参数资料
| 型号： | IR3550MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 16/22页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER GATE 60A PQFN |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | IR3550MTRPBFDKR |
60A Integrated PowIRstage?
IR3550
If any of the application condition, i.e. input voltage,
output voltage, switching frequency, VCC MOSFET driver
voltage or inductance, is different from those of Figure 8, a
set of normalized power loss curves should be used.
Obtain the normalizing factors from Figure 10 to Figure 14
for the new application conditions; multiply these factors
If any of the application condition, i.e. input voltage,
output voltage, switching frequency, VCC MOSFET driver
voltage, or inductance is different from those of Figure 9, a
set of IR3550 case temperature adjustment curves should
be used. Obtain the temperature deltas from Figure 10 to
Figure 14 for the new application conditions; sum these
by the power loss obtained from Figure 8 for the required
deltas and then
subtract from the IR3550 case
load current.
temperature obtained from Figure 9 for the required load
current.
As an example, the power loss calculation procedures
under different conditions, V IN =10V, V OUT =1V, ? SW = 300kHz,
VCC=5V, L=210nH, VCC=5V, I OUT =40A, T AMBIENT = 25°C, no
heat sink, and no air flow, are as follows.
1)
Determine the power loss at 40A under the default
test conditions of V IN =12V, V OUT =1.2 V, ? SW = 400kHz,
L=150nH, VCC=7V, T AMBIENT = 25°C, no heat sink, and no
8)
9)
From Figure 9, determine the highest ambient
temperature at the required load current under the
default conditions, which is 77°C at 40A with 0LFM
airflow and the IR3550 case temperature of 125°C.
Determine the case temperature with V IN =10V, which
is -0.6° based on the dashed lines in Figure 10.
air flow. It is 4.8W from Figure 8.
10) Determine the case temperature with V OUT =1V, which
2)
3)
4)
Determine the input voltage normalizing factor with
V IN =10V, which is 0.96 based on the dashed lines in
Figure 10.
Determine the output voltage normalizing factor with
V OUT =1V, which is 0.92 based on the dashed lines in
Figure 11.
Determine the switching frequency normalizing factor
with ? SW = 300kHz, which is 0.98 based on the dashed
is -1.2° based on the dashed lines in Figure 11.
11) Determine the case temperature with ? SW = 300kHz,
which is -0.3° based on the dashed lines in Figure 12.
12) Determine the case temperature with VCC = 5V, which
is +2.4° based on the dashed lines in Figure 13.
13) Determine the case temperature with L=210nH, which
is -0.8° based on the dashed lines in Figure 14.
lines in Figure 12.
14) Sum the case temperature adjustment from 9) to 13),
5)
6)
7)
Determine the VCC MOSFET drive voltage normalizing
factor with VCC=5V, which is 1.16 based on the dashed
lines in Figure 13.
Determine the inductance normalizing factor with
L=210nH, which is 0.95 based on the dashed lines in
Figure 14.
Multiply the power loss under the default conditions
-0.6° -1.2° -0.3° +2.4° -0.8° = -0.5°. Deduct the delta
from the highest ambient temperature in step 8), 77°C
- (-0.5°C) = 77.5°C.
INDUCTOR CURRENT SENSING CAPACITOR C CS
AND RESISTOR R CS
If the IR3550 is used with inductor DCR sensing, care must
be taken in the printed circuit board layout to make a
by the five normalizing factors to obtain the power
loss under the new conditions, which is 4.8W x 0.96 x
0.92 x 0.98 x 1.16 x 0.95 = 4.58W.
SAFE OPERATING AREA
Figure 9 shows the IR3550 safe operating area with the
case temperature controlled at or below 125°C. The test
conditions are V IN =12V, V OUT =1.2V, ? SW =400kHz, L=150nH
(0.29m Ω), VCC=7V, T AMBIENT = 0°C to 90°C, no heat sink, and
Kelvin connection across the inductor DCR. The DC
resistance of the inductor is utilized to sense the inductor
current. Usually the resistor R CS and capacitor C CS in parallel
with the inductor are chosen to match the time constant of
the inductor, and therefore the voltage across the
capacitor C CS represents the inductor current.
Measure the inductance L and the inductor DC resistance
R L . Pre-select the capacitor C CS and calculate R CS as follows.
Airflow = 0LFM / 100LFM / 200LFM / 400LFM.
March 12, 2012 | FINAL DATASHEET
16
R CS ?
L R L
C CS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3550MTRPBF-CUT TAPE | 制造商:IR 功能描述:1 MHz 60 A Integrated PowIRstage Synchronous Buck Gate Driver - PQFN-32 |
| IR3551 | 制造商:IRF 制造商全称:International Rectifier 功能描述:The IR3551 integrated PowIRstage?? is a synchronous buck gate driver co-packed with a control MOSFET and a synchronous MOSFET with integrated Schottky diode. |
| IR3551MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:The IR3551 integrated PowIRstage?? is a synchronous buck gate driver co-packed with a control MOSFET and a synchronous MOSFET with integrated Schottky diode. |
| IR3551MTRPBF | 功能描述:功率驱动器IC PowIRstage DC DRVR 50A 0.25 (VCC -2.5) RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| IR3553 | 制造商:IRF 制造商全称:International Rectifier 功能描述:40A Integrated PowIRstage?? |
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