参数资料
型号: IR3093MPBF
厂商: International Rectifier
文件页数: 23/39页
文件大小: 0K
描述: IC VID VOLTAGE PROGRAMMER 48MLPQ
标准包装: 100
应用: VID 电压编程器
电源电压: 7.4 V ~ 21 V
电流 - 电源: 38mA
工作温度: 0°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 48-MLPQ
供应商设备封装: 48-MLPQ(7x7)
包装: 剪切带 (CT)
IR3093PbF
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.
VDAC
CDAC
RDAC
VOSNS-
FB
VDAC
ERROR AMPLIFIER
RCOMP
CCOMP
IROSC
VDAC
VDRP
EAOUT
IROSC
IDRP RDRP
- V(CSav g) +
VDRP BUFFER
VDAC
X23.5
X23.5
-
+
-
+
CSINM3
CSINP3
CSINM2
CSINP2
VDAC
X23.5
-
+
CSINM1
CSINP1
+ VPOSITIONING -
VOUT SENSE+
RFB
VOUT SENSE-
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.
Page 23 of 39
R FB
V O _ NLOFST
I FB
(12)
09/08/05
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