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DF69 Datasheet(PDF) 105 Page - PADAUK Technology.

Part # DF69
Description  DC Fan Controller
PDF  106 Pages
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Manufacturer  PADAUK [PADAUK Technology.]
Direct Link  http://www.padauk.com.tw/
Logo PADAUK - PADAUK Technology.

DF69 Datasheet(HTML) 105 Page - PADAUK Technology.

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DF69
DC Fan Controller
9. POR for DC Fan Application
As shown in Fig 9-1, DF69 generates a good power on reset (POR) signal when VDD rises from 0V to 5V in TPOR
(max. 50ms) and rises through the voltage range of 0.7V to 1.6V in TFSV (max. 10ms).
If there are a lot of abnormal power noises in VDD power-on time period and TPOR and TFSV do not meet the
specifications, DF69 is not able to guarantee circuit initialization and may cause a malfunction.
5V
VDD
VDD Power-on Time
0V
0.7V
1.6V
TFSV
TPOR
TFSV < 10ms
TPOR < 50ms
time
Fig. 9-1
During power-off as shown in Fig 9-2 and Fig 9-3, VDD has to be discharged to VPDRV (max. is 0.7V) for the next
power-on. In case VDD is more than VPDRV, it is not recognized to do the next power-on.
5V
VDD Power-off
0V
Max. is 0.7V
time
VDD
VPDRV
5V
VDD Power-off
0V
Max. is 0.7V
time
VDD
VPDRV
Fig. 9-2
Fig. 9-3
NOTICE:
It may cause DF69 malfunction, fail or crash when power-on and power-off do not meet the specifications.
Another proper POR is needed in order to get rid of such status.
©Copyright 2018, PADAUK Technology Co. Ltd
Page 105 of 106
PDK-DS-DF69_V003 – Apr. 18, 2018



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