參數(shù)資料
型號(hào)： LTC3880IUJ-1#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
封裝： 6 X 6 MM, LEAD FREE, PLASTIC, WJJD-2, QFN-40
文件頁(yè)數(shù)： 66/112頁(yè)
文件大?。?/td> 2182K
代理商： LTC3880IUJ-1#TRPBF
LTC3880/LTC3880-1
57
3880fa
APPLICATIONS INFORMATION
The following parameters are set as a percentage of the
output voltage if the resistor configuration pins are used
to determined output voltage:
n
VOUT_OV_FAULT_LIMIT.................................... +10%
n
VOUT_OV_WARN.............................................. +7.5%
n
VOUT_MAX....................................................... +7.5%
n
VOUT_MARGIN_HI..............................................+5%
n
POWER_GOOD_ON .............................................–7%
n
POWER_GOOD_OFF............................................–8%
n
VOUT_MARGIN_LO .............................................–5%
n
VOUT_UV_WARN..............................................–6.5%
n
VOUT_UV_FAULT_LIMIT......................................–7%
All other user defined parameters must be programmed
into the NVM. The GUI can be utilized to quickly set up
the part with the desired operating parameters.
The inductance values are based on a 35% maximum
ripple current assumption (5.25A for each channel). The
highest value of ripple current occurs at the maximum
input voltage:
L
=
VOUT
f
IL(MAX)
1–
VOUT
VIN(MAX)
Channel 0 will require 1.05H and channel 1 will require
0.624H. The nearest standard values are 1H and 0.68H
respectively. At the nominal input the ripple will be:
IL(NOM) =
VOUT
f L
1–
VOUT
VIN(NOM)
Channel 0 will have 4.79A (32%) ripple, and channel 1 will
have 5.5A (30%) ripple. The peak inductor current will be
the maximum DC value plus one-half the ripple current
or 17.39A for channel 0 and 17.75A for channel 1. The
minimum on time occurs on channel 1 at the maximum
VIN, and should not be less than 90ns:
tON(MIN) =
VOUT
VIN(MAX) f
=
1.8V
20V 500kHz
(
)
= 180ns
The Vishay IHLP4040DZ-11 1H (2.3mΩ DCRTYP at 25°C)
channel 0 and the VishayIHLP4040DZ-11 0.56H (1.61mΩ
DCRTYP at 25°C) channel 1 are chosen.
Assuming the temperature measurement of the inductor
temperature is accurate and C1 is set to 0.2F, RDisinfinite
and removed from the equations.
R0
=
L
DCR at 25
°C
(
)C1
=
1H
2.3m
0.22F
= 2k
The maximum power loss in R0 is related to the duty
cycle, and will occur in continuous mode at the maximum
input voltage:
PLOSSR0=
VIN(MAX) – VOUT
(
)V
OUT
R1
=
20 – 3.3
(
)3.3
2k
= 27.55mW
The respective values for channel 1 are R1 = 2k, R2 is
open and PLOSSR1 = 20.73mW.
The current limit will be set 20% higher than the peak
value to assure variation in components and noise in the
system do not limit the average current.
VILIMIT = IPEAK RDCR(MAX) = 17.39A 2.5mΩ = 43mV
TheclosestVILIMITsettingis42.9mVor46.4mV.Thevalues
are entered with the IOUT_OC_FAULT_LIMIT command.
Based on expected variation and measurement in the lab
across the sense capacitor the user can determine the
optimal setting. For channel 1 the VILIMT value is 28.6mV.
The closest value Iis 28.6mV.
The power dissipation on the top side MOSFET can be
easilyestimated.ChooseaRENESASRJK0305DPBtopside
MOSFET. RDS(ON) = 10mΩ, CMILLER = 75pF. At maximum
input voltage with T estimated = 50°C and a bottom side
MOSFET a RENESAS RJK0330DPB, RDS(ON) = 3mΩ:
PMAIN =
3.3V
20V
17.39
(
)2 1+ 0.005
(
) 50°C–25°C
(
)
0.01
+ 20V
( )2 8.695A
(
) 1
5 – 2.3
+
1
2.3
75pF
(
) 500kHz
(
)=0.666W
相關(guān)PDF資料
PDF描述
LTC3880IUJ#PBF 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
LTC3880EUJ-1#TRPBF 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
LTC3880EUJ-1#PBF 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
LTC3880IUJ-1#PBF 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
LTC3890EGN-1#PBF SWITCHING CONTROLLER, PDSO28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3883EUH#PBF 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN 制造商:Linear Technology 功能描述:BUCK CNTRL 24V 1MHZ 0.5/5.5V 32QFN 制造商:Linear Technology 功能描述:BUCK, CNTRL, 24V, 1MHZ, 0.5/5.5V, 32QFN 制造商:Linear Technology 功能描述:PWM CONTROLLER, BUCK, 1MHZ, 24V, QFN-32, Input Voltage:24V, Output Voltage:5.5V, Output Current:30A, Supply Voltage Min:4.5V, Supply Voltage Max:24V, Digital IC Case Style:QFN, No. of Pins:32, Frequency:1MHz, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Digitally Programmable, Multiphase Step-Down DC/DC Controll
LTC3883EUH#TRPBF 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Digitally Programmable, Multiphase Step-Down DC/DC Controll
LTC3883EUH-1#PBF 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN 制造商:Linear Technology 功能描述:BUCK CNTRL 24V 1MHZ 0.5/5.5V 32QFN 制造商:Linear Technology 功能描述:BUCK, CNTRL, 24V, 1MHZ, 0.5/5.5V, 32QFN 制造商:Linear Technology 功能描述:PWM CONTROLLER, BUCK, 1MHZ, 24V, QFN-32, Input Voltage:24V, Output Voltage:5.5V, Output Current:30A, Supply Voltage Min:4.5V, Supply Voltage Max:24V, Digital IC Case Style:QFN, No. of Pins:32, Frequency:1MHz, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Digitally Programmable, Multiphase Step-Down DC/DC Controll
LTC3883EUH-1#TRPBF 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN
LTC3883IUH#PBF 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Sync Step Down 4.5V to 24V Input 32-Pin QFN EP 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN 制造商:Linear Technology 功能描述:BUCK CNTRL 24V 1MHZ 0.5/5.5V 32QFN 制造商:Linear Technology 功能描述:BUCK, CNTRL, 24V, 1MHZ, 0.5/5.5V, 32QFN 制造商:Linear Technology 功能描述:PWM CONTROLLER, BUCK, 1MHZ, 24V, QFN-32, Input Voltage:24V, Output Voltage:5.5V, Output Current:30A, Supply Voltage Min:4.5V, Supply Voltage Max:24V, Digital IC Case Style:QFN, No. of Pins:32, Frequency:1MHz, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Digitally Programmable, Multiphase Step-Down DC/DC Controll
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*