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AS998/AS998A
PWM Controller
Over Current Comparator
Parameter
Symbol
Test Condition
Min.
Typ.
Max.
Unit
Comparator Threshold
VCSTH
COMP = 1V, FB = 3V
1.25
V
Propagation Delay to Output
tpd2
FB = 2, Vcs step to 1.65V, from 50%
100
150
ns
point on CSNS input to 90% point on
output H to L transistion
Over Voltage Input
Parameter
Symbol
Test Condition
Min.
Typ.
Max.
Unit
OV VDD Threshold
VDDOV
Forcing VDD pin
13
14
14.7
V
OV Threshold
VOV
Forcing OV pin
3.5
V
OV Latch State Low
OVRN
OV = Reg - 1V, Equiv. R to Reg
4
8
16
k
Ω
OV Latch State High
OVRP
OV = 1V, Equiv. R to Gnd
4
8
16
k
Ω
OV Hi Impedance Pull-up
OVHI
OV = 1V, IDD = 10mA
0.3
1
µA
OV Unlatch Threshold
VDDUL
VDD dropped until latch fails
4.75
5
5.25
V
Output
Parameter
Symbol
Test Condition
Min.
Typ.
Max.
Unit
Max. “Off State” Voltage
VOFF
IOUT = 100µA
1.7
V
Output Rise Time
tr
T = 25°C, 10% - 90%
170
250
290
ns
Output Fall Time
tf
T = 25°C, 10% - 90%
140
210
240
ns
Electrical Characteristics (cont.)
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