Block diagram and pin description L4949E
6/19 Doc ID 4275 Rev 6
Table 2. Pin definitions and functions
Pin N°
Symbol Function
SO-8 SO-20
119 V
S
Input supply voltage. Block to GND via an external
capacitor (see Figure 3).
220 S
I
Sense input pin to supervise input voltage. Connect via an
external voltage divider connected to V
S
and to GND.
31 V
Z
Preregulator output voltage. For details, see Section 3.4:
Preregulator.
42 C
T
Reset pulse delay adjustment. Connecting this pin via a
capacitor to GND
5
4, 5, 6, 7, 14,
15, 16, 17
GND Ground reference
610 RES
Reset output. It is pulled down when the output voltage
goes below V
RT
.
711 S
O
Sense output. This open collector pin must be connected to
V
OUT
via an external resistor. It is pulled down whenever
the S
I
voltage becomes lower than an internal voltage.
812 V
OUT
Output voltage. Block to GND via an external capacitor (see
Figure 3)
- 3, 8, 9, 13, 18 NC Not connected pins
Obsolete Product(s) - Obsolete Product(s)