CIN: TAIYO YUDEN X5R JMK325BJ226MM

CCUK: TAIYO YUDEN X5R EMK316BJ105MF

COUT: TAIYO YUDEN X5R JMK325BJ226MM

D: ON SEMICONDUCTOR MBR0520

L1: SUMIDA CR32-150

L2: SUMIDA CR32-470

CCUK

1 PF

COUT

22 PF

L2

47 PH

VIN

5V

D

CFF

330 pF

RFB1

29.4k

RFB2

10k

VIN

SW

NFB

GND

SHDN LM2611A

1

2

3

4

5

CIN

22 PF

L1

15 PH

VOUT - 5V

300 mA

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OUTPUT VOLTAGE (-V)

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LM2611

SNOS965J – JUNE 2001 – REVISED DECEMBER 2015

www.ti.com

Typical Application (continued)

It is a good idea to add a placeholder for a small capacitor across the top feedback resistor to act as a feed-

forward component to optimize transient response. Optimization of the feed-forward capacitor depends a lot on

the specific parameters including the parasitic components associated with the capacitors. Experimentation is

key to ensure ideal sizing of the capacitor (either using load transient response or a loop response analyzer).

See Improving Transient Response and Compensation for details regarding the CFF capacitor.

8.2.1.3 Application Curves

Figure 22. Maximum Output Current vs Output Voltage at

Figure 23. Maximum Output Current vs Output Voltage at

VIN = 12 V (L1 = L2 = 22 µH)

VIN = 5 V (L1 = L2 = 22 µH)

8.2.2 5-V to –5-V Inverting Converter

Figure 24. 5-V to –5-V Inverting Converter Schematic

8.2.2.1 Design Requirements

This design converts 5 V (VIN) to –5 V (VOUT). Adjust RFB2 to set a different output voltage.

14

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