參數(shù)資料
型號： LM25066PSQX
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
文件頁數(shù)： 16/48頁
文件大?。?/td> 1456K
代理商： LM25066PSQX
30115841
FIGURE 11. Programming the Four Thresholds
The four resistor values are calculated as follows: - Choose
the upper and lower UVLO thresholds (V
UVH) and (VUVL).
(22)
(23)
- Choose the upper and lower OVLO threshold (V
OVH) and
(V
OVL).
(24)
(25)
As an example, assume the application requires the following
thresholds: V
UVH = 8V, VUVL = 7V, VOVH = 15.5V, and VOVL =
14V. Therefore V
UV(HYS) = 1V and VOV(HYS) = 1.5V. The re-
sistor values are:
R1 = 43.5 k
, R2 = 8.64 k
R3 = 65.2 k
, R4 = 5.27 k
When the R1-R4 resistor values are known, the threshold
voltages and hysteresis are calculated from the following:
(26)
(27)
V
UV(HYS) = R1 x 23 A
(28)
(29)
V
OV(HYS) = R3 x 23 A
Option C:
The minimum UVLO level is obtained by connect-
ing the UVLO/EN pin to VIN as shown in Figure 12. Q
1 is
switched on when the VIN voltage reaches the POR threshold
(
2.6V). The OVLO thresholds are set using R3, R4. Their
values are calculated using the procedure in Option B.
30115850
FIGURE 12. UVLO = POR
23
www.national.com
LM25066
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