ACPL-336J-000E View Datasheet(PDF) - Avago Technologies
Part Name
Description
MFG CO.
ACPL-336J-000E
Avago Technologies
'ACPL-336J-000E' PDF : 18 Pages View PDF
Description of UnderVoltage LockOut
Insufficient gate voltage to IGBT can increase turn-on resistance of IGBT, resulting in large power loss and IGBT damage
due to high heat dissipation. ACPL-336J monitors the output power supply constantly. When output power supply is
lower than undervoltage lockout (UVLO) threshold, the gate driver output will shut off to protect IGBT from low voltage
bias. The low output power supply fault will be reported via the UVLO feedback. In this way, the UVLO feedback can also
serve as a READY signal to the controller during power up.
VCC1
VUVLO–
VUVLO+
VCC2
LED1 IF
VOUT
tUVLO_OFF
tUVLO_ON
FAULT
UVLO
tPHL_UVLO
Figure 22. UVLO and feedback behaviors and timing diagram
tPLH_UVLO
Description of Input LED Driver and Split Resistors Circuit
The ACPL-336J has integrated an input LED driver that with high impedance input(VIN+) for interfacing with the con-
troller. The LED driver’s output(VLEDDRV) has to be connected with the recommended split resistors circuit to the LED1
anode to achieve the rated high CMR performance. The LED current can be calculated by ILEDDRV = (VCC1- VF)/(RLEDDRVH
+2R). Alternatively, if the LED driver is not used, LED1 can still be driven directly by other means of discrete driver con-
figuration.
It is recommended that the two resistors (R) connected to input LED’s anode and cathode are split in the ratio 1:1. They
will help to balance the common mode impedances at the LED’s anode and cathode. This helps to equalize the common
mode voltage changes at the anode and cathode to give high CMR performance.
1 VEE1
5V
1 µF
2
VIN+
5V
3 VCC1
4 VLEDDRV
RLEDDRVH
ILEDDRV = (VCC1 - VF)/(RLEDDRVH+2R)
5 UVLO
ILEDDRV 6 FAULT
R
ANODE
7
LED1
R
8 CATHODE
Figure 23. Input LED driver functional diagram
15
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