SC402B
4
Electrical Characteristics (continued)
Parameter
Conditions
Min Typ Max Units
Input Supplies (continued)
VDD Supply Current
ENL , EN/PSV = 0V, no external 5V VDD
3
7
糀
ENL , EN/PSV = 0V, external 5V VDD supply
190 300
EN/PSV = VDD (PSAVE), No load, VFB > 600mV
0.7
mA
VDD = 5V, f
SW
= 250kHz, EN/PSV = floating , no load
(2)
8
VDD = 3V, f
SW
= 250kHz, EN/PSV = floating , no load
(2)
5
FB On-Time Threshold
Static V
IN
and load, T
J
= 0 to +125 癈
0.595 0.6 0.605 V
Static V
IN
and load, T
J
= 40 to +125 癈
0.594 0.6 0.606 V
Frequency Range
Continuous mode operation (FCM)
1000 kHz
Bootstrap Switch Resistance
10
&
Timing
On-Time
Continuous mode operation,
V
IN
= 12V, V
OUT
= 5V, f
SW
= 300kHz, R
TON
= 133k&
999 1110 1220 ns
Minimum On-Time
(2)
80
ns
Minimum Off-Time
(2)
VDD = 5V
250
ns
VDD = 3V
370
Soft-Start
Soft-Start Current
3.0
礎
Soft-Start Voltage
(2)
When V
OUT
reaches regulation
1.5
V
Analog Inputs/Outputs
VOUT Input Resistance
500
k&
Current Sense
Zero-Crossing Detector Threshold
LX - PGND
-3 0 +3 mV
Power Good
Power Good Threshold
Upper limit, V
FB
> internal 600mV reference
+20
%
Lower limit, V
FB
< internal 600mV reference
-10
%
Start-Up Delay Time
(between PWM enable and PGOOD high)
VDD = 5V, C
SS
= 10nF
12
ms
VDD = 3V, C
SS
= 10nF
7
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