SSL1750 datasheet(24/29 Pages) NXP

24 / 29 page

SSL1750_1

Product data sheet

Rev. 01 — 15 September 2008

24 of 29

NXP Semiconductors

SSL1750

SMPS control IC for LED drivers

Peak current control ﬂyback (pin FBCTRL)

VFBCTRL

voltage on pin FBCTRL

for maximum ﬂyback peak current

1.85

2.0

2.15

Vto(FBCTRL)

time-out voltage on pin

FBCTRL

enable voltage

2.5

trip voltage

4.2

4.5

4.8

Rint(FBCTRL)

internal resistance on pin

FBCTRL

-3

-k

Ω

IO(FBCTRL)

output current on pin

FBCTRL

VFBCTRL =0V

−1.4

−1.17 −0.93 mA

VFBCTRL =2V

−0.6

−0.5

−0.4

Ito(FBCTRL)

time-out current on pin

FBCTRL

VFBCTRL = 2.6 V

−36

−30

−24

µA

VFBCTRL = 4.1 V

−34.5 −28.5 −22.5 µA

Valley switching ﬂyback (pin HV)

(

∆V/∆t)vrec(fb)

ﬂyback valley recognition

voltage change with time

−75

+75

µs

td(vrec-swon)

valley recognition to

switch-on delay time

[5] -

150

Soft start ﬂyback (pin FBSENSE)

Istart(soft)fb

ﬂyback soft start current

−75

−60

−45

µA

Vstart(soft)fb

ﬂyback soft start voltage

0.43

0.49

0.54

Rstart(soft)fb

ﬂyback soft start resistance

Ω

Overcurrent protection ﬂyback (pin FBSENSE)

Vsense(fb)max

maximum ﬂyback sense

voltage

∆V/∆t = 50 mV/µs

0.49

0.52

0.55

∆V/∆t = 200 mV/µs

0.52

0.55

0.58

tleb(fb)

ﬂyback leading edge

blanking time

255

305

355

Driver (FBDRIVER-pin)

Isrc(FBDRIVER)

source current on pin

FBDRIVER

VFBDRIVER =2V

−0.5

Isink(FBDRIVER)

sink current on pin

FBDRIVER

VFBDRIVER = 2 V

0.7

VFBDRIVER =10V

1.2

VO(FBDRIVER)(max)

maximum output voltage on

pin FBDRIVER

-11

Latch input (pin LATCH)

Vprot(LATCH)

protection voltage on pin

LATCH

1.23

1.25

1.27

IO(LATCH)

output current on pin LATCH Vprot(LATCH) <VLATCH <Voc(LATCH)

−85

−80

−75

µA

Ven(LATCH)

enable voltage on pin

LATCH

at start-up

1.30

1.35

1.40

Vhys(LATCH)

hysteresis voltage on pin

LATCH

Ven(LATCH) − Vprot(LATCH)

100

140

Voc(LATCH)

open-circuit voltage on pin

LATCH

2.9

Table 5.

Characteristics …continued

Measurement data valid at Tamb =25 °C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are

positive when ﬂowing into the IC; unless otherwise speciﬁed.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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