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NXP Semiconductors
SSL1750
SMPS control IC for LED drivers
Table 5. Characteristics …continued
Measurement data valid at T amb = 25 ° C; V CC = 20 V; all voltages are measured with respect to ground (pin 2); currents are
positive when ?owing into the IC; unless otherwise speci?ed.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Demagnetization management PFC (pin PFCAUX)
V th(comp)PFCAUX
comparator threshold
? 150
? 100
? 50
mV
voltage on pin PFCAUX
t to(demag)PFC
PFC demagnetization
40
50
60
μ s
time-out time
I prot(PFCAUX)
protection current on pin
V PFCAUX = 50 mV
? 75
-
? 5
nA
PFCAUX
Driver (pin PFCDRIVER)
I src(PFCDRIVER)
source current on pin
V PFCDRIVER = 2 V
-
? 0.5
-
A
PFCDRIVER
I sink(PFCDRIVER)
V O(PFCDRIVER)max
sink current on pin
PFCDRIVER
maximum output voltage on
V PFCDRIVER = 2 V
V PFCDRIVER = 10 V
-
-
-
0.7
1.2
11
-
-
12
A
A
V
pin PFCDRIVER
Overvoltage protection ?yback (pin FBAUX)
I ovp(FBAUX)
overvoltage protection
279
300
321
μ A
current on pin FBAUX
N cy(ovp)
number of overvoltage
6
8
12
protection cycles
Demagnetization management ?yback (pin FBAUX)
V th(comp)FBAUX
comparator threshold
60
80
110
mV
voltage on pin FBAUX
I prot(FBAUX)
protection current on pin
V FBAUX = 50 mV
? 50
-
? 5
nA
FBAUX
V clamp(FBAUX)
t sup(xfmr_ring)
clamp voltage on pin FBAUX I FBAUX = ? 500 μ A
I FBAUX = 500 μ A
transformer ringing
? 1.0
0.5
1.5
? 0.8
0.7
2
? 0.6
0.9
2.5
V
V
μ s
suppression time
Pulse width modulator ?yback
t on(fb)min
t on(fb)max
minimum ?yback on-time
maximum ?yback on-time
-
20
t leb(fb)
25
-
30
ns
μ s
Oscillator ?yback
f sw(fb)max
maximum ?yback switching
100
125
150
kHz
frequency
V start(VCO)FBCTRL
VCO start voltage on pin
1.3
1.5
1.7
V
FBCTRL
V hys(FBCTRL)
hysteresis voltage on pin
-
60
-
mV
FBCTRL
? V VCO(FBCTRL)
VCO voltage difference on
-
? 0.1
-
V
pin FBCTRL
SSL1750_1
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 September 2008
23 of 29
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