Rev. D 11/22

8

HiperLCS-2

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Bit

Hex

Code

Fault

Action

PP Pin Error Fault Name

Description

6

40h

A

100MS_FL_FAULT

Lost FluxLink in burst_off (in super light load). A burst packet should occur a

minimum of every 50 ms. This fault is activated if the burst packet doesn’t

arrive by 100 mS. This fault can often be triggered when secondary bias is

lost (BPS_UV), and secondary device stops operating.

5

20h

A

START_FAULT

Primary mode switch frequency reached FMIN. Reaching FMIN during

start-up is very uncommon. This fault may indicate resonant LLC tank

frequency problem or incorrect PP pin frequency-range selection.

4

10h

A

PCD_SS_FAULT

Start-up problem. From start of primary switching, secondary should send

wake-up command within 32 ms and hand over should occur to secondary

control within 64 ms. Also during start-up frequency confirmation received

signal should be received. If any of these do not occur, then error will be

activated. May indicate excessive C

OUT, excessive load, or insufficient power

delivery.

3

8h

A

SEC_FAULT

Secondary control fault is registered on the primary controller, when ALL

secondary faults declared by the secondary control. For details of secondary

fault see PS pin fault error code table.

2

4h

A

SCD_2PULSE_FAULT

Secondary sending 2 pulse message unexpectedly in secondary control.

Three messages required to trigger the fault. This fault is usually caused by

grounding issues on primary ground, or magnetic coupling from the LLC

transformer to the LSR2000C.

1

2h

A

I_SAFETY_LIM

Safety current limit fault in low-side MOSFET.

0

1h

A

FREQ_FAULT

Frequency confirmation failure fault. The primary control (PP selected),

frequency-range, does not match frequency code received from the second-

ary controller. May be wrong PP pin resistor, or wrong secondary controller

device.

Fault Action:

A = ALL auto-restart or ALL latch off, L = latch-off , I = information only, N = not used (ignore).

Note: Latch-off or auto-restart response is selected via PP pin. See Table 5. PP pin selection 0-3 for auto-restart, selections 4-7 for latch-off.

Table 3.

LCS726x – Primary-Side PP Pin Error Fault Reporting.

LSR2000C – Primary PP Pin and Side PS Pin Error

Fault Bitstream

Note1: The below PP pin error fault-code bit stream message may

include multiple (concurrent) fault bits. The Fault bit stream is

repetitively sent out PP pin during fault-off period. Message initially

starts and bit-15 and continues to bit0. Then repeats continuously

starting with MSB (Bit 31) pre-amble and ending with LSB (Bit 0). For

a bit period of T, logic-1 (high for 2/3.T, low for 1/3.T), and logic-0

(high for 1/3.T, low for 2/3.T).

Below example shows primary-side PP pin bitstream during high-side

over-temperature fault (HSD_OT).

Note2: Similarly, the PS pin error fault-code bit stream message may

include multiple (concurrent) fault bits. The Fault bit stream is

repetitively sent out PS pin during fault-off period. Message initially

starts and bit-15 and continues to bit0. Then repeats continuously

starting with MSB (Bit 31) pre-amble and ending with LSB (Bit 0). For

a bit period of T, logic-1 (high for 2/3.T, low for 1/3.T), and logic-0

(high for 1/3.T, low for 2/3.T).

PI-9641-100722

PP Pin Voltage

Fault Bitstream

Bit Number:

0h

00h

80h

00h

Preamble

Error Code = 0008000h : HSD_OT (high-side over-temperature fault)

15

8

7

0

31

24 23

16

15

8 7

0

31

24