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| 型号： | ISL6261AEVAL2Z |
| 厂商： | Intersil |
| 文件页数： | 20/34页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 2 FOR ISL6261A |
| 标准包装： | 1 |
| 系列： | * |
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ISL6261A
10μA
OC
OCSET
VSUM
R ocset
VO
Rs
Internal to ISL6261A
DROOP
DFB
1
DROOP
VO
R par
R series
Vdcr
I
o
DCR
R ntc
Rn
(Rntc +Rseries )
Rpar
R ntc +Rseries +Rpar
FIGURE 9. EQUIVALENT MODEL FOR DROOP CIRCUIT USING DCR SENSING
R n ( T )
G 1 ( T ) = (EQ. 17)
Static Mode of Operation - Static Droop Using DCR
Sensing
The ISL6261A has an internal differential amplifier to
accurately regulate the voltage at the processor die.
For DCR sensing, the process to compensate the DCR
resistance variation takes several iterative steps. Figure 2
shows the DCR sensing method. Figure 9 shows the
G1, the gain of V n to V DCR , is also dependent on the
temperature of the NTC thermistor:
Δ
R n ( T ) + R s
The inductor DCR is a function of the temperature and is
approximately given by Equation 18:
simplified model of the droop circuitry. The inductor DC
current generates a DC voltage drop on the inductor DCR.
DCR ( T ) = DCR 25 C ? ( 1 + 0 . 00393 * ( T ? 25 ))
(EQ. 18)
Equation 15 gives this relationship.
in which 0.00393 is the temperature coefficient of the copper.
V DCR = I o × DCR
(EQ. 15)
The droop amplifier output voltage divided by the total load
current is given by Equation 19:
An R-C network senses the voltage across the inductor to
get the inductor current information. R n represents the NTC
R droop = G 1 (T) ? DCR ( T ) ? k droopamp
(EQ. 19)
G 1 ( T ) ? ( 1 + 0 . 00393 * ( T ? 25 )) ? G 1 t arg et
network consisting of R ntc , R series and R par . The choice of R s
will be discussed in the next section.
The first step in droop load line compensation is to choose
R n and R s such that the correct droop voltage appears even
at light loads between the VSUM and VO nodes. As a rule of
thumb, the voltage drop across the R n network, V n , is set to
be 0.5 to 0.8 times V DCR . This gain, defined as G1, provides
R droop is the actual load line slope. To make R droop
independent of the inductor temperature, it is desired to
have:
(EQ. 20)
where G 1target is the desired ratio of V n /V DCR . Therefore, the
temperature characteristics G 1 is described by Equation 21:
a fairly reasonable amount of light load signal from which to
derive the droop voltage.
The NTC network resistor value is dependent on the
G 1 ( T ) =
G 1 t arg et
( 1 + 0 . 00393 * ( T ? 25 )
(EQ. 21)
temperature and is given by Equation 16:
For different G1 and NTC thermistor preference, Intersil
R n ( T ) =
( R series + R ntc ) ? R par
R series + R ntc + R par
(EQ. 16)
provides a design spreadsheet to generate the proper value
of R ntc , R series , R par .
R drp1 (R 11 in Fig. 2) and R drp2 (R 12 in Figure 2) sets the
droop amplifier gain, according to Equation 22:
20
k droopamp = 1 +
R drp 2
R drp 1
(EQ. 22)
FN6354.3
November 5, 2009
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