參數(shù)資料
型號: LT3512EMS#PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 0.8 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO12
封裝: LEAD FREE, PLASTIC, MSOP-16/12
文件頁數(shù): 11/26頁
文件大?。?/td> 244K
代理商: LT3512EMS#PBF
LT3512
19
3512fa
APPLICATIONS INFORMATION
Example:
VOUT measured at 200mA and 48VIN
ΔV
OUT
ΔTemp
=
15.42V – 15.02V
125
°C– 50°C
()
= 2.26mV °C
Step 11: Calculate new value for RTC.
R
TC(NEW ) =
R
FB
N
PS
1.85mV
°C
ΔV
OUT
ΔTemp
Example:
R
TC(NEW ) =
237k
2
1.85
2.26
= 97.6k
Step 12: Place new value for RTC, measure VOUT, and
readjust RFB due to RTC change.
R
FB(NEW ) =
V
OUT
V
OUT(MEAS)
R
FB(OLD)
Example:
R
FB(NEW ) =
15V
14.7V
237k
= 243k
Step 13: Verify new values of RFB and RTC over
temperature.
Measure output voltage over temperature with RTC
connected.
Step 14: Optimize compensation.
Now that values for RFB and RTC are fixed, optimize the
compensation. Compensation should be optimized for
transient response to load steps on the output. Check
transient response across the load range.
Example:
The optimal compensation for the application is:
RC = 18.7k, CC = 4.7nF
Step 15: Ensure minimum load.
Check minimum load requirement at maximum input
voltage. The minimum load occurs at the point where the
output voltage begins to climb up as the converter delivers
more energy than what is consumed at the output.
Example:
The minimum load at an input voltage of 72V is:
11mA
Step 16: EN/UVLO resistor values.
Determine amount of hysteresis required.
Voltage hysteresis = 2.6μA R1
Example:
Choose 2V of hysteresis.
R1
=
2V
2.6A
= 768k
Determine UVLO Threshold.
V
IN(UVLO,FALLING) =
1.2V R1
+R2
()
R2
=
1.2V R1
V
IN(UVLO,FALLING) – 1.2V
Set UVLO falling threshold to 30V.
R2
=
1.2V 768k
30V – 1.2V
= 32.4k
V
IN(UVLO,FALLING) =
1.2V R1
+R2
()
R2
=
1.2V 768k
+ 32.4k
()
32.4k
= 30V
VIN(UVLO,RISING) = VIN(UVLO,FALLING) + 2.6μA R1 = 30V
+ 2.6μA 768k = 32V
相關(guān)PDF資料
PDF描述
LT3512HMS#TRPBF 0.8 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO12
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LT3512EMS#TRPBF 0.8 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO12
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