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SG3525ADWR2 Datasheet(PDF) 3 Page - ON Semiconductor

Part # SG3525ADWR2
Description  Pulse Width Modulator Control Circuit
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

SG3525ADWR2 Datasheet(HTML) 3 Page - ON Semiconductor

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SG3525A
http://onsemi.com
3
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Supply Voltage
VCC
+40
Vdc
Collector Supply Voltage
VC
+40
Vdc
Logic Inputs
−0.3 to +5.5
V
Analog Inputs
−0.3 to VCC
V
Output Current, Source or Sink
IO
±500
mA
Reference Output Current
Iref
50
mA
Oscillator Charging Current
5.0
mA
Power Dissipation
TA = +25°C (Note 1)
TC = +25°C (Note 2)
PD
1000
2000
mW
Thermal Resistance, Junction−to−Air
RqJA
100
°C/W
Thermal Resistance, Junction−to−Case
RqJC
60
°C/W
Operating Junction Temperature
TJ
+150
°C
Storage Temperature Range
Tstg
−55 to +125
°C
Lead Temperature (Soldering, 10 seconds)
TSolder
+300
°C
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
Symbol
Min
Max
Unit
Supply Voltage
VCC
8.0
35
Vdc
Collector Supply Voltage
VC
4.5
35
Vdc
Output Sink/Source Current
(Steady State)
(Peak)
IO
0
0
±100
±400
mA
Reference Load Current
Iref
0
20
mA
Oscillator Frequency Range
fosc
0.1
400
kHz
Oscillator Timing Resistor
RT
2.0
150
k
W
Oscillator Timing Capacitor
CT
0.001
0.2
mF
Deadtime Resistor Range
RD
0
500
W
Operating Ambient Temperature Range
TA
0
+70
°C
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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