file corrupted after downloaded from SQL table

I'm trying to download a file which is saved in the SQL table as base64 string and save it on the webserver. It works with the file size less than 45K. Beyond that, file got corrupted. Can somebody help me solve this issue? Thanks.
PS: We are using MX 6.1
Code:
<cfquery name="file" DATASOURCE="#application.adjsource#" USERNAME="#application.adjuser#" PASSWORD="#application.adjword#">
SELECT a.keyno,a.filename,a.notes,a.bindata
FROM datastore a
WHERE a.keyno = 123
</cfquery>
<cfset filepath = getdirectoryfrompath(getcurrenttemplatepath()) & 'temp\#file.filename#'>
<cfset tmpfile= tobinary(file.bindata)>
<cffile action="write" nameconflict="overwrite" addnewline="yes" output="#tmpfile#" file="#filepath#">