LM5166DRCT datasheet(29/53 Pages) TI1

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Load (mA)

0.01

0.1

100

500

100

D001

VIN = 8V

VIN = 12V

VIN = 24V

VIN = 36V

VIN = 65V

Load (mA)

0.01

0.1

100

500

4.9

4.92

4.94

4.96

4.98

5.02

5.04

5.06

5.08

5.1

D001

VIN = 8V

VIN = 12V

VIN = 24V

VIN = 36V

LM5166

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SNVSA67A – DECEMBER 2016 – REVISED DECEMBER 2016

Product Folder Links: LM5166

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The recommended high-frequency input capacitance is 2.2 μF or higher and should be a high-quality ceramic

with sufficient voltage rating. Based on the voltage coefficient of ceramic capacitors, choose a voltage rating of

twice the maximum input voltage. Additionally, some bulk capacitance is required if the LM5166 circuit is not

located within approximately 5 cm from the input voltage source. This capacitor provides damping to the

resonance associated with parasitic inductance of the supply lines and high-Q ceramics.

8.2.1.2.7

Soft-start Capacitor – CSS

Connect an external soft-start capacitor for a specific soft-start time. In this example, select a soft-start

capacitance of 33 nF based on Equation 18 to achieve a soft-start time of 4 ms.

8.2.1.2.8

Application Performance Curves

Unless otherwise stated, application performance curves were taken at TA = 25°C.

LF = 150 µH

COUT = 47 µF

FSW(nom) = 100 kHz

RRT = 309 kΩ

Figure 51. Converter Efficiency

LF = 150 µH

COUT = 47 µF

FSW(nom) = 100 kHz

RRT = 309 kΩ

Figure 52. Converter Regulation

Time Scale: 20 ms/Div

CH1: VSW, 5 V/Div

CH2: VOUT, 50 mV/Div

CH4: IL, 200 mA/Div

Figure 53. No Load Switching Waveforms, VIN = 24 V

Time Scale: 10 µs/Div

CH1: VSW, 5 V/Div

CH2: VOUT, 50 mV/Div

CH4: IL, 200 mA/Div

Figure 54. Full Load Switching Waveforms, VIN = 24 V

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