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参数资料
| 型号： | IRDCIP1202-A |
| 厂商： | International Rectifier |
| 文件页数： | 7/29页 |
| 文件大小： | 0K |
| 描述： | BUCK CONV REF DESIGN KIT IP1202 |
| 标准包装： | 1 |
| 系列： | iPOWIR™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 2，非隔离 |
| 功率 - 输出： | 60W |
| 输出电压： | 1.5V，2.5V |
| 电流 - 输出： | 15A，15A |
| 输入电压： | 5.5 ~ 13.2 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | iP1202 |
| 其它名称： | *IRDCIP1202-A |
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out through the printed circuit board and the top of the case.
iP1202
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
Cas e Te m pe ratur e (
Procedure
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.
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
10 20 30 40 50
3
Safe
Operating
Area
V IN = 12V
V OUT 1 = V OUT 2 = 1.5V
I OUT = 15A
f S W = 300kHz
L = 1.8uH
10 20 30 40 50
60
60
70
70
80
80
90
90
100
2
100
110
1
110
120
120
T X
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. Remember that the power loss in Fig 2. is the power loss
for 2 outputs operating with the same output voltage. If differing output voltages are used the initial power loss for each
channel needs to be divided by 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 iP1202. 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:
Output1
Output2
Output Current = 12A
Output Voltage = 1.2V
Output Current = 10A
Output Voltage = 3.3V
Input Voltage = 8V
Sw Freq= 300kHz
Input Voltage =8V
Sw Freq= 300kHz
Inductor = 1.75 μ H
Inductor = 1.75 μ H
Example 1) Adjusting for Maximum Power Loss:
Output1 (Fig. 2) Maximum power loss = W 8.25/2 = 4.125W
(Fig. 4) Normalized power loss for input voltage ≈ 0.93
(Fig. 5) Normalized power loss for output voltage ≈ 0.98
(Fig. 6) Normalized power loss for frequency ≈ 1.0
(Fig. 7) Normalized power loss for inductor value ≈ 0.98
Adjusted Power Loss = 4.125 x 0.93 x 0.98 x 1.0 x 0.98 ≈ 3.7W
www.irf.com
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