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参数资料
| 型号： | IRDCIP1203-A |
| 厂商： | International Rectifier |
| 文件页数： | 7/23页 |
| 文件大小： | 0K |
| 描述： | IP1203 REFERENCE DESIGN KIT |
| 标准包装： | 1 |
| 系列： | iPOWIR™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 15A |
| 输入电压： | 5.5 ~ 13.2 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 400kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | iP1203 |
| 相关产品： | IP1203TRPBF-ND - IC REG BUCK SYNC ADJ 15A 24LGA IP1203PBF-ND - IC REG BUCK SYNC ADJ 15A 24LGA IP1203TR-ND - IC REG BUCK SYNC ADJ 15A 24LGA IP1203-ND - IC REG BUCK SYNC ADJ 15A 24LGA |
| 其它名称： | *IRDCIP1203-A |
iP1203
Applying the Safe Operating Area (SOA) Curve
The SOA graph incorporates power loss and thermal resistance information in a way that allows one to solve for maximum
current capability in a simplified graphical manner. It incorporates the ability to solve thermal problems where heat is drawn
out through the printed circuit board and the top of the case.
0
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60
70
80
90
100
110
120
Procedure
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Case Temperature (oC)
1) Draw a line from Case Temp axis at T CASE to the PCB
Temp axis at T PCB .
2) Draw a vertical line from the T X axis intercept to the SOA
curve. (see AN-1047 for further explanation of T X )
3) Draw a horizontal line from the intersection of the vertical
line with the SOA curve to the Y axis. The point at which
the horizontal line meets the y-axis is the SOA current.
4) If no top sided heatsinking is available, assume T CASE
temperature of 125 °C for worst case performance.
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12
10
8
6
4
2
0
0
V IN = 12V
V OUT = 1.5V
f SW = 300kHz
L=1.0uH
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20
30
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iP1203 SOA
50 60
70
3
80
90
2
100
110
1
120
TX
PCB Temperature (oC)
Adjusting the Power Loss and SOA Curves for Different Operating Conditions
To make adjustments to the power loss curves in Fig. 2, multiply the normalized value obtained from the curves in Figs. 4,
5, 6 or 7 by the value indicated on the power loss curve in Fig. 2. Then if multiple adjustments are required, multiply all of the
normalized values together, then multiply that product by the value indicated on the power loss curve in Fig. 2. The resulting
product is the final power loss based on all factors. See example no. 1.
To make adjustments to the SOA curve in Fig. 3, determine your maximum PCB Temp & Case Temp at the maximum
operating current of each iP1203. Then, add the correction temperature from the normalized curves in Figs. 4, 5, 6 or 7 to
the T X axis intercept (see procedure no. 2 above) in Fig. 3. When multiple adjustments are required, add all of the temperatures
together, then add the sum to the T X axis intercept in Fig. 3. See example no. 2.
Operating Conditions for the following examples:
Output Current = 12A
Output Voltage = 1.2V
Input Voltage = 13.2V
Sw Freq= 400kHz
Inductor = 0.6 μ H
Example 1) Adjusting for Maximum Power Loss:
(Fig. 2) Maximum power loss = 4.1W
(Fig. 4) Normalized power loss for input voltage ≈ 1.025
(Fig. 5) Normalized power loss for output voltage ≈ 0.97
(Fig. 6) Normalized power loss for frequency ≈ 1.08
(Fig. 7) Normalized power loss for inductor value ≈ 1.08
Adjusted Power Loss = 4.1 x 1.025 x 0.97 x 1.08 x 1.08 ≈ 4.75W
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