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參數(shù)資料
| 型號： | IR3009 |
| 廠商： | International Rectifier |
| 英文描述： | 3 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC |
| 中文描述： | 3相皓龍，速龍，或控制IC的VR10.X |
| 文件頁數(shù)： | 13/39頁 |
| 文件大?。?/td> | 693K |
| 代理商： | IR3009 |
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IR3093
Page 13 of 39
07/15/04
Since the voltage drop in the body diode is often higher than output voltage, the inductor current slew rate can be
increased by 2X or more. This patent pending technique is referred to as “body braking” and is accomplished through
the “0% Duty Cycle Comparator”. If the Error Amplifier’s output voltage drops below 0.47V, this comparator turns off
the low side gate driver.
Figure 4 depicts PWM operating waveforms under various conditions
CLK1
PULSE
Figure 4
– PWM Operating Waveforms
Current Sense Amplifier
A high speed differential current sense amplifier is shown in Figure 5. Its gain decreases with increasing temperature
and is nominally 23.5 at 25oC and 20.4 at 125oC (-1400 ppm/oC). This reduction of gain tends to compensate the 3850
ppm/oC increase in inductor DCR. Since in most designs the IR3093 IC junction is hotter than the inductors these two
effects tend to cancel such that no additional temperature compensation of the load line is required.
The current sense amplifier can accept positive differential input up to 75mV and negative up to -25mV before clipping.
The output of the current sense amplifier is summed with the DAC voltage which is used for over current protection,
voltage positioning and current sharing.
Figure 5
– Inductor Current Sensing and Current Sense Amplifier
EAOUT
0.6V
PWM
Ramp1
GATEH1
GATEL1
STEADY-STATE
OPERATION
DUTY CYCLE INCREASE
DUE TO LOAD
INCREASE
DUTY CYCLE DECREASE DUE TO LOAD
DECREASE (BODY BRAKING) OR FAULT
STEADY-STATE
OPERATION
0.47V
C
o
L
R
L
R
s
C
s
V
o
CSA
CO
i
L
v
L
v
c
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