LM2591 National Semiconductor, LM2591 Datasheet - Page 6

• Manufacturer Part Number: LM2591
• Description: SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator
• Manufacturer: National Semiconductor

www.national.com
Typical Performance Characteristics
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.5A/div.
C: Output Ripple Voltage, 50 mV/div.
L = 52 µH, C
Continuous Mode Switching Waveforms
V
Horizontal Time Base: 2 µs/div.
IN
ON/OFF Pin Current (Sinking)
= 20V, V
OUT
Switching Frequency
= 100 µF, C
OUT
= 5V, I
OUT
LOAD
ESR = 100 mΩ
10129380
10129313
= 1A
10129320
(Circuit of Figure 1) (Continued)
6
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.25A/div.
C: Output Ripple Voltage, 100 mV/div.
L = 15 µH, C
Discontinuous Mode Switching Waveforms
V
Internal Gain-Phase Characteristics
IN
Horizontal Time Base: 2 µs/div.
= 20V, V
ON/OFF Threshold Voltage
OUT
OUT
= 150 µF, C
= 5V, I
LOAD
OUT
= 250 mA
ESR = 90 mΩ
10129379
10129378
10129319