Block diagrams and pin connections

SRK2001

4/22

DocID027367 Rev 3

Figure 3. Pin connections (top view)

Table 2. Pin functions

No. Name

Function

1VCC

Supply voltage of the device. A bypass capacitor to GND, located as close to IC's pins as possible,

helps to get a clean supply voltage for the internal control circuitry and acts as an effective energy

buffer for the pulsed gate drive currents.

2GND

Return of the device bias current and return of the gate drive currents. Route this pin to the common

point where the source terminals of both synchronous rectifier MOSFETs are connected.

3

(8)

GD1

(GD2)

Gate driver output for section 1 (2). Each totem pole output stage is able to drive power MOSFETs

with high peak current levels. To avoid excessive gate voltages in case the device is supplied with

depending on the selected part number, to allow for the proper driving of standard or logic level

MOSFETs. The pin has to be connected directly to the SR MOSFET gate terminal.

4

(7)

SVS1

(SVS2)

Source voltage sensing for section 1 (2): it is the reference voltage of the corresponding drain

sensing signal on the DVS1, 2 pin. These pins have to be connected directly to the respective source

terminals of the corresponding synchronous rectifier MOSFET.

5

(6)

DVS1

(DVS2)

Drain voltage sensing for section 1 (2). These pins have to be connected to the respective drain

terminals of the corresponding synchronous rectifier MOSFET using a series resistor at least of

100

.

9PROG

Programming pin for conduction duty cycle at sleep mode entering/exiting. A resistor connected from

this voltage level, during the startup phase, the user can chose, according to the application

requirements, the proper sleep mode or burst mode exiting the conduction duty cycle among the

ones contained into two internal lookup tables (the values are predefined inside Table 6 on page 15,

Table 7 on page 16 and Table 8 on page 16). See Table 5 or the proper choice of resistor value.

10

EN

Enable pin function with internal pull-up and current source capability:

– Automatic sleep mode function enable/disable: the sleep mode is disabled if the pin voltage is

– Remote ON/OFF: during run the mode, when the pin voltage is sensed below the internal

– During the startup phase, the pin voltage level allows to select the predefined conduction duty

cycle for sleep mode entering. A resistor connected from this pin to GND, supplied by an internal

precise current source allows the user for this choice (two predefined values). See the Table 5 for

the proper choice of resistor value.