LM25066APSQE/NOPB National Semiconductor, LM25066APSQE/NOPB Datasheet - Page 23

• Manufacturer Part Number: LM25066APSQE/NOPB
• Description: IC CTLR PM HOTSWAP 24-LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM25066APSQE/NOPB

• Applications: Base Station-Networking Line Cards, Servers
• Current - Supply: 5.8mA
• Voltage - Supply: 2.9 V ~ 17 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: *
• Package / Case: *
• Input Voltage: 17V
• Internal Switch: No
• Supply Voltage Range: 2.9V To 5.5V
• Rohs Compliant: Yes
• Digital Ic Case Style: LLP
• No. Of Pins: 24
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM25066APSQE/NOPBTR

The procedure to calculate the resistor values is as follows:
- Choose the upper UVLO threshold (V
UVLO threshold (V
- Choose the upper OVLO threshold (V
- The lower OVLO threshold (V
vance in this case, but is determined after the values for R1-
R3 are determined. If V
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
= 8V, V
UVL
).
UVL
OVL
= 7V, V
must be accurately defined in
OVL
) cannot be chosen in ad-
FIGURE 10. UVLO and OVLO Thresholds Set By R1-R3
OVH
OVH
= 15V.
UVH
).
), and the lower
(11)
(12)
(13)
(14)
(15)
(16)
23
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:
Option B: If all four thresholds must be accurately defined,
the configuration in
V
OV(HYS)
V
Figure 11
UV(HYS)
30146029
= (R1 + R2) x 23µA
= R1 x 23µA
can be used.
www.national.com
(17)
(18)
(19)
(20)
(21)