參數(shù)資料
型號: LT4180EGN#TRPBF
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): 3/18頁
文件大?。?/td> 278K
代理商: LT4180EGN#TRPBF
LT4180
11
4180fa
APPLICATIONS INFORMATION
20μs/DIV
VLOAD
11.9V
4180 F07b
IDITHER
500mA/DIV
Figure 7b. Dither Current and VOUT with
10nF, 37k Compensation 1.5A Load
Figure 8a. 500mA to 1A Transient Response
Test with CHOLD4 = 25nF CHOLD4 Too Small
Figure 7c. Dither Current and VOUT with
3.3nF, 28k Compensation 1.5A Load
Figure 8b. 500mA to 1A Transient Response Test
with CHOLD4 = 47nF Nicely Damped Behavior
20μs/DIV
VLOAD
11.9V
4180 F07c
IDITHER
50mA/DIV
Set Final Value of CHOLD4
Set the minimum value for CHOLD4, by performing a
transient load test of 30% to 60% of the load and set the
value of CHOLD4 to where a nicely damped waveform is
observed. Refer to Figures 8a and 8b for an illustration.
10ms/DIV
VLOAD
1V/DIV
4180 F08a
IDITHER
500mA/DIV
VLOAD
1V/DIV
4180 F08b
IDITHER
500mA/DIV
After all the CHOLD values have been nalized, check for
proper voltage drop correction and converter behavior
(start-up, regulation etc.), over the load and input volt-
age ranges.
Setting Output Voltage, Undervoltage and Overvoltage
Thresholds
The RUN pin has accurate rising and falling thresholds
whichmaybeusedtodeterminewhenVirtualRemoteSense
operation begins. Undervoltage threshold should never
be set lower than the minimum operating voltage of the
LT4180 (3.1V).
The overvoltage threshold should be set slightly greater
than the highest voltage which will be produced by the
power supply or regulator:
VOUT(MAX) = VLOAD(MAX) + VWIRE(MAX)
VOUT(MAX) should never exceed 1.5 VLOAD
Since the RUN and OV pins connect to MOSFET input
comparators, input bias currents are negligible and a com-
mon voltage divider can be used to set both thresholds
(Figure 9).
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