Pin connections and functions

SRK2001A

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DocID029495 Rev 1

2

Pin connections and functions

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

clamped to about 11 V. 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 of 100

.

9PROG

Programming pin for conduction duty-cycle at burst-mode exiting. A resistor

connected from this pin to GND, supplied by an internal precise current source, sets a

can choose, according to the application requirements, the proper burst-mode exiting

conduction duty-cycle among the ones contained in an internal lookup table which

values are reported in Table 6: Burst-mode exiting lookup table on page 15 (the

values are predefined inside the table). For the proper choice of the resistor value see

Table 5: Electrical characteristics.

10

EN

Enable pin function with internal pull-up (remote ON/OFF): during the run mode, when

operating and enters a low consumption state; it resumes the operation if the pin