SG3525A
MAXIMUM RATINGS
Rating
Supply Voltage
Collector Supply Voltage
Logic Inputs
Analog Inputs
Output Current, Source or Sink
Reference Output Current
Oscillator Charging Current
Power Dissipation
T
A
= +25°C (Note 1)
T
C
= +25°C (Note 2)
Thermal Resistance, Junction−to−Air
Thermal Resistance, Junction−to−Case
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10 seconds)
P
D
1000
2000
R
qJA
R
qJC
T
J
T
stg
T
Solder
100
60
+150
−55 to +125
+300
°C/W
°C/W
°C
°C
°C
I
O
I
ref
Symbol
V
CC
V
C
Value
+40
+40
−0.3 to +5.5
−0.3 to V
CC
±500
50
5.0
Unit
Vdc
Vdc
V
V
mA
mA
mA
mW
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. Derate at 10 mW/°C for ambient temperatures above +50°C.
2. Derate at 16 mW/°C for case temperatures above +25°C.
RECOMMENDED OPERATING CONDITIONS
Characteristics
Supply Voltage
Collector Supply Voltage
Output Sink/Source Current
(Steady State)
(Peak)
Reference Load Current
Oscillator Frequency Range
Oscillator Timing Resistor
Oscillator Timing Capacitor
Deadtime Resistor Range
Operating Ambient Temperature Range
Symbol
V
CC
V
C
I
O
0
0
I
ref
f
osc
R
T
C
T
R
D
T
A
0
0.1
2.0
0.001
0
0
Min
8.0
4.5
Max
35
35
±100
±400
20
400
150
0.2
500
+70
mA
kHz
kW
mF
W
°C
Unit
Vdc
Vdc
mA
APPLICATION INFORMATION
Shutdown Options
(See Block Diagram, page 2)
Since both the compensation and soft−start terminals
(Pins 9 and 8) have current source pull−ups, either can
readily accept a pull−down signal which only has to sink a
maximum of 100
mA
to turn off the outputs. This is subject
to the added requirement of discharging whatever external
capacitance may be attached to these pins.
An alternate approach is the use of the shutdown circuitry
of Pin 10 which has been improved to enhance the available
shutdown options. Activating this circuit by applying a
positive signal on Pin 10 performs two functions: the PWM
latch is immediately set providing the fastest turn−off signal
to the outputs; and a 150
mA
current sink begins to discharge
the external soft−start capacitor. If the shutdown command
is short, the PWM signal is terminated without significant
discharge of the soft−start capacitor, thus, allowing, for
example, a convenient implementation of pulse−by−pulse
current limiting. Holding Pin 10 high for a longer duration,
however, will ultimately discharge this external capacitor,
recycling slow turn−on upon release.
Pin 10 should not be left floating as noise pickup could
conceivably interrupt normal operation.
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