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IR2214 数据表(PDF) 22 Page - International Rectifier

部件名 IR2214
功能描述  HALF-BRIDGE GATE DRIVER IC
PDF  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  IRF [International Rectifier]
网页  http://www.irf.com
标志 IRF - International Rectifier

IR2214 数据表(HTML) 22 Page - International Rectifier

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IR2214/IR22141(SS)
www.irf.com
ADVANCE DATA
The minimum size of bootstrap capacitor is:
An example follows:
a) using a 25A @ 125C IGBT (IRGP30B120KD):
• I
QBS = 800 µA
(See Static Electrical Charact.);
• I
LK = 50 µA
(See Static Electrical Charact.);
• Q
LS = 20 nC;
• Q
G = 160 nC (Datasheet IRGP30B120KD);
• I
LK_GE = 100 nA (Datasheet IRGP30B120KD);
• I
LK_DIODE = 100 µA (with reverse recovery
time <100 ns);
• I
LK_CAP = 0
(neglected for ceramic capacitor);
• I
DS- = 150 µA (see Static Electrical Charact.);
• T
HON = 100 µs.
And:
• V
CC = 15 V
• V
F = 1 V
• V
CEonmax = 3.1 V
• V
GEmin = 10.5 V
the maximum voltage drop
∆V
BS becomes
and the boodstrap capacitor is:
BS
TOT
BOOT
V
Q
C
∆
=
min
=
−
−
−
≤
∆
CEon
GE
F
CC
BS
V
V
V
V
V
min
V
V
V
V
V
4
.
0
1
.
3
5
.
10
1
15
=
−
−
−
=
nF
V
nC
C
BOOT
725
4
.
0
290
=
≥
NOTICE:
Here above V
CC has been cho-
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):
•
I
LOAD < 0; the load current flows in the low
side IGBT displaying relevant V
CEon
In this case we have the lowest value for V
BS.
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
•
I
LOAD = 0; the IGBT is not loaded while be-
ing on and V
CE can be neglected
•
I
LOAD > 0; the load current flows through the
freewheeling diode
In this case we have the highest value for V
BS.
Turning on the high side IGBT, I
LOAD flows into
it and V
S is pulled up.
To minimize the risk of undervoltage, bootstrap
capacitor should be sized according to the
I
LOAD<0 case.
CEon
F
CC
BS
V
V
V
V
−
−
=
F
CC
BS
V
V
V
−
=
FP
F
CC
BS
V
V
V
V
+
−
=



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