HCPL-3150-560E Ver la hoja de datos (PDF) - Avago Technologies
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HCPL-3150-560E Datasheet PDF : 21 Pages
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+5 V
1
CONTROL
270 Ω
INPUT
2
74XX
OPEN
COLLECTOR
3
GND 1
+5 V
6
270 Ω
CONTROL
INPUT
7
74XX
OPEN
COLLECTOR
8
GND 1
HCPL-315J
16
0.1 μF
15
14
FLOATING
SUPPLY
VCC = 18 V
+
–
Rg
11
0.1 μF
10
9
VCC = 18 V
+
–
Rg
Figure 25b. Recommended LED Drive and Application Circuit (HCPL-315J)
+ HVDC
3-PHASE
AC
- HVDC
Selecting the Gate Resistor (Rg) to Minimize IGBT Switching Losses.
Step 1: Calculate Rg Minimum From the I Peak Specification. The
OL
IGBT and Rg in Figure 26 can be analyzed as a simple RC
circuit with a voltage supplied by the HCPL-3150/315J.
Rg ≥
=
(V – V - V )
CC EE OL
I
OLPEAK
(V – V - 1.7 V)
CC EE
I
OLPEAK
=
(15 V + 5 V - 1.7 V)
0.6 A
= 30.5 Ω
The V value of 2V in the previous equation is a con-
OL
servative value of V at the peak current of 0.6 A (see
OL
Figure 6). At lower Rg values the voltage supplied by the
HCPL-3150/315J 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 in
EE
the previous equation is equal to zero volts.
Step 2: Check the HCPL-3150/315J Power Dissipation and Increase Rg
if Necessary. The HCPL-3150/315J total power dissipation
(P ) is equal to the sum of the emitter power (P ) and the
T
E
output power (P ):
O
P =P +P
TEO
P = I xV xDuty Cycle
E FF
P =P +P
O O(BIAS) O (SWITCHING)
= I x(V - V ) + E (R , Q )xf
CC CC EE
SW G G
For the circuit in Figure 26 with IF (worst case) = 16 mA,
Rg = 30.5 Ω, Max Duty Cycle = 80%, Qg = 500 nC, f = 20
kHz and T max = 90°C:
A
P = 16 mAx1.8 Vx0.8 = 23 mW
E
P = 4.25 mAx20 V + 4.0 μJx20 kHz
O
= 85 mW + 80 mW
= 165 mW > 154 mW (P @ 90°C
O(MAX)
= 250 mW20Cx4.8 mW/C)
14
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