參數(shù)資料
型號(hào)： L6716
廠(chǎng)商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, QCC48
封裝： 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFP-48
文件頁(yè)數(shù)： 21/57頁(yè)
文件大?。?/td> 829K
代理商： L6716
Droop thermal compensation
L6716
28/57
Doc ID 14521 Rev 3
12
Droop thermal compensation
Current sense element (DCR inductor) has a non-negligible temperature variation. As a
consequence, the sensed current is subjected to a measurement error that causes the
regulated output voltage to vary accordingly (when droop function is implemented).
To recover from this temperature related error, NTC resistor can be added into feedback
compensation network, as shown in Figure 13.
The output voltage is then driven by the following relationship (neglecting the OFFSET
voltage term):
where RFB is the equivalent feedback resistor and it depends on the temperature through
NTC resistor.
Considering the relationships between IDROOP and the IOUT, the output voltage results:
where T is the temperature.
If the inductor temperature increases the DCR inductor increases and NTC resistor
decreases. As a consequence the equivalent RFB resistor decreases keeping constant the
output voltage respect to temperature variation.
NTC resistor must be placed as close as possible to the sense elements (phase inductor).
Figure 13.
NTC connections for DC load line thermal compensation
V
OUT
V
PROG
R
FB
I
DROOP
()
–
=
V
OUT
TI
OUT
(,
)
[]
V
PROG
R
FB T
[] DCR T
[]
Rg
---------------------- I
OUT
–
=
COMP
To GND_core
(Remote Sense)
ERROR AMPLIFIER
FB
FBG
I
DROOP
To VCC_core
(Remote Sense)
VPROG
VREF
FBG
GND DROP
RECOVERY
I
OS
CP
RF
CF
RFB
NTC
RFB3
RFB2
RFB1
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參數(shù)描述
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