参数资料
型号: LTC3816IFE#PBF
厂商: Linear Technology
文件页数: 36/44页
文件大小: 0K
描述: IC CONTROLLER S-PHASE 38TSSOP
标准包装: 50
应用: 控制器,Intel IMVP-6,IMVP-6.5?
输入电压: 4.5 V ~ 36 V
输出数: 1
输出电压: 0.013 V ~ 1.5 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 38-TFSOP (0.173",4.40mm 宽)裸露焊盘
供应商设备封装: 38-TSSOP 裸露焊盘
包装: 管件
LTC3816
APPLICATIONS INFORMATION
R IDCR =
=
= 2 . 538 k
R IMAX = ? I LIMIT +
= 6 . 89 k
= 29 . 75 A ?
(
) (
)
|| ( R NTC at 0°C ) – R PAR || ( R NTC at 75° C ) ??
R SER ≈ 10 ? R
Forthisexample,aVishayIHLP-5050CE-010.33μHinduc-
tor is chosen. According to the inductor data sheet, it has
a maximum DC current rating of 36.5A and a saturation
current of 62A. At room temperature, the typical DCR is
1.3m? and the maximum DCR is 1.5m?. At 125°C, the
DCR increases to approximately 2.085m?. The R IMAX
resistor value can be calculated.
? ? I L ? R DCR
?
? 2 ? I IMAX ( MIN )
2 .0085m ?
9 μA
Choose 1% resistor R IMAX = 6.98k to ensure that the
regulator can supply the maximum load current under
the worst-case conditions.
If this large DCR variation is a problem, replace this induc-
tor with another inductor with a smaller DCR variation or
use an NTC temperature compensation circuit as shown in
Figure 21. Please refer to the Temperature Compensated
Active Voltage Positioning with Inductor DCR section.
Note that Figure 21 uses a resistive divider and requires
different component values for optimal temperature
compensation.
To derive the voltage drop across the inductor DCR (typically
1.3m?), place a 0.1μF capacitor across the current sense
input pins, I SENP and I SENN . The current sense filter resistor
value R IDCR can be calculated from the equation:
L 0 . 33 μH
R DCR ? C IDCR 1 . 3 m ? ? 0 . 1 μF
Select R IDCR = 2.55k.
For the AVP section (refer to Figure 10), first select a 10k
NTC thermistor. In this example, the Murata NCP18XH103
is chosen. Next, select:
R PAR = R NTC at 25°C = 10k
The R SER resistor value can be obtained from the follow-
ing equation:
3 ? PAR
– ( R PAR || ( R NTC at 25 ° C ) )
From the NTC data sheet:
R NTC at 0°C = 27.2k
R NTC at 75°C = 1.925k
LTC3816
TG
SW
BG
V IN
Q T
Q B
D
R S
I L
L DCR
INDUCTOR
NTC
+
V OUT
C OUT
BSOURCE
I SENP
I SENN
I MAX
R IMAX
R SER
C IDCR
R PAR
3816 F21
Figure 21. Inductor DCR Current Sense Using
NTC Temperature Compensation
3816f
  
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