VIPER53ESP-E Ver la hoja de datos (PDF) - STMicroelectronics
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VIPER53ESP-E Datasheet PDF : 31 Pages
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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
DRAIN
NC
1
10
NC
2
9
NC
3
8
VDD
4
7
TOVL
5
6
DIP-8
PowerSO-10
Figure 2. Current and voltage conventions
IDD
ID
SOURCE
NC
NC
OSC
COMP
VDD
DRAIN
IOSC
OSC
15V
VDS
VDD
TOVL
COMP SOURCE
VOSC
ITOVL
VTOVL
ICOMP
VCOMP
Table 10. Pin function
Pin Name
Pin Function
VDD
SOURCE
DRAIN
COMP
TOVL
OSC
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).
Power MOSFET source and circuit ground reference.
Power MOSFET drain. Also used by the internal high voltage current source during
the start-up phase, to charge the external VDD 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.
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.
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