SABRE-LL-I datasheet(72/141 Pages) STMICROELECTRONICS

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Power bridges

SABRE-LL-I

72/141

In pulse skipping control PWM the duty cycle must be decided by the user depending on

supply voltage and regulated voltage.

Therefore the switching regulator has 4 possible PWM duty cycles that can be changed

writing in the Aux3PWMTable[1:0] bits in the Aux3SwCfg1 register according to the

following table.

Adjustable duty cycles can be changed using a metal layer change in order to adapt it to

customer system. The only limitation is that ALL regulators share the same duty cycle bus,

so any modification must consider ALL regulators needed duty cycles.

AUX3 Control loop parameters specifications

The following table assumes that DC4_PLUS and DC4_MINUS pins are externally shorted

together.

Table 49.

Battery charger regulator controller PWM specification

Aux3PWMTable [1:0]

Typical duty cycle value

Comments

10%

13%

24%

Default state

61%

Table 50.

Battery charger operating specification

Parameter

Description

Test condition

Min

Typ

Max

Unit

VAUX_SW

Output pin voltage

range

(1)

-1

VSupply

Output leakage

current

Tjunction = 125°C

-100

+100

µA

IQlp

Output leakage

current in

“Low Power Mode”

VSupply = 36V

Tjunction = 125°C

-20

+20

µA

IQfb

GPIo feedback pin

current

Tjunction = 125°C

0V=Feedback=3V

-10

+10

µA

Vout

Output voltage range

VSupply = 36V

(2)

1.412

Iload

Output load current

VSupply = 36V

0.002

RonH

Internal high/low side

RDson

Tjunction = 125°C

Iload=1.5A

0.4

Ω

Vloop

Loop voltage

accuracy

±3%

VregR

Output voltage ripple

(RMS)

L = TBD, C =

TBD,ESR=TBD m

Ω(3)

TBD

mVRMS

VuvFall

Under voltage falling

threshold

(4)

84.5

89.5

VuvRise

Under voltage rising

threshold

(4)

90.5

95.5

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