LM34923EVAL/NOPB National Semiconductor, LM34923EVAL/NOPB Datasheet - Page 15

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LM34923EVAL/NOPB

Manufacturer Part Number
LM34923EVAL/NOPB
Description
BOARD EVALUATION FOR LM34923
Manufacturer
National Semiconductor
Series
-r
Datasheet

Specifications of LM34923EVAL/NOPB

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Power - Output
-
Voltage - Output
5V
Current - Output
500mA
Voltage - Input
6 ~ 75 V
Regulator Topology
Buck
Frequency - Switching
200kHz
Board Type
Fully Populated
Utilized Ic / Part
LM34923
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Choose the upper and lower thresholds (V
V
As an example, assume the application requires the following
thresholds: V
= 1V. The resistor values calculate to:
Capacitor C6 is added to filter noise and ripple, which may be
present on the V
the threshold voltages and hysteresis are calculated from the
following:
IN
.
R
UVH
UV2
IN
= 15V and V
= 200kΩ, R
line. Where the resistor values are known,
UV1
UVL
= 43.5kΩ
= 14V. Therefore V
UVH
FIGURE 4. LM34923 Example Circuit
and V
UV(HYS)
UVL
) at
(5)
15
The pull-up voltage for the UVO output can be any voltage
under 10V. The maximum continuous current into the UVO
output pin should not exceed 5 mA.
FINAL CIRCUIT
The final circuit is shown in Figure 4. The circuit was tested,
and the resulting performance is shown in Figure 6 and Figure
5.
V
UV(HYS)
= R
UV2
x 5 µA
30141718
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(6)

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