Psychiatrists working in Australia's largest public health system will get a temporary pay bump following mass resignations, but the issues facing a "broken" mental health care system remain.

The NSW wages umpire on Friday awarded a special allowance to the state's public psychiatrists, providing a 20 per cent pay bump for 12 months in a bid to attract and retain staff.

It comes after a long-running dispute, which included more than 200 psychiatrists threatening to resign.

More than 60 followed through, while another 70 shifted from staff jobs to potentially more lucrative visiting roles.

Even before the mass resignations, more than 140 of NSW's 433 public hospital psychiatrist roles were vacant.

The special case justified a temporary allowance to attract and retain staff specialists,

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