VIPer53EDIP - E / VIPer53ESP - E
3 Pin connections and function
Pin connections and function
Figure 1.
Pin connection (top view)
COMP 1
OSC 2
SOURCE 3
SOURCE 4
8 TOVL
7 VDD
6 NC
5 DRAIN
DIP-8
Figure 2.
Current and voltage conventions
I
DD
DRAIN
NC
NC
NC
VDD
TOVL
3
4
5
1
2
PowerSO-10
I
D
10
9
8
7
6
SOURCE
NC
NC
OSC
COMP
V
DD
VDD
V
OSC
I
OSC
OSC
15V
I
TOVL
TOVL
V
TOVL
V
COMP
COMP
I
COMP
DRAIN
SOURCE
V
DS
Table 10.
Pin function
Pin Name Pin Function
V
DD
Power supply of the control circuits. Also provides the charging current of the external capacitor during start-up.
The functions of this pin are managed by four threshold voltages:
- VDDon: Voltage value at which the device starts switching (Typically 11.5 V).
- VDDoff: Voltage value at which the device stops switching (Typically 8.4 V).
- VDDovp: Triggering voltage of the overvoltage protection (Trimmed to 18 V).
SOURCE Power MOSFET source and circuit ground reference.
DRAIN
COMP
Power MOSFET drain. Also used by the internal high voltage current source during the start-up phase, to charge the external V
DD
capacitor.
Allows the setting of the dynamic characteristic of the converter through an external passive network. The useful voltage range extends from 0.5V to 4.5V. The Power
MOSFET is always off below 0.5V, and the overload protection is triggered if the voltage exceeds 4.35V. This action is delayed by the timing capacitor connected to the
TOVL pin.
TOVL
OSC
Allows the connection of an external capacitor for delaying the overload protection, which is triggered by a voltage on the COMP pin higher than 4.4V.
Allows the setting of the switching frequency through an external Rt-Ct network.
DocRev1 7/31
