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DP8105 5A DC-DC Intelligent dPOL Data Sheet

8V to 14V Input •••• 0.7V to 5.5V Output

BCD.00261 Rev. 1.0, 12 Feb 2013

www.power-one.com

Page 19 of 35

7.4.3

Errors

This protection group includes only overvoltage

protection.

7.4.3.1

Overvoltage Protection

The overvoltage protection is active whenever the

output voltage of the dPOL exceeds the pre-bias

voltage (if any). If the output voltage exceeds the

overvoltage protection threshold, the overvoltage

error signal is generated, the dPOL turns off, and the

OV bit in the register ST is changed to 0. The high

side switch is turned off instantly, and simultaneously

the low side switch is turned on to ensure reliable

protection of sensitive loads. The low side switch

provides low impedance path to quickly dissipate

energy stored in the output filter and achieve

effective voltage limitation. The OV threshold can be

programmed from 110% to 130% of the output

voltage setpoint, but not lower than 0.5V. Also the

OV threshold will always be at least 0.25V above the

setpoint.

7.4.4

Fault and Error Latching

The user has the option of setting up any protection

option

either

latching/non-latching

and

propagating or non-propagating.

Propagation and Latching for each dPOL is set in the

GUI (Figure 31 below) or directly via the I

2C by

writing into the PC1 register shown in

Figure 32.

Figure 31. GUI dPOL Fault Latching and Propagation Option

Window

If the non-latching protection is selected, a dPOL will

attempt to restart every 130ms until the condition

that triggered the protection is removed. When

restarting, the output voltages follow tracking and

sequencing settings.

If the latching type is selected, a dPOL will turn off

and stay off. The dPOL can be turned on after

130ms, if the condition that caused the fault is

removed and the respective bit in the ST register

was cleared, or the Turn On command was recycled,

or the input voltage was recycled.

PC1: Protection Configuration Register 1

Address: 0x00

R/W-0

R/W-1

R/W-0

R/W-1

TRE

PVE

TRC

OTC

OCC

UVC

OVC

PVC

Bit 7

Bit 0

Bit 7

TRE: Tracking fault enable

1 = enabled

0 = disabled

Bit 6

PVE: Phase voltage error enable

1 = enabled

0 = disabled

Bit 5

TRC: Tracking Fault Protection Configuration

1 = latching

0 = non-latching

Bit 4

OTC: Over Temperature Protection Configuration

1 = latching

0 = non-latching

Bit 3

OCC: Over Current Protection Configuration

1 = latching

0 = non- latching

Bit 2

UVC: Under Voltage Protection Configuration

1 = latching

0 = non- latching

Bit 1

OVC: Over Voltage Protection Configuration

1 = latching

0 = non- latching

Bit 0

PVC: Phase Voltage Protection Configuration

1 = latching

0 = non- latching

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