tle6284 Infineon Technologies Corporation, tle6284 Datasheet - Page 11

• Manufacturer Part Number: tle6284
• Description: H-bridge And Half Bridge Driver Ic
• Manufacturer: Infineon Technologies Corporation

Estimation of power loss within the Driver IC
The power loss within the Driver IC is strongly dependent on the use of the driver and the
external components. Nevertheless a rough estimation of the worst case power loss is pos-
sible. Worst case calculation is:
P
With:
P
f
Q
n
const = Constant considering some leakage current in the driver (about 1.2)
I
V
P
This value can be reduced dramatically by usage of external gate resistors.
Conditions :
Data Sheet
PWM
VS(open)
Loss
Loss
VS
RGate
gate
= (Q
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
= Power loss within the Driver IC
= Switching freqency
= Total gate charge of used MOSFETs at 10V V
= Number of switched MOSFETs
= Voltage at Vs
= Power dissipation in the external gate resistors
Junction temperature T
Number of switched MOSFET n = 2
Power dissipation in the external gate resistors P
= Current consumption of driver without connected Mosfets during switching
0
Estimated Power Loss P
0
gate
*n*const* f
10
for different supply voltages V
at Q
Vs = 8V
Vs = 14V
Vs = 18V
PWM Frequency (kHz)
G
20
= 100nC @ V
30
PWM
LOSS
within the Driver IC
GS
40
+ I
= 10V
j
VS(open)
= 25
50
s
o
60
C
)* V
Vs
- P
11
RGate
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
0
0
GS
Estimated Power Loss P
RGate
10
= 0,2*P
Data Sheet TLE6284G
for different gate charges Q
PWM Frequency (kHz)
at supply voltage V
Q
Q
Q
20
G
G
G
= 50nC
= 100nC
= 200nC
30
Loss
LOSS
Rev 2.3 2007-01-11
within the Driver IC
40
s
= 14V
50
G
60