IP9001 View Datasheet(PDF) - Interpion semiconductor
Part Name
Description
MFG CO.
'IP9001' PDF : 32 Pages View PDF
IP9001
4-CH MOTOR DRIVE IC FOR PORTABLE CDP
APPLICATION SUMMARY (Continued)
- Short circuit protection
When the output voltage of error amp holds “H” status, then IP9001 starts charging to “CSPRT” with
constant current “ISPRT”.
If the voltage of the CSPRT rises above 1.2V, then the DC/DC converter circuit is disabled.
Disable time is dependent on the external capacitor “CSPRT” , Threshold voltage “VTH”, and internal
constant current source “ISPRT”.
t = C SPRT × VTH (sec)
IS P R T
* VTH=1.2V, ISPRT=10uA
- Soft start circuit
IP9001 accomplishes soft-start-function by attaching external capacitor between DEAD pin and GND.
Maximum duty can be changed by adding external resistor to DEAD pin (pin 4).
t = CDEAD × (R int+ Re xt)(sec)
* Rint=65K ohm, Rext=external resistor
- Power off function
When the input voltage of OFF(pin40) is low, then IP9001 starts charging to “CSPRT” with
constant current “IOFF”.
If the voltage of the CSPRT rises above 1.2V, then the DC/DC converter circuit is disabled.
Disable time is dependent on the external capacitor “CSPRT” , Threshold voltage “VTH”,
and internal constant current source “IOFF”.
t = C SPR T × VTH (sec)
IO F F
* VTH=1.2V, IOFF=20uA
- Over voltage protection
When the sensing voltage of SENS(pin1) is above 8.4V, then IP9001 starts charging to “CSPRT” with
constant current “IHV”.
If the voltage of the CSPRT rises above 1.2V, then the DC/DC converter circuit is disabled.
Disable time is dependent on the external capacitor “CSPRT” , Threshold voltage “VTH”,
and internal constant current source “IHV”.
t = C SP R T × V T H (sec)
IH V
* VTH=1.2V, IOFF=20uA
September. 2003 (Rev.0)
www.interpionsemi.com
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