0.65

0.67

0.69

0.71

0.73

0.75

0.77

0.79

0.81

0.83

0.85

0

1

2

3

4

5

6

Output Current (A)

Droop Configuration

TPS53317

www.ti.com

SLUSAK4D – JUNE 2011 – REVISED JULY 2015

Device Functional Modes (continued)

In applications where the DC and the AC tolerances are not separated, (meaning that there is no strict DC

tolerance requirement) the droop method can be used.

Table 1. Mode Definitions

LIGHT-LOAD

SWITCHING

OVERCURRENT

MODE

MODE

POWER SAVING

FREQUENCY

LIMIT (OCL)

RESISTANCE (k

Ω)

MODE

VALLEY (A)

1

0

600 kHz

7.6

2

12

600 kHz

5.4

SKIP

3

22

1 MHz

5.4

4

33

1 MHz

7.6

5

47

600 kHz

7.6

6

68

600 kHz

5.4

PWM

7

100

1 MHz

5.4

8

OPEN

1 MHz

7.6

µF. The applied step load is from 0 A to 2 A.

CH 3: SW

(20 mV/div)

(1 A/div)

(1 V/div)

Figure 28. Droop Configuration Transient Response

Figure 27. Load Regulation (Droop Configuration)

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