Adrian Peterson to Baby Mama -- I Never Stiffed You ... On Child Support, Anyway

NFL star Adrian Peterson never skimped on child support to the mother of his 2nd child, not once -- despite her claims -- at least according to official documents obtained by TMZ.

As we reported ... Erica Syion filed court docs back in April, accusing AP of stiffing her on more than $50,000 in unpaid child support and other bills (including travel expenses and tuition) related to their 4-year-old son.

She told us, Adrian eventually settled with her in September, paying all his outstanding bills -- but we've obtained official docs showing child support was NEVER in arrears.

According to the papers, Adrian has dutifully paid his child support to Erica ($2,500 a month) since 2009.

Sources close to AP tell us the court order which determined child support ... did NOT require him to pay tuition and travel expenses -- however when Erica raised the issue, Adrian ponied up.

We've also obtained docs showing Adrian asked the court for more visitation time with his son.