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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)： | 23/39頁 |
| 文件大?。?/td> | 693K |
| 代理商： | IR3009 |
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IR3093
Page 23 of 39
07/15/04
AMD specifies the acceptable power supply regulation window as
±50mV around their specified VID tables. VR-
10.0 specifies the VID table voltages as the absolute maximum power supply voltage. In order to have all three
DAC options, the OPTERON and ATHLON DAC output voltages are pre-positioned 50mV higher than listed in AMD
specs. During testing, a series resistor is placed between EAOUT and FB to cancel the additional 50mV out of the
DAC. The FB bias current, equal to IROSC, develops the 50mV cancellation voltage. Trimming the VDAC voltage
by monitoring V(EAOUT) with this 50mV cancellation resistor in circuit also trims out errors in the FB bias current.
The VDRP pin voltage represents the average current of the converter plus the DAC voltage. The load current can
be retrieved by subtracting the VDAC voltage from the VDRP voltage.
CSINM3
CSINM2
CSINM1
VDRP BUFFER
+
RDRP
CDAC
-
+
ERROR AMPLIFIER
-
RCOMP
VDAC
CCOMP
RDAC
RFB
IROSC
VDRP
VDAC
FB
VOSNS-
VOUT SENSE+
EAOUT
VOUT SENSE-
+ VPOSITIONING -
- V(CSavg) +
IDRP
IROSC
CSINP1
CSINP2
VDAC
-
+
X23.5
CSINP3
VDAC
-
+
X23.5
VDAC
-
+
X23.5
Figure 9 - Adaptive voltage positioning
A resistor R
FB
between FB pin and the converter output is used to create output voltage offset V
O_NLOFST
which is
the difference between V
DAC
voltage and output voltage at no load condition. An internal current source whose
value is programmed by the same external resistor that programs the oscillator frequency, R
ROSC
, pumps current I
FB
out of the FB pin.
The VDRP pin is connected to the FB pin through the Adaptive Voltage Positioning Resistor R
DRP.
Adaptive voltage
positioning lowers the converter voltage by R
O
*I
O,
where R
O
is the
required
output impedance of the converter. R
FB
and R
DRP
are determined by (12) and (13) respectively, where R
O
is the
required
output impedance of the
converter.
V
R
FB
NLOFST
I
O
FB
_
(12)
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