Error handling PHP PDO

In PHP, how do you make the PDO not issue FATAL error so that it is possible to identify and handle the error that occurred?

Example: Table: tb_pedidos: id fk_products qtd 1 5 5 2 7 2 3 2 13

Table: tb_products id description 5 Manga 7 Grape 2 Peach

Being relationship between tb_pedidos.fk_products and tb_products.id .

If I try to exclude Manga (id = 5) from the tb_products table ...

$sql = "DELETE FROM tb_produtos where id = ?"; // query
$rs = $this->conn->prepare($sql); // prepara a query
$arParametros = array(5); // parametro(s) para a query
try {
  $teste = $rs->execute($arParametros); // executa query
} catch (PDOException $err) {// DEVERIA TRATAR EXCEÇÕES PDO
        echo "ERRO PDO.....<br/>";
        var_dump($err->getMessage());
        var_dump($this->conn->errorInfo());
        echo '...fim erros PDO....';
} catch (Exception $err) {// DEVERIA TRATAR OUTRAS EXCEÇÕES (NÃO PDO)
        echo "ERRO NÃO PDO.....<br/>";
        var_dump($err);
        echo "FIM ERRO NÃO PDO.....<br/>";
}

... However, it never enters CATCH , generates the following error and executes the script:

  

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE [23000]: Integrity constraint violation: 1451 Can not delete or update parent row: a foreign key constraint fails ....

How do I stop script execution? That is, to enter the CATCH and make possible the handling of the error?

Notes:

In the connection I use:

$this->conn->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
$this->conn->setAttribute(\PDO::ATTR_EMULATE_PREPARES, false);

My Environment:

• PHP 5.6
• MySQL 5.5