FS220-A Feeling Technology Corp., FS220-A Datasheet - Page 9

• Manufacturer Part Number: FS220-A
• Description: 2-Phase High Voltage DC Motor Drive IC
• Manufacturer: Feeling Technology Corp.

FS220
Technology
DARLINGTON-PAIR TRANSISTOR OUTPUT
The figure 4 is the circuit diagram of Darlington-pair transistor. Under the heavy current
loading, the power loss of the high saturation voltage can be calculated into the following
formula:
Pc= (V
+V
) * I
BEQ1
CE(SAT)Q2
o
According to the IC package and the curve of the power loss, the Pc should be applied to
and within the safety value.
45V is the voltage of Zener breakdown diode. However, if the voltage, excluding that of the
power supply, is more than 45V under the long-time operation, the diode will be destroyed.
2,3
Q2
+
V
CE(SAT)
_
Q1
+
V
B E
_
FIG. 4 Darlington-pair Transistor Circuits
Rev0.2 Jun.10, 2003
P
/FS220
9