VIPER53EDIP-E datasheet(7/31 Pages) STMICROELECTRONICS

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VIPer53EDIP - E / VIPer53ESP - E

Pin connections and function

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Pin connections and function

Figure 1.

Pin connection (top view)

Figure 2.

Current and voltage conventions

Table 10.

Pin function

Pin Name

Pin Function

VDD

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

Power MOSFET drain. Also used by the internal high voltage current source during

the start-up phase, to charge the external VDD capacitor.

COMP

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

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.

OSC

Allows the setting of the switching frequency through an external Rt-Ct network.

SOURCE

TOVL

COMP

VDD

DRAIN

SOURCE

OSC

VDD

TOVL

OSC

COMP

SOURCE

DRAIN

DIP-8

PowerSO-10

15V

VDD

OSC

DRAIN

SOURCE

COMP

TOVL

OSC

TOVL

COMP

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