- 您现在的位置：买卖IC网 > Sheet目录868 > LTM4628EV#PBF (Linear Technology)IC DC/DC UMODULE 16A 144-LGA
LTM4628
APPLICATIONS INFORMATION
K D =
V D = T(KELVIN) ? K D ? ln D
temperature relationship that makes diodes suitable
temperature sensors. The I S term in the equation above
is the extrapolated current through a diode junction when
the diode has zero volts across the terminals. The I S term
varies from process to process, varies with temperature,
and by definition must always be less than I D . Combining
all of the constants into one term:
η ?k
q
where K D = 8.62 ?5 , and knowing ln(I D /I S ) is always posi-
tive because I D is always greater than I S , leaves us with
the equation that:
I
I S
whereV D appearstoincreasewithtemperature.Itiscom-
mon knowledge that a silicon diode biased with a current
source has an approximate –2mV/°C temperature rela-
tionship (Figure 8), which is at odds with the equation. In
fact, the I S term increases with temperature, reducing the
ln(I D /I S ) absolute value yielding an approximate –2mV/°C
composite diode voltage slope.
It is important that the bias current source be accurate and
powered from a high impedance source. This is because
the forward voltage drop is also a function of the current
through the diode.
The below equations show that when currents are a de-
cade apart the V D difference is 60mV; therefore the 10μA
current source error will affect the diode forward voltage
at temperature.
kT/q = 26mV
V D1 – V D2 = kT/q ln(I D1 )/(I D2 )
where V D1 – V D2 is the difference in the diode forward
voltage with the I D1 and I D2 current difference.
Several 1N4148 diodes were tested with 100μA of current
and Figure 9 shows the results. The 100μA current source
provided the best repeatability for each diode.
The tested diodes are very close to –2.2mV/°C to –2.4mV/°C
slope while each are biased with 100μA through a 120k
pull-up resistor to 12V. The Figure 9 graph can be used
to calibrate and measure LTM4628 internal temperature
by measuring the diode V D value.
1.4
1.2
1.0
0.8
0.6
0.4
0.2
I D = 10μA
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–273
–173
–73
27 127
227
0
–100
–50
0
50 100
150
200
TEMPERATURE (°C)
4628 F08
TEMPERATURE (°C)
4628 F09
Figure 8. Silicon Diode Voltage V D vs Temperature
Figure 9. The 1N4148 Diode Voltage V D vs Temperature
4628fe
For more information www.linear.com/LTM4628
19
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
LTM8008HV#PBF
IC DC/DC UMODULE 16-LGA
LTM8020IV#PBF
IC DC/DC UMODULE 200MA 21-LGA
LTM8023MPV#PBF
IC BUCK SYNC ADJ 2A 50LGA
LTM8025MPV#PBF
IC CONVERTER BUCK 3A ADJ 70LGA
LTM8026MPV#PBF
IC UMODULE 36VIN 5A CVCC 81LGA
LTM8027EV#PBF
IC BUCK SYNC ADJ 4A 113LGA
LTM8032MPY#PBF
IC DC/DC UMODULE 2A 71BGA
LTM8033MPV#PBF
IC DC-DC UMODULE BUCK 3A 76-LGA
相关代理商/技术参数
LTM4628EVPBF
制造商:Linear Technology 功能描述:DC/DC Regulator Dual 8A or Single 16A
LTM4628IV#PBF
功能描述:IC DC/DC UMODULE 16A 144-LGA RoHS:是 类别:电源 - 板载 >> DC DC Converters 系列:µModule® 设计资源:VI-200, VI-J00 Design Guide, Appl Manual 标准包装:1 系列:* 类型:隔离 输出数:1 电压 - 输入（最小）:21V 电压 - 输入（最大）:32V Voltage - Output 1:5V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:100W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:9-SlimMod 尺寸/尺寸:4.60" L x 1.80" W x 0.52" H（116.8mm x 45.7mm x 13.2mm） 包装:散装 工作温度:-25°C ~ 85°C 效率:* 电源（瓦特）- 最大:*
LTM4628IVPBF
制造商:LINEAR_DIMENSIONS 制造商全称:LINEAR_DIMENSIONS 功能描述:Dual 8A or Single 16A DC/DC ??Module Regulator
LTM4628IY#PBF
制造商:Linear Technology 功能描述:IC DC/DC UMODULE 16A 144-BGA 制造商:Linear Technology 功能描述:DP-uModule, Dual 8A or Single 16A DC/DC uModule Regulator
LTM4630EV#PBF
制造商:Linear Technology 功能描述:DC/DC CONVERTER DUAL 0.6-1.8 65W 制造商:Linear Technology 功能描述:BUCK UMODULE 15VIN 18A LGA 制造商:Linear Technology 功能描述:DC-DC REGULATOR, BUCK, ADJ, LGA-144, Primary Input Voltage:15V, No. of Outputs:2 制造商:Linear Technology 功能描述:DC-DC REGULATOR, BUCK, ADJ, LGA-144, Primary Input Voltage:15V, No. of Outputs:2, Output Current:36A, No. of Pins:144, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 3 - 168 hours, Package / Case:144-LGA , RoHS Compliant: Yes
LTM4630IV#PBF
制造商:Linear Technology 功能描述:DC/DC CONVERTER DUAL 0.6-1.8 65W 制造商:Linear Technology 功能描述:BUCK UMODULE 15VIN 18A LGA 制造商:Linear Technology 功能描述:DC-DC REGULATOR, BUCK, ADJ, LGA-144, Primary Input Voltage:15V, No. of Outputs:2, Output Current:36A, No. of Pins:144, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 3 - 168 hours, Package / Case:144-LGA , RoHS Compliant: Yes
LTM4633EY#PBF
制造商:Linear Technology 功能描述:DC/DC CNVRTR 2X0.8-1.8V 0.8-5.5V 制造商:Linear Technology 功能描述:IC, DC/DC SMPS, 750KHZ, BGA-144 制造商:Linear Technology 功能描述:DC-DC CONV, BUCK, ADJ, 750KHZ, BGA-144, Primary Input Voltage:16V, No. of Outputs:3, Output Current:10A, No. of Pins:144, Operating Temperature Min:-40C, Operating Temperature Max:125C, Package / Case:144-BGA , RoHS Compliant: Yes
LTM4633MPY#PBF
制造商:Linear Technology 功能描述:IC, DC/DC SMPS, 750KHZ, BGA-144