ml2280 Microsemi Corporation, ml2280 Datasheet - Page 13

• Manufacturer Part Number: ml2280
• Description: Serial 8-bit Converters
• Manufacturer: Microsemi Corporation

SHUNT REGULATOR
A unique feature of the ML2283 is the inclusion of a shunt
regulator connected from V+ terminal to ground which
also connects to the V
converter supply) through a silicon diode as shown in
Figure 8. When the regulator is turned on, the V+ voltage
is clamped at 11V
typical I-V of the shunt regulator is shown in Figure 9.
RESISTOR, I+ 15mA
CURRENT LIMITING
12V
I +
Figure 9. Shunt Regulator
BE
GND
V+
set by the internal resistor ratio. The
CC
terminal (which is the actual
28.8k
3.2k
3.2k
V
CC
It should be noted that before V+ voltage is high enough
to turn on the shunt regulator (which occurs at about
5.5V), 35k resistance is observed between V+ and GND.
When the shunt regulator is not used, V+ pin should be
either left floating or tied to GND. The temperature
coefficient of the regulator is –22mV/°C.
Figure 10. I-V Characteristic of the Shunt Regulator
15mA
I+
SLOPE =
ML2280, ML2283
35k
1
5.5V
6.9V
V+
13