参数资料
型号: IR3092
厂商: International Rectifier
英文描述: 2 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC
中文描述: 2相皓龙,速龙,或控制IC的VR10.X
文件页数: 27/37页
文件大小: 619K
代理商: IR3092
IR3092
Page 27 of 37
06/25/04
DESIGN EXAMPLE
IR3092 Demo Board Rev.2 for VRD10.0 FMB1.5
Input Voltage: V
I
=12 V
DAC Voltage: V
DAC
=1.35 V
No Load Output Voltage Offset: V
O_NLOFST
=25 mV
Output Current: I
O
=80 A DC
Output Current Limit set point: I
LIMIT
=100 A
Output Impedance: R
O
=1.3 m
VCC Ready to VCC Power Good Delay: t
VccPG
=0-10mS
Soft Start Time: t
SS
=2 mS
Dynamic VID Down-Slope Slew Rate: SR
DOWN
=2.5mV/uS
Power Stage Design
Control IC: IR3092
Phase Number: n=2
Switching Frequency: f
SW
=180 kHz
Output Inductor(per phase): L=0.45 uH, R
L
=0.7 m
(1m
when winding temperatures around 120C)
Output Capacitors: C
E
=0.011F, R
CE
=1 m
External Components of IR3092
Once the switching frequency is chosen, R
OSC
can be determined from the curve in the datasheet of
IR3092 data sheet. For switching frequency of 180 kHz per phase,
Choose R
OSC
=47.5k
Calculate the soft start capacitor from the required soft start time 6mS.
t
I
C
O
10
*
25
35
.
With the selected Css value, we can calculate the following delay times:
The Over-Current fault latch delay time
t
OCDEL
will be:
V
C
t
DISCHG
10
*
5
50
F
V
SS
CHG
SS
8
3
3
6
10
*
3
10
*
2
*
10
*
55
*
Choose C
SS =
0.1 uF
mS
I
SS
OCDEL
5
25
.
*
10
*
1
*
6
6
'
Specifications:
Oscillator Resistor Rosc
Soft Start Capacitor C
SS
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