參數(shù)資料
型號: IR3080M
廠商: International Rectifier
英文描述: XPHASE VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT
中文描述: XPHASE VRD10控制集成電路VCCVID
文件頁數(shù): 27/41頁
文件大小: 2267K
代理商: IR3080M
IR3080
DESIGN EXAMPLE 1 - VRD 10 CONVERTER
SPECIFICATIONS
Input Voltage: V
I
=12 V
DAC Voltage: V
DAC
=1.35 V
No Load Output Voltage Offset: V
O_NLOFST
=20 mV
Output Current: I
O
=105 ADC
Maximum Output Current: I
OMAX
=120 ADC
Output Impedance: R
O
=0.91 m
VCC Ready to VCC Power Good Delay: t
VccPG
=0-10mS
VID Delay Time: t
VID
=2.5mS
Soft Start Time: t
SS
=2mS
Over Current Delay: t
OCDEL
=0.5mS
Dynamic VID Down-Slope Slew Rate: SR
DOWN
=2.5mV/uS
Over Temperature Threshold: T
PCB
=115 oC
POWER STAGE
Phase Number: n=6
Switching Frequency: f
SW
=400 kHz
Output Inductors: L=220 nH, R
L
=0.47 m
Output Capacitors: AL-Polymer, C=560uF, R
C
= 7m
, Number Cn=10
IR3080 EXTERNAL COMPONENTS
Oscillator Resistor
Rosc
Once the switching frequency is chosen, R
OSC
can be determined from the curve in Figure 13. For switching
frequency of 400kHz per phase, choose R
OSC
=30.1k
VID Delay Capacitor
C
VIDDEL
Given VID delay time t
VID
=2.5mS
,
the capacitor can is,
t
C
VIDDEL
91
.
Soft Start Capacitor
C
SS/DEL
and Resistor
R
SS/DEL
Because
faster over-current protection is required, the soft start capacitor C
SS/DEL
in series with the resistor
R
SS/DEL
is used. Calculate the soft start capacitor from the required soft start time.
t
I
C
O
10
*
20
35
.
Calculate the soft start resistor from the required over current delay time t
OCDEL
,
=
=
I
DISCHG
10
*
6
The soft start delay time is
I
R
C
t
CHG
10
*
70
nF
VID
42
91
.
10
*
5
10
*
66
*
10
*
66
3
6
6
=
=
=
, choose 47nF
uF
V
SS
CHG
DEL
SS
1
10
*
2
10
*
70
3
3
6
/
=
=
=
=
k
C
I
t
R
DEL
SS
DISCHG
OCDEL
DEL
SS
10
10
6
*
1
10
*
6
6
10
*
5
09
.
09
.
6
3
/
/
mS
I
CHG
DEL
SS
DEL
SS
SSDEL
86
.
)
10
*
70
*
10
6
*
10
3
10
*
1
)
3
6
3
6
/
/
=
=
=
Page 27 of 41
9
/30/04
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