peb2026 Infineon Technologies Corporation, peb2026 Datasheet - Page 12

• Manufacturer Part Number: peb2026
• Description: Isdn High Voltage Power Controller Ihpc
• Manufacturer: Infineon Technologies Corporation

Data Sheet
Figure 5-4). This filter needs the external capacitor
from the reference-current generated in the bandgap. The value of the reference-current
is defined by the external resistor
In case of overtemperature the thermal protection TH-PROT sinks a current, so that the
current
temperature is limited to about 165 C.
This function is a protection against instant damages due to overload at the outputs.
Continuous high temperatures during operation, however, will reduce the life time of the
IHPC. A maximum junction temperature of 150°C shall not be exceeded (See section 7,
"Electrical Characteristics")
Measures have to be taken to switch off the IHPC in case of a short-circuit. E.g. if pin
APFI indicates active current-limiting, the IHPC should be deactivated after 1.5 sec using
pin PFEN or PFENQ. A consecutive power-up attempt shall give enough time to the
IHPC to cool down again (e.g. 30 sec).
The current
operational-amplifier OP, the transistor
In case of “no current-limiting” the output voltage of the operational-amplifier OP is equal
to the positive OP-supply voltage. The transistor
If the output current
output current at this level.
The voltage level at the gate of transistor
(current-limiting active or not). This state-signal is filtered by a low-pass filter and
generates the logic output APFI. The external capacitor
the corner frequency and the resulting delay times
No.: 18) respectively.
Summarized, the current sensor I-SENS and the high-pass filter prevent, that a
longitudinal disturbance in the frequency range from about (5*f
result in a current limitation. This applies if the maximum amplitude of the longitudinal
current is lower than about half of the current limit (Spec.-No.: 3) defined by the external
resistor
There is also another effect from the current sensing and high-pass filtering, which can
be seen when changing from status LIMOFF to LIMON. This can occur by switching
power on to the line (loading the line capacitor) or in case of short-circuiting the line. The
resulting current transient starts at half of
function) to
R
I
Limit
REF
I
, see also Spec.-No.: 15 and 16.
I
is reduced. So in case of high power dissipation on chip the junction
Line,max
Limit
I
Line,max
is reflected to the output current
with a time constant t
I
(t) = 1000
Line
rises to
I
Line,max
I
R
Limit
REF
(t) = 1000
.
the current-mirror becomes active and keeps the
CHP
T
L
and two resistors (4
3-2
also defined by the value of
T
I
L
Line,max
shows the state of the current-limiter
T
(
t
I
I
L
LIMON
Line
REF
is “switched on”.
C
and increases (capacitor loading
HP
flowing from RA to
(Spec.-No.: 17) and
. This “AC”-current is subtracted
I
C
TH-PROT
TP
of this low-pass filter defines
(t)
Functional Description
, 4 k ).
CHP
I
AC
) to about 100kHz
(t))
C
HP
V
.
t
BAT
LIMOFF
PEB 2026
PEF 2026
using the
(Spec.-
09.99