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参数资料
| 型号： | LM5067SDX-1 |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, DSO10 |
| 封装： | LLP-10 |
| 文件页数： | 9/24页 |
| 文件大小： | 690K |
| 代理商： | LM5067SDX-1 |
The procedure to calculate the resistor values is as follows:
- Determine the upper UVLO threshold (V
UVH) to enable
Q1, and the lower UVLO threshold (V
UVL) to disable Q1.
- Determine the upper OVLO threshold (V
OVH) to disable
Q1.
- The lower OVLO threshold (V
OVL), to enable Q1, cannot
be chosen in advance 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:
The lower OVLO threshold is calculated from:
As an example, assume the application requires the following
thresholds: V
UVH = -36V, VUVL = -32V, VOVH = -60V.
The lower OVLO threshold calculates to -55.8V, and the OV-
LO hysteresis is 4.2V. 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 following:
Note: Ensure the voltages at the UVLO and OVLO pins do
not exceed the Absolute Maximum ratings for those pins
when the system voltage is at maximum.
Option B:
If all four thresholds must be accurately defined,
the configuration in Figure 12 can be used.
30030951
FIGURE 12. Programming the Four Thresholds
The four resistor values are calculated as follows:
- Determine the upper UVLO threshold (V
UVH) to enable Q1,
and the lower UVLO threshold (V
UVL) to disable Q1.
- Determine the upper OVLO threshold (V
OVH) to disable
Q1, and the lower OVLO threshold (V
OVL) to enable Q1.
17
www.national.com
LM5067
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