ACPL-H342-560E Avago Technologies US Inc., ACPL-H342-560E Datasheet - Page 17

• Manufacturer Part Number: ACPL-H342-560E
• Description: Plastic Optocoupler, LF+T/R
• Manufacturer: Avago Technologies US Inc.
• Series: -r
• Type: Gate Driver, Miller Clampr

Specifications of ACPL-H342-560E

• Voltage - Isolation: 3750Vrms
• Input Type: DC
• Voltage - Supply: 15 V ~ 30 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.268", 6.81mm Width)
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Anti-Cross Conduction to Prevent Current Shoot Through and Determining Dead Time
The ACPL-H342 includes a Propagation Delay Difference (PDD = t
high(Q1) and low(Q2) side power transistors from turning on at the same time. This “Anti-Cross” conduction feature
prevents large currents from flowing through the power transistors by ensuring t
words, the “Anti-Cross” feature will ensure one power transistor is turned off before the other is turned on.
A gate driver without Anti-Cross feature will for example has a PDD
PDD
This is shown in Figure 37. To prevent this and the shoot through current, the turn on of LED2 should be delayed (relative
to the turn off of LED1) so that under worst-case conditions, Q1 has just turned off when Q2 turns on. The amount of
delay to achieve this condition is equal to PDD
Figure 37. Current shoot through without Anti-Cross feature
17
I
V
V
I
LED1
LED2
OUT1
OUT2
MAX
Q2 OFF
of 350ns would mean one transistor will be turn on before the other is off since t
t
PLHMIN
t
PHLMAX
High Side PWM
Low Side PWM
Through
Shoot
Q1 ON
Q2 ON
Q1 OFF
R
R
MAX
LED1
LED2
as shown in Figure 38.
Figure 38. Adding delay to prevent shoot through
I
V
V
I
LED1
LED2
OUT1
OUT2
V
V
OUT1
OUT2
PHL
R
R
MIN
G
G
– t
of -350ns and a PDD
PLH
Q1
Q2
PDD
) specification to help prevent both the
PHLMAX
MAX
= t
Q1 ON
t
Q2 OFF
PHLMAX
PHLMAX
is faster than t
t
+ HVDC
AC
-HVDC
PHLMAX
PLHMIN
- t
PLHMIN
MAX
is longer than t
= 350 ns
Q1 OFF
Q2 ON
of 350ns. A positive
PLHMIN
. In another
PLHMIN
.