Datasheet

ELECTRICAL CHARACTERISTICS
(continued)
Symbol Parameter Test Conditions
SG2525A SG3525A
Unit
Min. Typ. Max. Min. Typ. Max.
PWM COMPARATOR
Minimum Duty-cycle 0 0 %
• Maximum Duty-cycle 45 49 45 49 %
• Input Threshold Zero Duty-cycle 0.7 0.9 0.7 0.9 V
Maximum Duty-cycle 3.3 3.6 3.3 3.6 V
* Input Bias Current 0.05 1 0.05 1 µA
SHUTDOWN SECTION
Soft Start Current V
SD
= 0 V, V
SS
= 0 V 255080255080 µA
Soft Start Low Level V
SD
= 2.5 V 0.4 0.7 0.4 0.7 V
Shutdown Threshold To outputs, V
SS
= 5.1 V
T
j
= 25 °C
0.6 0.8 1 0.6 0.8 1 V
Shutdown Input Current V
SD
= 2.5 V 0.4 1 0.4 1 mA
* Shutdown Delay V
SD
= 2.5 V T
j
= 25 °C 0.2 0.5 0.2 0.5 µs
OUTPUT DRIVERS (each output) (V
C
= 20 V)
Output Low Level I
sink
= 20 mA 0.2 0.4 0.2 0.4 V
I
sink
= 100 mA 1 2 1 2 V
Output High Level I
source
= 20 mA 18 19 18 19 V
I
source
= 100 mA 17 18 17 18 V
Under-Voltage Lockout V
comp
and V
ss
= High 678678 V
I
C
Collector Leakage V
C
= 35 V 200 200 µA
t
r
* Rise Time C
L
= 1 nF, T
j
= 25 °C 100 600 100 600 ns
t
f
* Fall Time C
L
= 1 nF, T
j
= 25 °C 50 300 50 300 ns
TOTAL STANDBY CURRENT
I
s
Supply Current V
i
= 35 V 14 20 14 20 mA
*
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 K
Ω
, C
T
= 10nF, R
D
= 0
Ω
). Approximate oscillator frequency is defined by :
1
f =
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
where R
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.
SG2525A-SG3525A
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