參數(shù)資料
型號(hào)： LM25066APSQE
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 電源管理
英文描述： POWER SUPPLY SUPPORT CKT, QCC24
封裝： LLP-24
文件頁(yè)數(shù)： 15/48頁(yè)
文件大小： 1658K
代理商： LM25066APSQE
30146029
FIGURE 10. UVLO and OVLO Thresholds Set By R1-R3
The procedure to calculate the resistor values is as follows:
- Choose the upper UVLO threshold (V
UVH) and the lower
UVLO threshold (V
UVL).
- Choose the upper OVLO threshold (V
OVH).
- The lower OVLO threshold (V
OVL) cannot be chosen in ad-
vance in this case, but is determined after the values for R1-
R3 are determined. If V
OVL must be accurately defined in
addition to the other three thresholds, see Option B below.
The resistors are calculated as follows:
(11)
(12)
(13)
The lower OVLO threshold is calculated from:
(14)
As an example, assume the application requires the following
thresholds: V
UVH = 8V, VUVL = 7V, VOVH = 15V.
(15)
(16)
(17)
The lower OVLO threshold calculates to 12.03V and the OV-
LO hysteresis is 2.97V. Note that the OVLO hysteresis is
always slightly greater than the UVLO hysteresis in this con-
figuration. When the R1-R3 resistor values are known, the
threshold voltages and hysteresis are calculated from the fol-
lowing:
(18)
(19)
V
UV(HYS) = R1 x 23A
(20)
(21)
V
OV(HYS) = (R1 + R2) x 23A
Option B:
If all four thresholds must be accurately defined,
the configuration in Figure 11 can be used.
www.national.com
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LM25066A
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