AUIR3330STRL View Datasheet(PDF) - International Rectifier
Part Name
Description
MFG CO.
'AUIR3330STRL' PDF : 30 Pages View PDF
Bootstrap current measurement:
AUIR3330S
Switching time definition:
As the opposite schematic shows, the dv/dt on & off and
the Td Vout on & off switching time are measured at zero
current value and with a simulated continuous conduction
condition to avoid the di/dt impact (see also the
chronogram above).
Due the inductive load, the drain current level impacts
directly the delay to switch on the output voltage. So the
output voltage duty cycle value changes with the current
level. The output current duty cycle is higher than the
output voltage duty cycle. The di/dt on limit value allows
calculating the complete delay (here named Tcdon and off)
to switch on the output voltage.
4 8 AUIR3330S(L)
Rin
Vcc Tab
2
In
Boot 5
Cboot
Vout
1 If b
Out
Gnd Out2
6
7
100n
15v
Vcc
3
1 Ohm
14v
Figure 1: Switching time test circuit
Tcdonmax
Td
_ Vout
_ onmax
didt
Id
_ onmin
Id
Tcdonmin Td _ Vout _ onmin didt _ onmax
Tcdoffmin Td _Vout _ off min
Tcdoff max Td _Vout _ off max
Tonmin Tin _ on Tdconmax Tcdoffmin
Tonmax Tin _ on Tdconmin Tcdoffmax
All switching time values (except the Td Vout on & off parameters) could change with the application schematic
(output snubber filter) and with the PCB layout. Due to the internal pad, the input pin of the device has a parasitic
capacitor Cin. This capacitor and the Rin (the recommended input resistor) create low pass filter and add an
additional delay in the Tdcon value.
14 www.irf.com © 2012 International Rectifier
May 29, 2014
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