DLPA3000DPFD datasheet(39/75 Pages) TI1

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DLPA3000

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DLPS052 – OCTOBER 2015

7.3.4.3 Buck Converter Monitoring

The buck converter block is continuously monitored for system failures to prevent damage to the DLPA3000 and

peripherals. Several possible failures are monitored such as a too-high or too-low output voltage. The possible

faults are summarized in Table 4.

Table 4. Buck Converter Fault Indication

POWER GOOD (REGISTER 0X27)

BLOCK

THRESHOLD (RISING EDGE)

Gen.Buck1

BUCK_GP1_PG_FAULT

Ratio 72%

Gen.Buck2

BUCK_GP2_PG_FAULT

Ratio 72%

Gen.Buck3

BUCK_GP3_PG_FAULT

Ratio 72%

OVERVOLTAGE (REGISTER 0X28)

Gen.Buck1

BUCK_GP1_OV_FAULT

Ratio 120%

Gen.Buck2

BUCK_GP2_OV_FAULT

Ratio 120%

Gen.Buck3

BUCK_GP3_OV_FAULT

Ratio 120%

7.3.4.3.1

Power Good

The buck converters as well as the supporting LDO_BUCK have a power good indication. Each buck converter

has a separate indication.

The power good for the three buck converters indicate if their output voltage (PWR5,6,7_FB) is within a defined

window. The relative power good ratio is 72%. This means that if the output voltage is below 72% of the set

voltage the PG_fault bit is set high. The power good bits of the buck converters are in register 0x27 bit:

•

BUCK_GP1_PG_FAULT for BUCK1 (PWR5)

•

BUCK_GP2_PG_FAULT for BUCK2 (PWR6)

•

BUCK_GP3_PG_FAULT for BUCK3 (PWR7)

The LDO_BUCKS that supports the buck converters has its own power good indication. The power good of the

LDO_BUCKS is asserted if the LDO voltage is below 80% (rising edge) or 60% (falling edge) of its intended

value. The power good indication for the LDO_BUCKS is in register 0x29, V5V5_LDO_BUCK_PG_FAULT.

7.3.4.3.2

Overvoltage Fault

An overvoltage fault occurs when an output voltage rises above a pre-defined threshold. Overvoltage faults are

indicated for the buck converters, and LDO_BUCKS. The overvoltage fault of the LDO_BUCKS is asserted if the

LDO voltage is above 7.2 V and can be found in register 0x2A, V5V5_LDO_BUCK_OV_FAULT. The overvoltage

of the general purpose buck converters is 120% of the set value and can be read through register 0x28,

BUCK_GP1,2,3_OV_FAULT.

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