Circuit board for mechanically fastening a housing

A lamp driver system comprising:

• a housing (5) having a retaining element (4) extending from the housing, said retaining element having at least two retaining flaps (41) and a slot (42) disposed between the retaining flaps;
• a PCB board comprising
• a planar upper surface and a planar lower surface with an elongated through hole passing through the PCB board from the upper surface to the lower surface, the elongated through hole including two tapering elements each disposed on opposing longitudinal sides of the through hole;
• components of a lamp driver circuit mounted on the PCB board;
• and
• a retaining bracket (2) connected to the PCB board and passing over or through the through hole in the PCB board;
• wherein the longitudinal sides of the elongated through hole are orientation at an angle with respect to the retaining bracket;
• wherein the PCB board is mechanically attached to the housing by inserting the retaining element on the housing through the through hole in the PCB board such that the respective retaining flaps are held by the retaining bracket and the respective tapering in the through hole on the PCB board.