參數(shù)資料
型號: IR3081
廠商: International Rectifier
英文描述: XPHASE VR 10.0 CONTROL IC
中文描述: XPHASE村10.0控制IC
文件頁數(shù): 15/20頁
文件大?。?/td> 396K
代理商: IR3081
IR3081
Page 15 of 20
9/1/03
VDAC
Rvdrp
Rfb
ISHARE
VDAC
Ifb
CS+
CS-
EA
Vo
VDRP
IIN
Phase IC
VDAC
ISHARE
CS+
Phase IC
CS-
+
-
Current Sense
Amplifier
10k
VDAC
.
FB
Error
Amplifier
+
-
Current Sense
Amplifier
+
-
+
-
Control IC
Droop
Amplifier
10k
Figure 8 - Adaptive voltage positioning
Inductor DCR Temperature Correction
If the thermal compensation of the inductor DCR provided by the temperature dependent gain of the current sense
amplifier is not adequate, a negative temperature coefficient (NTC) thermistor can be used for additional correction.
The thermistor should be placed close to the inductor and connected in parallel with the feedback resistor, as
shown in Figure 9. The resistor in series with the thermistor is used to reduce the nonlinearity of the thermistor. A
similar network must be placed on the BBFB to ensure proper operation during a transition to a lower VID code with
Body Braking
TM
.
Figure 9 - Temperature compensation of inductor DCR
Remote Voltage Sensing
To compensate for impedance in the ground plane, the VOSNS- pin is used for remote sensing and connects
directly to the load. The VDAC voltage is referenced to VOSNS- to avoid additional error terms or delay related to a
separate differential amplifier. The capacitor connecting the VDAC and VOSNS- pins ensure that high speed
transients are fed directly into the error amp without delay.
Soft Start, Over-Current Fault Delay, and Hiccup Mode
VDAC
Rvdrp
Rfb
Ifb
EA
VDRP
Vo
IIN
Error
Amplifier
+
-
+
-
Control IC
Droop
Amplifier
Rfb
Rt
FB
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