PEF2023 SIEMENS [Siemens Semiconductor Group], PEF2023 Datasheet - Page 17

• Manufacturer Part Number: PEF2023
• Description: ISDN DC Converter Circuit IDCC
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Note:
Supply Voltage Ranges
Supply Voltage Range 0: 8V to 16V
Supply Voltage Range 1: 12V to 80V
Supply Voltage Range 2: 22V to 90V
Supply Voltage Range 3: U
Undervoltage Lockout
At the undervoltage detection pin UV, a resistor with a value of about 100k ..10M
required to protect this pin against high currents (see absolute maximum ratings). The
level of undervoltage detection when using supply voltage range 1 is 8V..12V, using
supply voltage range 2 or 3, it is 18V..22V. To get a higher undervoltage detection level
a zener diode in series with the resistor is required.
When the PEB/F 2023 detects an undervoltage condition, the gate output driver will be
turned off. The DC/DC conversion is disabled and the PEB/F 2023 shows a high input
impedance seen from the undervoltage detection pins (UV, UVx) and from pin V
GND. Also the voltage on V
removed, the DC/DC converter will be enabled once again with a soft start.
Note:
Semiconductor Group
In this supply voltage range the PEB/F 2023 can be supplied from a 12V battery.
Connect the positive supply voltage via a resistor (R
V
UVx must be connected to pin V
R
Connect the input voltage to pin V
UVx. For calculating the value of this resistor see the description of figure 5.
Connect the input voltage to pin V
connected (floating).
Connect the input voltage via a zener diode (minimum zener voltage U
pin V
(floating).
S
6
and R
An internal 9.4V zener diode protects the V
maximum zener current is 6mA! If the external supply isn’t stabilized, the input
current must be limited (e.g. by a resistor, see also supply voltage range 0)!
via a resistor (R
When using supply voltage range 0 the undervoltage detection circuit is not
working. The resistor connected between V
undervoltage detection circuit (R
S
and via a resistor (R
7
, see the description of figure 6.
6
in figure 6) to GND. Pin UV must be connected to pin V
ZD
+8V to U
EXT
will decrease. When the undervoltage condition is
6
in figure 4) to pin UV. Pin UVx is not connected
EXT
S
ZD
. For calculating the values of the two resistors
and via a resistor (R
S
6
+90V
in figure 6).
and via a resistor to pin UV. Pin UVx is not
17
EXT
input against overvoltages. The
7
S
in figure 6) to pin V
and GND bypasses this
6
in figure 5) to pins UV and
Functional Description
ZD
PEB 2023
PEF 2023
EXT
= 14V) to
and pin
S
08.97
. Pin
S
to
is