UCC28056CDBVT datasheet(20/55 Pages) TI2

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VOSReg

Stopb

>CLK

Ovp2Fltb

TONb

CCO

CCO1

RCO

GND

COMP

VOSNS

GND

VCOClmp

RCODisch

UCC28056

SLUSD37E – OCTOBER 2017 – REVISED NOVEMBER 2019

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Feature Description (continued)

After entering its RDGRdb state, the controller waits for TDGSmpl before reading the pin voltage. To ensure that

the controller consistently detects the external resistance value correctly, do not allow the total external

capacitance connected between the DRV and GND pins to exceed 12 nF.

8.3.4 Transconductance Amplifier with Transient Speed-up Function

The voltage error amplifier is a transconductance amplifier. Voltage loop compensation connects from the error

amplifier output, COMP, to ground. The recommended type-2 compensation network is shown in . For loop-

stability purposes, the controller calculates the compensation network values based on small-signal perturbations

of the output voltage using the nominal transconductance gain gM.

Figure 22. Transconductance Error Amplifier with Typical Compensation Network

To improve the transient response to large perturbations, the error amplifier gain increases by a factor of six

times (6×) when the error amplifier input deviates more than ±3% from the nominal regulation voltage, VOSReg.

This increase allows faster charging and discharging of the compensation components to recover from step

changes in load current.

8.3.5 Faults and Protections

The UCC28056 includes a comprehensive set of protection features to ensure safer and more robust operation

during all operating conditions.

UCC28056CDBVT Datasheet(PDF) 20 Page - Texas Instruments