SSL1750 datasheet(22/29 Pages) NXP

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SSL1750_1

Product data sheet

Rev. 01 — 15 September 2008

22 of 29

NXP Semiconductors

SSL1750

SMPS control IC for LED drivers

Pulse width modulator PFC

ton(PFC)

PFC on-time

VVINSENSE = 3.3 V,

VPFCCOMP =Vton(max)(PFC)

3.6

4.5

5.0

µs

VVINSENSE = 0.9 V,

VPFCCOMP =Vton(max)(PFC)

µs

Output voltage sensing PFC (pin VOSENSE)

Vth(ol)(VOSENSE)

open-loop threshold voltage

on pin VOSENSE

0.35

0.40

0.45

Vstart(fb)

ﬂyback start voltage

[2] -

1.72

Vstop(fb)

ﬂyback stop voltage

1.55

1.60

1.65

Vburst(L)

LOW-level burst mode

voltage

1.87

1.92

1.97

Vburst(H)

HIGH-level burst mode

voltage

2.19

2.24

2.29

Vreg(VOSENSE)

regulation voltage on pin

VOSENSE

IO(PFCCOMP) = 0 A

2.475

2.500

2.525

Vovp(VOSENSE)

overvoltage protection

voltage on pin VOSENSE

2.60

2.63

2.67

II(VOSENSE)

input current on pin

VOSENSE

VVOSENSE = 2.5 V

100

Overcurrent protection PFC (pin PFCSENSE)

Vsense(PFC)max

maximum PFC sense

voltage

∆V/∆t = 50 mV/µs

0.49

0.52

0.55

∆V/∆t = 200 mV/µs

0.51

0.54

0.57

tleb(PFC)

PFC leading edge blanking

time

250

310

370

Iprot(PFCSENSE)

protection current on pin

PFCSENSE

−50

−5nA

Soft start, soft stop PFC (pin PFCSENSE)

Istart(soft)PFC

PFC soft start current

−75

−60

−45

µA

Vstart(soft)PFC

PFC soft start voltage

0.46

0.50

0.54

Vstop(soft)PFC

PFC soft stop voltage

0.42

0.45

0.48

Rstart(soft)PFC

PFC soft start resistance

Ω

Oscillator PFC

fsw(PFC)max

maximum PFC switching

frequency

100

125

150

kHz

toff(PFC)min

minimum PFC off-time

1.1

1.4

1.7

µs

Valley switching PFC (pin PFCAUX)

(

∆V/∆t)vrec(PFC)

PFC valley recognition

voltage change with time

1.7

µs

tvrec(PFC)

PFC valley recognition time

VPFCAUX = 1 V peak-peak

[3] -

300

demagnetization to

∆V/∆t = 0

[4] --50

tto(vrec)PFC

PFC valley recognition

time-out time

346

µs

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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