UCD3138 datasheet(19/99 Pages) TI2

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8.7 Power Supply Sequencing

TPOR

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V33D

IReset

3.3 V

TPOR

VGH

VGL

Vres

Brown Out

Figure 8-3. Power-On Reset (POR) and Brown-Out Reset (BOR)

Table 8-2. Power-On Reset (POR) and Brown-Out Reset (BOR) Term Definitions

TERM

DEFINITION

VGH

This is the V33D threshold where the internal power is declared good. The UCD3138 comes out of reset when above

this threshold.

VGL

This is the V33D threshold where the internal power is declared bad. The device goes into reset when below this

threshold.

Vres

This is the V33D threshold where the internal reset signal is no longer valid. Below this threshold the device is in an

indeterminate state.

IReset

This is the internal reset signal. When low, the device is held in reset. This is equivalent to holding the reset pin on

the IC high.

TPOR

The time delay from when VGH is exceeded to when the device comes out of reset.

Brown out

This is the V33D voltage threshold at which the device sets the brown out status bit. In addition an interrupt can be

triggered if enabled.

8.8 Peripherals

8.8.1 Digital Power Peripherals (DPPs)

At the core of the UCD3138 controller are three DDPs. Each DPP can be configured to drive from one to eight

DPWM outputs. Each DPP consists of:

• Differential input error ADC (EADC) with sophisticated controls

• Hardware accelerated digital 2-pole/2-zero PID based compensator

• Digital PWM module with support for a variety of topologies

These can be connected in many different combinations, with multiple filters and DPWMs. They are capable of

supporting functions like input voltage feed forward, current mode control, and constant current/constant power,

and so forth. The simplest configuration is shown in the following figure:

www.ti.com

UCD3138

SLUSAP2J – MARCH 2012 – REVISED NOVEMBER 2021

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