LM2595 datasheet(7/29 Pages) NSC

7 / 29 page

Typical Performance Characteristics (Circuit of Figure 1) (Continued)

Feedback Pin

Bias Current

DS012565-10

Continuous Mode Switching Waveforms

IN = 20V, VOUT = 5V, ILOAD = 1A

L = 68 µH, C

OUT = 120 µF, COUT ESR = 100 mΩ

DS012565-17

A: Output Pin Voltage, 10V/div.

B: Inductor Current 0.5A/div.

C: Output Ripple Voltage, 50 mV/div.

Horizontal Time Base: 2 µs/div.

Discontinuous Mode Switching Waveforms

IN = 20V, VOUT = 5V, ILOAD = 600 mA

L = 22 µH, C

OUT = 220 µF, COUT ESR = 50 mΩ

DS012565-18

A: Output Pin Voltage, 10V/div.

B: Inductor Current 0.5A/div.

C: Output Ripple Voltage, 50 mV/div.

Horizontal Time Base: 2 µs/div.

Load Transient Response for Continuous Mode

IN = 20V, VOUT = 5V, ILOAD = 250 mA to 750 mA

L = 68 µH, C

OUT = 120 µF, COUT ESR = 100 mΩ

DS012565-19

A: Output Voltage, 100 mV/div. (AC)

B: 250 mA to 750 mA Load Pulse

Horizontal Time Base: 100 µs/div.

Load Transient Response for Discontinuous Mode

IN = 20V, VOUT = 5V, ILOAD = 250 mA to 750 mA

L = 22 µH, C

OUT = 220 µF, COUT ESR = 50 mΩ

DS012565-20

A: Output Voltage, 100 mV/div. (AC)

B: 250 mA to 750 mA Load Pulse

Horizontal Time Base: 200 µs/div.

LM2595 Datasheet(PDF) 7 Page - National Semiconductor (TI)