
© by SEMIKRON / 2019-07-23 / Technical Explanation / SKYPER
®
42 LJ R
PROMGT.1026/ Rev.7/ Template Technical Explanation
Page 24/35
5.3
Short pulse suppression (SPS)
The SKYPER
42 LJ R driver supresses short on- and off-pulses on the signal inputs TOP_IN/BOT_IN and,
hence, enhances the interferences ruggedness. The time of suppression corresponds to the filter time set
by the customer via the configuration pin CFG_FLT, as described in chapter 4.5.
Figure 17: SKYPER
42 LJ R | Short Pules Suppression
5.4
Undervoltage lockout (UVLO)
The supply voltage of the primary side as well as both positive and both negative gate voltages of the
secondary sides are permanently monitored by the driver. If either the supply voltage or a positive gate
voltage drops below the ‘shutdown’ threshold levels the driver enters into error state. The same applies
when a negative gate voltage exceeds the ‘shutdown’ threshold level. Entered into error state the driver
executes its error routine as described in chapter 5.1.
The error condition is no longer present, when the supply voltage and both positive gate voltages have
exceeded the ‘non-error’ threshold level and both negative gate voltages have dropped below the ‘non-
error’ threshold level. The driver will be ready again for operation after reset, as described in chapter 5.1
Parameter
Min
Typ
Max
Primary side shutdown threshold
11.6V
Primary side non-error threshold
13.1V
Secondary side shutdown threshold, positive gate voltage
9.4V
Secondary side non-error threshold, positive gate voltage
13.3V
Secondary side shutdown threshold, negative gate voltage
-4.1V
Secondary side non-error threshold, negative gate voltage
-5.8V
V
t
t
V
V
IH
V
IL
V
G(on)
V
G(off)
INPUT
OUTPUT