KA3032
4. REGULATOR & RESET FUNCTION
The regulator and reset circuits are as illustrated in Figure 1.
where R1=R2.
• The external circuit is composed of the transistor, KSB772 and a capacitor, about 33[µF]. The capacitor is used as a ripple
eliminator and should have good temperature characteristics.
• The regulator output voltage (pin 41) is decided as follows.
Vout = 2 × 2.5 = 5[V] (where R1=R2)
• When the voltage of pin 44 (Vreset) is at 5[V], regulator output voltage(pin 41) is 5[V], and if 0[V], the output
of pin 41 is 0[V].
voltage
V
CC
KSB772
+
REG OUT
33µF
Vreset
39
40 41
44
2.5V
+
−
R1
R2
KA3032
Figure 1. Regulator circuit
14
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
