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

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

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)