IR2214 IRF [International Rectifier], IR2214 Datasheet - Page 22

• Manufacturer Part Number: IR2214
• Description: HALF-BRIDGE GATE DRIVER IC
• Manufacturer: IRF [International Rectifier]

IR2214/IR22141(SS)
The minimum size of bootstrap capacitor is:
An example follows:
a) using a 25A @ 125C IGBT (IRGP30B120KD):
And:
the maximum voltage drop V
and the boodstrap capacitor is:
22
Q
I
I
I
Q
I
I
I
T
V
V
V
V
LK_GE
LK_DIODE
LK_CAP
QBS
LK
DS-
HON
G
LS
CC
F
CEonmax
GEmin
= 50 µA (See Static Electrical Charact.);
= 160 nC (Datasheet IRGP30B120KD);
= 1 V
= 150 µA (see Static Electrical Charact.);
= 800 µA (See Static Electrical Charact.);
= 20 nC;
V
= 15 V
15
= 100 µs.
= 100 nA (Datasheet IRGP30B120KD);
BS
time <100 ns);
= 0 (neglected for ceramic capacitor);
= 10.5 V
V
C
= 100 µA (with reverse recovery
= 3.1 V
BOOT
V
1
C
CC
V
BOOT
V
290
10
0
F
min
4 .
5 .
V
nC
V
V
GE
Q
min
3
V
TOT
1 .
BS
BS
725
V
becomes
V
CEon
nF
0
4 .
V
ADVANCE DATA
NOTICE: Here above
sen to be 15V. Some IGBTs may require
higher supply to work correctly with the boot-
strap technique. Also Vcc variations must be
accounted in the above formulas.
Some important considerations
a. Voltage ripple
There are three different cases making the boot-
strap circuit gets conductive (see figure 19):
In this case we have the lowest value for V
This represents the worst case for the bootstrap
capacitor sizing. When the IGBT is turned off
the Vs node is pushed up by the load current
until the high side freewheeling diode get for-
warded biased
To minimize the risk of undervoltage, bootstrap
capacitor should be sized according to the
I
LOAD
side IGBT displaying relevant V
ing on and V
freewheeling diode
In this case we have the highest value for V
Turning on the high side IGBT, I
it and V
<0 case.
I
I
I
LOAD
LOAD
LOAD
V
S
> 0; the load current flows through the
< 0; the load current flows in the low
= 0; the IGBT is not loaded while be-
BS
is pulled up.
V
V
BS
CE
BS
V
can be neglected
CC
V
CC
V
V
CC
F
V
V
CC
F
V
V
has been cho-
CEon
F
V
FP
CEon
LOAD
www.irf.com
flows into
BS
BS
.
.