+

+

±

+

PWM

Comparator

Driver

ESR

8 k:

+

±

+

VREF

VOUT

VREF

COMP

SW

TPS53317

SLUSAK4D – JUNE 2011 – REVISED JULY 2015

www.ti.com

Feature Description (continued)

7.3.5.5.2

Negative OCL

The negative OCL circuit acts when the converter is sinking current from the output capacitor(s). The converter

continues to act in a valley mode, the typical value of the negative OCL set point is –9.3 A or –6.5 A (depending

on mode selection).

7.3.6 Thermal Protection

The TPS53317 device has an internal temperature sensor. When the temperature reaches a nominal 145°C, the

device shuts down until the temperature decreases by approximately 10°C, when the converter restarts.

7.4 Device Functional Modes

7.4.1 Non-Droop Configuration

The TPS53317 device can be configured as a non-droop solution. The benefit of a non-droop approach is that

load regulation is flat, therefore, in a system where tight DC tolerance is desired, the non-droop approach is

recommended. For the Intel system agent application, non-droop is recommended as the standard configuration.

The non-droop approach can be implemented by connecting a resistor and a capacitor between the COMP and

the VREF pins. The purpose of the type II compensation is to obtain high DC feedback gain while minimizing the

phase delay at unity gain cross over frequency of the converter.

optional, but recommended. Its appropriate capacitance value can be calculated using the desired pole location.

Figure 22 shows the basic implementation of the non-droop mode using the device

Figure 22. Non-Droop Mode Basic Implementation

16

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