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参数资料
| 型号： | LTC3829EUHF#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PQCC38 |
| 封装： | 5 X 7 MM, LEAD FREE, PLASTIC, M0-220WHKD, QFN-38 |
| 文件页数： | 10/40页 |
| 文件大小： | 478K |
| 代理商： | LTC3829EUHF#PBF |
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LTC3829
3829f
applicaTions inForMaTion
A conservative value for TL(MAX) is 100°C. To scale the
maximum inductor DCR to the desired sense resistor
value, use the divider ratio:
R
DCR
at T
D
SENSE EQUIV
MAX
L MAX
=
(
)
(
)
(
)
C1 is usually selected to be in the range of 0.047F to
0.47F. This forces R1|| R2 to around 2k, reducing error
that might have been caused by the SENSE+ pins’ ±1A
current. TL(MAX) is the maximum inductor temperature.
The equivalent resistance R1|| R2 is scaled to the room
temperature inductance and maximum DCR:
R R
L
DCR at
C C
1 2
20
1
||
(
)
=
°
The sense resistor values are:
R
R R
R
R R
R
D
1
1 2
2
1
=
||
;
The LTC3829 also features a DCR temperature compen-
sation circuit by using a NTC temperature sensor. See
the Inductor DCR Sensing Temperature Compensation
section for details.
The maximum power loss in R1 is related to duty cycle,
and will occur in continuous mode at the maximum input
voltage:
P
R
V
R
LOSS
IN MAX
OUT
1
=
(
)
(
)
Ensure that R1 has a power rating higher than this value.
If high efficiency is necessary at light loads, consider this
power loss when deciding whether to use DCR sensing or
sense resistors. Light load power loss can be modestly
higher with a DCR network than with a sense resistor, due
totheextraswitchinglossesincurredthroughR1.However,
DCR sensing eliminates a sense resistor, reduces conduc-
tion losses and provides higher efficiency at heavy loads.
Peak efficiency is about the same with either method. To
maintain a good signal-to-noise ratio for the current sense
signal, use a minimum
VSENSE of 10mV for duty cycles
less than 40%. For a DCR sensing application, the actual
ripple voltage will be determined by the equation:
=
V
R C
V
f
SENSE
IN
OUT
IN OSC
1 1
Inductor DCR Sensing Temperature Compensation
and the ITEMP Pin
Inductor DCR current sensing provides a lossless method
of sensing the instantaneous current. Therefore, it can
provide higher efficiency for applications of high output
currents. However, the DCR of the inductor, which is the
small amount of DC winding resistance of the copper,
typically has a positive temperature coefficient. As the
temperature of the inductor rises, its DCR value increases.
The current limit of the controller is therefore reduced.
The LTC3829 offers a method to counter this inaccuracy
by allowing the user to place an NTC temperature sensing
resistor near the inductor to actively correct this error. The
ITEMP pin, when left floating, is at a voltage around 5V and
DCR temperature compensation is disabled. The ITEMP
pin has a constant 10A precision current flowing out the
pin. By connecting an NTC resistor from the ITEMP pin to
SGND,themaximumcurrentsensethresholdcanbevaried
over temperature according the following equation:
V
SENSEMAX ADJ
SENSE MAX
ITEMP
(
)
(
)
. –
.
=
1 8
1 3
where:
VSENSEMAX(ADJ)isthemaximumadjustedcurrentsense
threshold.
VSENSE(MAX) is the maximum current sense threshold
specified in the Electrical Characteristics table. It is
typically 75mV, 50mV or 30mV depending on the set-
ting ILIM pins.
VITEMP is the voltage of the ITEMP pin.
The valid voltage range for DCR temperature compensa-
tion on the ITEMP pin is between 0.5V to 0.2V, with 0.5V
or above being no DCR temperature correction and 0.2V
the maximum correction. However, if the duty cycle of the
controller is less than 25%, the ITEMP range is extended
from 0.5V to 0V.
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相关代理商/技术参数 |
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| LTC3829IFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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