SSL3250A datasheet(21/26 Pages) NXP

21 / 26 page

SSL3250A_3

Product data sheet

Rev. 03 — 30 June 2009

21 of 26

NXP Semiconductors

SSL3250A

Photo ﬂash dual LED driver

High power LED parameters

output voltage

on pin VO

[6] -

9.5

ILED

LED current

IF_SEL = 0;

current control register = 08h;

STRB = 0

IF_SEL = 0;

current control register = 30h;

STRB = 0

106

125

144

IF_SEL = 0;

current control register = C0h;

STRB = 1

356

395

435

IF_SEL = 0;

current control register = F8h;

STRB = 1

450

500

550

default ﬂash current;

IF_SEL = 1; EN1 = 1; EN2 = 1;

R_FL = High

[3] 450

500

550

default torch current;

IF_SEL = 1; EN1 = 0; EN2 = 1;

R_TR = High

[3] 106

125

144

Ileak(LED)

leakage current on pin LED

ACT = 0; Shut-down mode

0.5

µA

VLED

voltage on pin LED

boost mode; ILED = 0.5 A

[7] -

300

follower mode

[7] 350

Vovp

overvoltage protection voltage

9.8

10.5

11.0

Indicator LED parameters

II_IND

current on pin I_IND

IF_SEL = 0 (I2C)

2.5

17.5

IF_SEL = 1 (direct enable)

2.5

default indicator current;

IF_SEL = 1; EN1 = 1; EN2 = 0;

R_IND = High

-10

∆II_IND

current variation on pin I_IND

Ileak(I_IND)

leakage current on pin I_IND

ACT = 0; Shut-down mode

µA

Power MOSFET

RDSon

drain-source on-state resistance

NFET

200

425

Timing

fsw

switching frequency

1.08

1.2

1.32

MHz

δmax

maximum duty cycle

tstart(soft)

soft start time

ACT = 0 to ACT = 1

response time

160

400

tto(acc)

accuracy of time-out time

the absolute value can be

set with I2C

Table 9.

Characteristics …continued

VI = 3.0 V to 5.5 V; Tamb = −40 °C to +85 °C, unless otherwise speciﬁed.

Symbol

Parameter

Conditions

Min

Typ[1]

Max

Unit

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