IP3102
Versatile Gate Driver
APPLICATION INFORMATIONS
1.
Operating frequcncy
Ch
arg
ing
_
time
:Tchg=
CT
×
Vchg_pp
Ichg
Disch
arg
ing
_
time
: Tdis=
CT
×
Vchg_pp
Idis
CT : Pin2 Capacitor
Vchg_pp :Amplitude of the Internal oscillator
Ichg : Charging current (Internally fixed)
Idis : Discharging current (Internally )
Total
_
period
:
T
=
Tchg
+
Tdis
1
1
1
1
Operating_Frequcncy
(fo)=
×
= ×
2
Total_Period
2
Tchg
+
Tdis
Final formula
F r e q u e n c y :
fo
=
(1 0 .3 5
×
1 0
−
6
)
×
1
CT
Example)
CT=220pF
fo
=
10.35
×
10
−
6
×
2. Preheating frequency
1
=
47
KHz
220
×
10
−
12
Pr
eheatingCh
arg
ing
_
Time
: Tchg_ph=
CT
×
Vchg_ph_pp
Ichg_ph
CT
×
Vchg_ph_pp
Idis_ph
Pr
eheatingDisch
arg
ing
_
Time
: Tdis_ph=
Pr
eheatingTotal
_ Pr
eiod
:
Tph
=
Tchg
_
ph
+
Tdis
_
ph
1
1
1
1
PreheatingFrequency
(fph)=
×
= ×
2 Pr
eheatingTotal
_
Period
2
Tchg
_
ph
+
Tdis
_
ph
Final formula
fp h
=
0 .1 3 7 5
×
1
2 .0
×
(78
u A
+
)
CT
Rph
CT : Pin2 Capacitor
Vchg_pp :Amplitude of the Internal oscillator
(When preheating)
Ichg : Charging current
(Internally fixed When preheating)
Idis : Discharging current
(Internally When preheating)
Example)
CT=220pF, Rph=27K ohm
fo
=
0.1375
×
1
2.0
1
2.0
×
(78
×
10
−
6
+
)
=
0.1375
×
×
(78
×
10
−
6
+
)
=
95
KHz
CT
Rph
220
×
10
−
12
27
×
10
3
JUNE. 2007(REV1)
http://www.interpionsemi.com
-6-
INTERPOINT [ INTERPOINT CORPORATION COMPANY ]
