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| 型号： | ISL6263CEVAL1 |
| 厂商： | Intersil |
| 文件页数： | 15/18页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 1 FOR ISL6263C |
| 标准包装： | 1 |
| 系列： | * |
ISL6263C
VDD
OCP
?
+
10μA
↓
+
I SENSE
?
OCSET
ISP
ISN
R OCSET
R S
+
ICOMP
+
?
VO
V N
-
R P
(OPTIONAL)
V RSNS
FIGURE 9. EQUIVALENT MODEL OF CURRENT SENSE USING DISCRETE RESISTOR CURRENT SENSE
0.00393 is the temperature coefficient of the copper. To
make V ICOMP independent of the inductor temperature, the
NTC characteristic is desired to satisfy:
sense. It is recommended to start out using 100 ? for R S and
47pF for C N . Since the current sense resistance changes
very little with temperature, the NTC network is not needed
G 1 ( T ) ? ( 1 + 0.00393 ? T – ( +25 ° C ) ) ? G 1t arg et
(EQ. 16)
for thermal compensation. Discrete resistor sense design
follows the same approach as DCR sense. The voltage on
G 1 ( T ) = -------------------------------------------------------------------------
1 + 0.00393 ? ( T – ( +25 ° C ) )
V N = V RSNS ? ----------------------
V ICOMP = V O + V ? ? ?
? R IS2 ?
R IS1 ?
V ICOMP ( max ) – V O = I OC ? DCR ( 25 ° C ) ? ---------------------------------------------- ? ? 1 + ------------- ?
V ICOMP ( max ) – V O = I OC ? R SNS ? ---------------------- ? ? 1 + ------------- ? (EQ. 22)
V ICOMP ( max ) – V O = I OC ? R SNS ? ? 1 + ------------- ?
R IS1 ?
?
where G 1target is the desired ratio of V N / V DCR . Therefore,
the temperature characteristics G 1 , which determines
parameters selection, is described by Equation 17:
G 1t arg et
(EQ. 17)
It is recommended to begin the DCR current sense design
using the R NTC , R NTCS , and R P component values of the
evaluation board available from Intersil.
Given the inductor DCR and the overcurrent set point I OC , the
maximum voltage of ICOMP pin is determined by
Equation 18:
R N ( +25 ° C ) ? R IS2 ?
R N ( +25 ° C ) + R S ? R IS1 ?
(EQ. 18)
R N , R S , R IS1 , R IS2 should be adjusted to meet the
requirement (V ICOMP(max) - V O ) > 25mV and the time
constant matching according to Equation 10.
The effectiveness of the R N network is sensitive to the
coupling coefficient between the NTC thermistor and the
inductor. The NTC thermistor should be placed in the closet
proximity of the inductor.
Resistor Current Sense
Figure 3 shows a detailed schematic using discrete resistor
sense of the inductor current. Figure 9 shows the equivalent
circuit. Since the current sense resistor voltage represents
the actual inductor current information, R S and C N simply
provide noise filtering. A low ESL sense resistor is strongly
recommended for R SNS because this parameter is the most
significant source of noise that affects discrete resistor
15
the current sense resistor is given by Equation 19:
V RSNS = I O ? R SNS (EQ. 19)
It is optional to parallel a resistor R P to form a voltage divider
with R S to obtain more flexibility. Assume the voltage across
R P is V N , which is given by Equation 20:
R P
R S + R P (EQ. 20)
The current sense amplifier output voltage V ICOMP is given
by Equation 21:
1 + -------------
N ? (EQ. 21)
Given an current sense resistor R SNS and the overcurrent set
point I OC , the maximum voltage of ICOMP pin is determined
by Equation 22:
R P ? R IS2 ?
R S + R P ? R IS1 ?
If R P is not used, the maximum voltage of ICOMP pin is
determined by Equation 23:
? R IS2 ?
(EQ. 23)
R S , R P , R IS1 , R IS2 should be adjusted to meet the
requirement (V ICOMP(max) - V O ) > 25mV.
The current sense traces should be routed directly to the
current sense resistor pads for accurate measurement.
However, due to layout imperfection, the calculated R IS2
may still need slight adjustment to achieve optimum load line
slope. It is recommended to adjust R IS2 after the system has
achieved thermal equilibrium at full load.
FN6745.1
July 8, 2010
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