SC414/SC424
5
Electrical Characteristics (continued)
Parameter
Conditions
Min  Typ  Max  Units
Input Supplies (continued)
V5V Supply Current
ENL, EN/PSV = 0V , V5V = 5V
3
7
ENL, EN/PSV = 0V , V5V = 3V
2
SC414, EN/PSV = V5V, no load (f
SW
 = 25kHz),
V
FB
 > 750mV
(2)
1
mA
SC424, EN/PSV = V5V, no load, V
FB
 > 750mV
(2)
0.4
V5V = 5V, f
SW
 = 250kHz, EN/PSV = fl oating, no load
(2)
4
V5V = 3V, f
SW
 = 250kHz, EN/PSV = fl oating, no load
(2)
2.5
FB Comparator Threshold
Static V
IN
 and load, 0 to +85 癈, V5V = 3V or 5V   0.744  0.750  0.756   V
Static V
IN
 and load, -40 to +85 癈, V5V = 3V or 5V   0.7425
0.7575   V
Frequency Range
Continuous mode operation
1000
kHz
Minimum f
SW
, (SC414 only), EN/PSV = V5V, no load
25
Bootstrap Switch Resistance
10
?/DIV>
Timing
On-Time
Continuous mode operation,
V
IN
 = 15V, V
OUT
 = 3V, R
TON
 = 300k?/DIV>
1350   1500   1650   ns
V5V < 4.5V
(3)
Minimum On-Time
(2)
80
ns
Minimum Off -Time
(2)
V5V = 5V
320
ns
V5V = 3V
390
Soft-Start
Soft-Start Ramp Time
(2)
1.7
ms
Analog Inputs/Outputs
VOUT Input Resistance
500
k?/DIV>
Current Sense
Zero-Crossing Detector Threshold
LX - PGND, V5V = 3V or 5V
-3    0    +3   mV
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