SG2525A-SG3525A
ELECTRICAL CHARACTERISTICS
(continued)
Symbol
Parameter
Test Conditions
Min.
PWM COMPARATOR
Minimum Duty-cycle
•
•
*
Maximum Duty-cycle
Input Threshold
Input Bias Current
Soft Start Current
Soft Start Low Level
Shutdown Threshold
V
SD
= 0 V, V
SS
= 0 V
V
SD
= 2.5 V
To outputs, V
SS
= 5.1 V
T
j
= 25
°C
V
SD
= 2.5 V T
j
= 25
°C
I
sink
= 20 mA
I
sink
= 100 mA
Output High Level
Under-Voltage Lockout
I
C
t
r
*
t
f
*
I
s
Collector Leakage
Rise Time
Fall Time
Supply Current
I
source
= 20 mA
I
source
= 100 mA
V
comp
and V
ss
= High
V
C
= 35 V
C
L
= 1 nF, T
j
= 25
°C
C
L
= 1 nF, T
j
= 25
°C
V
i
= 35 V
100
50
14
18
17
6
0.6
25
Zero Duty-cycle
Maximum Duty-cycle
SHUTDOWN SECTION
50
0.4
0.8
0.4
0.2
0.2
1
19
18
7
8
200
600
300
20
100
50
14
80
0.7
1
1
0.5
0.4
2
18
17
6
0.6
25
50
0.4
0.8
0.4
0.2
0.2
1
19
18
7
8
200
600
300
20
80
0.7
1
1
0.5
0.4
2
µA
V
V
mA
µs
V
V
V
V
V
µ
A
ns
ns
mA
45
0.7
49
0.9
3.3
0.05
3.6
1
0
45
0.7
49
0.9
3.3
0.05
3.6
1
0
%
%
V
V
µA
SG2525A
Typ.
Max.
Min.
SG3525A
Typ.
Max.
Unit
Shutdown Input Current V
SD
= 2.5 V
*
Shutdown Delay
Output Low Level
OUTPUT DRIVERS (each output) (V
C
= 20 V)
TOTAL STANDBY CURRENT
* These parameters, although guaranteed over the recommended operating conditions, are not 100 % tested in production.
•
Tested at f
osc
= 40 KHz (R
T
= 3.6 KΩ, C
T
= 10nF, R
D
= 0
Ω).
Approximate oscillator frequency is defined by :
f=
1
C
T
(0.7 R
T
+ 3 R
D
)
.
DC transconductance (g
M
) relates to DC open-loop voltage gain (G
v
) according to the following equation : G
v
= g
M
R
L
whereR
L
is the resistance
from pin 9 to ground. The minimum g
M
specification is used to calculate minimum G
v
when the error amplifier output is loaded.
4/12
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