參數(shù)資料
型號(hào)： HCPL-5151-300
英文描述： 0.5 Amp Output Current IGBT Gate Drive Optocoupler
中文描述： 0.5安培輸出電流IGBT柵極驅(qū)動(dòng)光電耦合器
文件頁數(shù)： 6/16頁
文件大小： 193K
代理商： HCPL-5151-300
14
CMR with the LED On (CMRH).
A high CMR LED drive circuit
must keep the LED on during
common mode transients. This
is achieved by overdriving the
LED current beyond the input
threshold so that it is not
pulled below the threshold
during a transient. A minimum
LED current of 10 mA provides
adequate margin over the
maximum IFLH of 7 mA to
achieve 10 kV/
s CMR.
CMR with the LED Off (CMRL).
A high CMR LED drive circuit
must keep the LED off (VF ≤
VF(OFF)) during common mode
transients. For example, during
a - dVCM/dt transient in Figure
30, the current flowing through
CLEDP also flows through the
RSAT and VSAT of the logic gate.
As long as the low state voltage
developed across the logic gate
is less than VF(OFF), the LED
will remain off and no common
mode failure will occur.
Figure 30. Equivalent Circuit for Figure 25 During Common Mode Transient
Rg
1
3
VSAT
2
4
8
6
7
5
+
V CM
ILEDP
CLEDP
CLEDN
SHIELD
* THE ARROWS INDICATE THE DIRECTION
OF CURRENT FLOW DURING
dVCM/dt
+5 V
+
V CC = 18 V
* * *
0.1
F
+
_
* * *
_
The open collector drive circuit,
shown in Figure 31, cannot keep
the LED off during a +dVCM/dt
transient, since all the current
flowing through CLEDN must be
supplied by the LED, and it is
not recommended for
applications requiring ultra high
CMRL performance. Figure 32 is
an alternative drive circuit
which, like the recommended
application circuit (Figure 25),
does achieve ultra high CMR
performance by shunting the
LED in the off state.
Figure 31. Not Recommended Open Collector
Drive Circuit
Figure 32. Recommended LED Drive Circuit for
Ultra-High CMR
1
3
2
4
8
6
7
5
CLEDP
CLEDN
SHIELD
+5 V
Q1
ILEDN
1
3
2
4
8
6
7
5
CLEDP
CLEDN
SHIELD
+5 V
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