Interest on interest outstanding for late depositing of tax.

In TDS assessment order, AO charged interest on Outstanding interest for late depositing of tax. we had paid TDS but inadvertantly  the interest payable on late deposit was not paid.

As per me, AO can not charge interest on interest, Dear readers if you could, please provide your view and section or case law reference by which AO has power to charge such interest.

Thanking you in anticipation.