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參數(shù)資料
| 型號： | LTC3816EFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO38 |
| 封裝： | LEAD FREE, PLASTIC, TSSOP-38 |
| 文件頁數(shù)： | 11/44頁 |
| 文件大?。?/td> | 753K |
| 代理商： | LTC3816EFE#PBF |
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LTC3816
3816f
applicaTions inForMaTion
achieve accurate current sensing. Figure 4 shows a real
current sensing resistor, RSENSE, which can be modeled
with an ideal resistance, RSEN, in series with its parasitic
ESL. As shown in Figure 4, the voltage across the sense
resistor includes the voltage across the parasitic induc-
tor which is a strong function of inductor ripple current
and the switching frequency. This effectively reduces the
current limit threshold, typically by more than 30%. The
voltage across the sense resistor can be extracted from
a lowpass filter placed close to the controller input sense
pins as shown in Figure 4. The voltage across the sensing
capacitor, CISR, is:
V
I R
sESL
R
sR
C
CISR
L
SEN
ISR
=
+
1
In the frequency domain, the second term in the above
equation must be equal to 1 to ensure that the voltage
across the filter capacitor is independent of operating
frequency. To meet this requirement, the value of the RC
filter should fulfill the following condition:
R
C
ESL
R
ISR
SEN
=
The ESL value can be obtained from the manufacturer’s
data sheet or estimated with an oscilloscope, as shown in
the Figure 4 waveform, using the following equation:
ESL
V
I
t
ESL ON
ESL OFF
L
ON
OFF
=
+
( )
(
)
1
where tON is the TG on time and tOFF is the TG off time.
Forhighefficiencyapplications,theinductorDCRprovides
amethodofsensingtheinductorcurrentwithoutincurring
additional power loss from a sense resistor. The DCR of
the inductor represents the small amount of resistance
in the copper winding, which can be less than 1m for
today’s low value, high current inductors. Figure 5 shows
a simplified inductor model, which can be modeled with an
ideal inductor, L, in series with its parasitic DCR. The DCR
value can be obtained from the inductor manufacturer’s
data sheet. Similar to the sense resistor application circuit,
the voltage across the inductor DCR can be extracted from
a lowpass filter and the current limit threshold is given by
the following equation:
I
R
I
L PEAK
IMAX
DCR
LOAD MAX
LIMIT
L PE
(
)
(
)
(
=
<
=
AAK
L
IMAX
DCR
L
IDCR
I
R
I
if R
C
L
R
) –
–
2
=
DDCR
+
QB
D
L
QT
VIN
ESL
COUT
VOUT
IL
SENSE RESISTOR
RSEN
RISR
VISR
RIMAX
CISR
TG
BG
BSOURCE
ISENP
ISENN
IMAX
LTC3816
SW
VESL(OFF)
VESL(ON)
3816 F04
VISR = VRSEN + VESL
VRSEN = IL RSEN
Figure 4. Current Limit Sensing Using
a Low Value Sense Resistor
+
QB
D
QT
VIN
L
COUT
3916 F05
VOUT
IL
INDUCTOR
DCR
RIDCR
RIMAX
CIDCR
TG
BG
BSOURCE
ISENP
ISENN
IMAX
LTC3816
SW
Figure 5. Current Limit Sensing Using Inductor DCR
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