HCPL-5151 Avago Technologies US Inc., HCPL-5151 Datasheet - Page 12

• Manufacturer Part Number: HCPL-5151
• Description: OPTOCOUPLER 0.5A IGBT 8DIP
• Manufacturer: Avago Technologies US Inc.

Specifications of HCPL-5151

• Output Type: Push-Pull, Totem-Pole
• Package / Case: 8-CDIP (0.300", 7.62mm)
• Voltage - Isolation: 1500VDC
• Number Of Channels: 1, Unidirectional
• Current - Output / Channel: 400mA
• Propagation Delay High - Low @ If: 300ns @ 10mA ~ 18mA
• Current - Dc Forward (if): 25mA
• Input Type: DC
• Mounting Type: Through Hole
• Configuration: 1 Channel
• Maximum Propagation Delay Time: 500 ns
• Maximum Forward Diode Voltage: 1.8 V
• Minimum Forward Diode Voltage: 1.2 V
• Maximum Reverse Diode Voltage: 5 V
• Maximum Forward Diode Current: 18 mA
• Maximum Power Dissipation: 295 mW
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Applications Information
Eliminating Negative IGBT Gate Drive
To keep the IGBT firmly off, the HCPL-5150 has a very
low maximum V
realizes this very low V
with 4 W (typical) on resistance in its pull down circuit.
When the HCPL-5150 is in the low state, the IGBT gate is
shorted to the emitter by R
the lead inductance from the HCPL-5150 to the IGBT gate
and emitter (possibly by mounting the HCPL-5150 on a
small PC board directly above the IGBT) can eliminate the
need for negative IGBT gate drive in many applications
as shown in Figure 25. Care should be taken with such
a PC board design to avoid routing the IGBT collector or
emitter traces close to the HCPL-5150 input as this can
result in unwanted coupling of transient signals into the
HCPL-5150 and degrade performance. (If the IGBT drain
must be routed near the HCPL-5150 input, then the LED
should be reverse-biased when in the off state, to prevent
the transient signals coupled from the IGBT drain from
turning on the HCPL-5150.)
Selecting the Gate Resistor (R
ing Losses.
Step 1: Calculate R
The IGBT and R
RC circuit with a voltage supplied by the HCPL-5150.
The V
servative value of V
Figure 6). At lower R
HCPL-5150 is not an ideal voltage step. This results in
lower peak currents (more margin) than predicted by this
analysis. When negative gate drive is not used, V
previous equation is equal to zero volts.
Figure 25. Recommended LED Drive and Application Circuit

CONTROL
COLLECTOR
INPUT
+5 V
OL
74XXX
OPEN
value of 2 V in the previous equation is a con-
R
g
=
270 Ω
=
=
= 30.5 Ω
g
(V
(V
(1 5 V + 5 V – 1.7 V)
g
in Figure 26 can be analyzed as a simple
OL
Minimum from the I
CC
CC
specification of 1.0 V. The HCPL-5150
OL
- V
– V
g
values the voltage supplied by the
1
2
3
4
I
I
at the peak current of 0.6 A (see
OLPEAK
OLPEAK
0.6 A
OL
EE
EE
by using a DMOS transistor
– 1.7 V)
- V
g
g
+ 4 W. Minimizing R
) to Minimize IGBT Switch-
OL
OL
)
Peak Specification.
8
7
6
5
0.1 µF
EE
in the
g
and
+
_
V
CC
Rg
= 18 V
Step 2: Check the HCPL-5150 Power Dissipation and Increase R
Necessary.
The HCPL-5150 total power dissipation (P
sum of the emitter power (P
For the circuit in Figure 26 with I
R
kHz and T
The value of 4.25 mA for I
obtained by derating the I
at -55°C) to I
Since P
increased to reduce the HCPL-5150 power dissipation.
For Q
gives a R
g
= 30.5 W, Max Duty Cycle = 80%, Q
Q1
Q2
P
P
P
P
P
g
P
E
E
O
= 250 nC, from Figure 27, a value of E
T
E
O
O
= 18 mA • 1.8 V • 0.8 = 26 mW
O(SWITCHING MAX)
= 4.25 mA • 20 V + 2.0 µJ • 20 kHz
SW(MAX)
= P
= I
= P
= 85 mW + 40 mW
= 125 mW
> 112 mW (P
for this case is greater than P
g
= I
A
= P
= 112mW – 85 mW
= 27 mW
= 90 W
max = 125°C:
250mW - 23 C • 6mW/ C)
CC
F
CC
+ E
E
O(BIAS)
O(MAX)
• V
+ P
max at 125°C.
• (V
=
= 1.35 µJ
SW
=
F
• Duty Cycle
O
+ P
CC
(R
P
- P
27 mW
20kHz
O(SWITCHING MAX)
- V
g
O(MAX)
o
, Q
O (SWITCHING)
3-PHASE
O(BIAS)
+ HVDC
- HVDC
CC
g
CC
EE
AC
) • f
f
in the previous equation was
E
max of 5 mA (which occurs
) and the output power (P
)
@125 C =
F
(worst case) = 18 mA,
o
o
g
= 250 nC, f = 20
O(MAX)
T
) is equal to the
, R
SW
g
= 1.35 mJ
must be
g
O
if
):