SG3525A SG3527A
MAXIMUM RATINGS
(Note 1)
Rating
Supply Voltage
Collector Supply Voltage
Logic Inputs
Analog Inputs
Output Current, Source or Sink
Reference Output Current
Oscillator Charging Current
Power Dissipation (Plastic & Ceramic Package)
TA = +25°C (Note 2)
TC = +25°C (Note 3)
Thermal Resistance Junction–to–Air
Thermal Resistance Junction–to–Case
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10 seconds)
PD
1000
2000
R
θJA
R
θJC
TJ
Tstg
TSolder
100
60
+150
–55 to +125
+300
°C/W
°C/W
°C
°C
°C
IO
Iref
Symbol
VCC
VC
Value
+40
+40
–0.3 to +5.5
–0.3 to VCC
±500
50
5.0
Unit
Vdc
Vdc
V
V
mA
mA
mA
mW
NOTES:
1. Values beyond which damage may occur.
2. Derate at 10 mW/°C for ambient temperatures above +50°C.
3. 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
VCC
VC
IO
0
0
Iref
fosc
RT
CT
RD
TA
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
kΩ
µF
Ω
°C
Unit
Vdc
Vdc
mA
APPLICATION INFORMATION
Shutdown Options
(See Block diagram, front page)
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
µA
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
µA
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.
2
MOTOROLA ANALOG IC DEVICE DATA
MOTOROLA [ MOTOROLA, INC ]
