 7.7 μF and R ESR2 = 32 m?.
To meet the ±5% overshoot and undershoot requirement, use
the following equation to calculate the capacitance:
K OV × ? I STEP 2 × L
C OUT _ UV =
For estimation purposes, use K OV = K UV = 2. For V OUT1 = 1.2 V, use
C OUT_OV1 = 191 μF and C OUT_UV1 = 21 μF. For V OUT2 = 3.3 V, use
C OUT_OV2 = 54 μF and C OUT_UV2 = 20 μF.
Rev. A | Page 23 of 32
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