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參數(shù)資料
| 型號： | LT4180MPGN#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO24 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 4/18頁 |
| 文件大?。?/td> | 278K |
| 代理商： | LT4180MPGN#PBF |
LT4180
12
4180fa
APPLICATIONS INFORMATION
Figure 9. Voltage Divider for Output Voltage, UVL and OVL
The voltage divider resistors can be calculated from the
following equations:
RT =
VOV
200μA
,R4
=
1.22V
200μA
Where RT is the total divider resistance and VOV is the
overvoltage set point.
FindtheequivalentseriesresistanceforR2andR3(RSERIES).
This resistance will determine the RUN voltage level.
RSERIES =
1.22 RT
VUVL
R4
R1
= RT RSERIES R4
R3
=
1.22 V
VOUT(NOM)
R4
RT
VOUT(NOM)
RT
R2
= RSERIES R3
Where VUVL is the RUN voltage and VOUT(NOM) is the
nominal output voltage desired.
For example, with VUVL = 4V, VOV = 7.5V and VOUT(NOM) = 5V,
RT =
7.5V
200μA
= 37.5k
R4
=
1.22V
200μA
= 6.1k
RSERIES =
1.22V 37.5k
4V
6.1k = 5.34k
R1
= 37.5k 5.34k 6.1k = 26.06k
R3
=
1.22 V
5V 6.1k
37.5k
5V
37.5k
= 3.05k
R2
= RSERIES R3 = 2.29k
RSENSE SELECTION
Select the value of RSENSE so that it produces a 100mV
voltage drop at maximum load current. For best accuracy,
VIN and SENSE should be Kelvin connected to this resistor.
Figure 10. Soft-Correct Operation, CHOLD4 = 1μF
R3
FB
4180 F09
RUN
R2
LT4180
R4
OV
R1
VIN
200ms/DIV
4180 F08
5V
POWER SUPPLY
OUTPUT VOLTAGE
10Vw
POWER SUPPLY
INPUT VOLTAGE
Soft-Correct Operation
The LT4180 has a soft-correct function which insures
orderly start-up. When the RUN pin rising threshold is
rst exceeded (indicating VIN has crossed its undervoltage
lockout threshold), power supply output voltage is set to
a value corresponding to zero wiring voltage drop (no
correction for wiring). Over a period of time (determined
by CHOLD4), the power supply output voltage ramps up to
account for wiring voltage drops, providing best load-end
voltage regulation. A new soft-correct cycle is also initiated
whenever an overvoltage condition occurs.
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