SABRE-LL-I datasheet(44/141 Pages) STMICROELECTRONICS

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Switching regulator controller

SABRE-LL-I

44/141

13.3

Output equivalent circuit

The switching regulator controller output driving stage can be represented with an

equivalent circuit as in the figure below:

Figure 11.

Switching regulator controller output driving equivalent circuit

As can be seen from the above figure, the external switch gate is charged with a current

generator ISOURCE and it is discharged towards ground with a current generator ISINK that is

applied for a TSINK pulse while an equivalent resistor RSUSTAIN is connected between gate

and source until the sink command is present.

The table here below lists the values of the above mentioned parameters:

Table 24.

Switching regulator controller operating specification

Parameter

Description

Test condition

Min

Typ

Max

Unit

ISOURCE

Source current

VPump=VSupply+12V

VSWCTR_GATE=0V

ISINK

Sink current

VSWCTR_GATE = VSupply

tSINK

Sink discharge pulse time

600

RSUSTAIN

Gate-source sustain

resistance

(VSWCTR_GATE - VSWCTR_SRC)

= 0.2V

650

Ω

VSWDRV_gate

VPUMP

ISOURCE

VSWDRV_SW

RSUSTAIN

Source command

Sink pulse command

ISINK

Sink command

Tsink

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