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Microsemi Corporation
Microsemi Corporation

SG3525A Datasheet

REGULATING PULSE WIDTH MODULATOR


SG3525A Datasheet Preview


SG1525A/SG2525A/SG3525A
SG1527A/SG2527A/SG3527A
REGULATING PULSE WIDTH MODULATOR
DESCRIPTION
The SG1525A/1527A series of pulse width modulator integrated circuits are
designed to offer improved performance and lower external parts count when used
to implement all types of switching power supplies. The on-chip +5.1 volt reference
is trimmed to ±1% initial accuracy and the input common-mode range of the error
amplifier includes the reference voltage, eliminating external potentiometers and
divider resistors. A Sync input to the oscillator allows multiple units to be slaved
together, or a single unit to be synchronized to an external system clock. A single
resistor between the CT pin and the Discharge pin provides a wide range of deadtime
adjustment. These devices also feature built-in soft-start circuitry with only a timing
capacitor required externally. A Shutdown pin controls both the soft-start circuitry
and the output stages, providing instantaneous turn-off with soft-start recycle for
slow turn-on. These functions are also controlled by an undervoltage lockout which
keeps the outputs off and the soft-start capacitor discharged for input voltages less
than that required for normal operation. Another unique feature of these PWM
circuits is a latch following the comparator. Once a PWM pulse has been terminated
for any reason, the outputs will remain off for the duration of the period. The latch
is reset with each clock pulse. The output stages are totem-pole designs capable
of sourcing or sinking in excess of 200mA. The SG1525A output stage features
NOR logic, giving a LOW output for an OFF state. The SG1527A utilizes OR logic
which results in a HIGH output level when OFF.
FEATURES
8V to 35V operation
5.1V reference trimmed to ±1%
100Hz to 500KHz oscillator range
Separate oscillator sync terminal
Adjustable deadtime control
Internal soft-start
Input undervoltage lockout
Latching P.W.M. to prevent multiple
pulses
Dual source/sink output drivers
HIGH RELIABILITY FEATURES
- SG1525A, SG1527A
Available to MIL-STD-883B
MIL-M38510/12602BEA - JAN1525AJ
MIL-M38510/12604BEA - JAN1527AJ
Radiation data available
LMI level "S" processing available
BLOCK DIAGRAM
11/91 Rev 1.3 10/96
Copyright © 1996
LINFINITY Microelectronics Inc.
1 11861 Western Avenue Garden Grove, CA 92841
(714) 898-8121 FAX: (714) 893-2570
Page 1

SG1525A/SG1527A SERIES
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (+V ) ....................................................... 40V
IN
Collector Supply Voltage (VC) ........................................... 40V
Logic Inputs ....................................................... -0.3V to 5.5V
Analog Inputs ....................................................... -0.3V to V
IN
Output Current, Source or Sink ................................... 500mA
Reference Load Current ............................................... 50mA
Note 1. Values beyond which damage may occur.
Oscillator Charging Current ............................................ 5mA
Operating Junction Temperature Range
Hermetic (J, L Packages) ..................................... 150°C
Plastic (N, DW Packages ) ....................................... 150°C
Storage Temperature Range .......................... -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ................. 300°C
THERMAL DATA
J Package:
Thermal Resistance-Junction to Case, θJC .................. 30°C/W
Thermal Resistance-Junction to Ambient, θJA .............. 80°C/W
DW Package:
Thermal Resistance-Junction to Case, θJC .................. 40°C/W
Thermal Resistance-Junction to Ambient, θJA ............. 95°C/W
L Package:
Thermal Resistance-Junction to Case, θJC .................. 35°C/W
Thermal Resistance-Junction to Ambient, θJA ........... 120°C/W
N Package:
Thermal Resistance-Junction to Case, θJC ................... 40°C/W
Thermal Resistance-Junction to Ambient, θJA ............. 65°C/W
Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).
Note B. The above numbers for θJC are maximums for the limiting
thermal resistance of the package in a standard mount-
ing configuration. The θJA numbers are meant to be
guidelines for the thermal performance of the device/pc-
board system. All of the above assume no ambient
airflow.
RECOMMENDED OPERATING CONDITIONS (Note 2)
Input Voltage (+VIN) ................................................ 8V to 35V
Collector Voltage (VC) .......................................... 4.5V to 35V
Sink/Source Load Current (steady state) ............. 0 to 100mA
Sink/Source Load Current (peak) ......................... 0 to 400mA
Reference Load Current ........................................ 0 to 20mA
Oscillator Frequency Range ....................... 100Hz to 350KHz
Oscillator Timing Resistor (RT) ........................ 2Kto 150K
Note 2: Range over which the device is functional.
Deadtime Resistor Range (RD) ............................. 0to 500
Maximum Shutdown Source Impedance ......................... 5K
Oscillator Timing Capacitor (C ) ...................
T
0.001µF to 0.1µF
Operating Ambient Temperature Range
SG1525A/SG1527A .................................... -55°C to 125°C
SG2525A/SG2527A ...................................... -25°C to 85°C
SG3525A/SG3527A ......................................... 0°C to 70°C
ELECTRICAL CHARACTERISTICS
(Unless
otherwise
specified,
these
specifications
apply
over
the
operating
ambient
temperatures
for
SG1525A/SG1527A
with
-55°C
T
A
125°C,
SG2525A/SG2527A with -25°C TA 85°C, SG3525A/SG3527A with 0°C TA 70°C, and +VIN = 20V. Low duty cycle pulse testing techniques are
used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter
Test Conditions
Reference Section
Output Voltage
Line Regulation
Load Regulation
Temperature Stability (Note 3)
T
J
=
25°C
VIN = 8V to 35V
IL = 0 to 20mA
Over Operating Temperature Range
Total Output Voltage Range (Note 3) Over Line, Load and Temperature
Short Circuit Current
Output Noise Voltage (Note 3)
Long Term Stability (Note 3)
VREF = 0V, TJ = 25°C
10Hz
f
10KHz,
T
J
=
25°C
TJ = 125°C
SG1525A/2525A
SG1527A/2527A
SG3525A
SG3527A
Units
Min. Typ. Max. Min. Typ. Max.
5.05 5.10 5.15 5.00 5.10 5.20 V
10 30
10 30 mV
20 50
20 50 mV
20 50
20 50 mV
5.00 5.20 4.95 5.25 V
80 100
80 100 mA
40 200
40 200 µVrms
20 50
20 50 mV/khr
Note 3. These parameters, although guaranteed over the recommended operating conditions, are not 100% tested in production.
Note 4. FOSC = 40KHz (RT = 3.6K, CT = 0.01µF, RD = 0)
Note 5. Applies to SG1525A/2525A/3525A only, due to polarity of output pulses.
11/91 Rev 1.3 10/96
Copyright © 1996
LINFINITY Microelectronics Inc.
2 11861 Western Avenue Garden Grove, CA 92841
(714) 898-8121 FAX: (714) 893-2570
Page 2

ELECTRICAL CHARACTERISTICS (continued)
Parameter
Test Conditions
Oscillator Section (Note 4)
Initial Accuracy
Voltage Stability
Temperature Stability (Note 3)
Minimum Frequency (Note 3)
Maximum Frequency (Note 3)
Current Mirror
Clock Amplitude
Clock Width
Sync Threshold
Sync Input Current
TJ = 25°C
VIN = 8V to 35V
MIN
T
J
MAX
RT = 150K, CT = 0.1µF
RT = 2K, CT = 1nF
I = 2mA
RT
TJ = 25°C
Sync Voltage = 3.5V
Error Amplifier Section (VCM = 5.1V)
Input Offset Voltage
Input Bias Current
Input Offset Current
DC Open Loop Gain
Gain-Bandwidth Product (Note 3)
Output Low Level
RL 10MΩ, TJ = 25°C
A
V
=
0dB,
T
J
=
25°C
Output High Level
Common Mode Rejection
Supply Voltage Rejection
P.W.M. Comparator Section
V = 1.5V to 5.2V
CM
VIN = 8V to 35V
Minimum Duty Cycle
Maximum Duty Cycle
Input Threshold (Note 4)
VCOMP = 0.6V
V = 3.6V
COMP
Zero Duty Cycle
Maximum Duty Cycle
Input Bias Current
Soft-Start Section
Soft Start Current
Soft Start Voltage
Shutdown Input Current
VSHUTDOWN = 0V
VSHUTDOWN = 2V
V = 2.5V
SHUTDOWN
Output Drivers Section (each transistor, VC = 20V)
Output High Level
Output Low Level
Undervoltage Lockout
Collector Leakage (Note 5)
Rise Time
Fall Time
Shutdown Delay (Note 3)
ISOURCE = 20mA
ISOURCE = 100mA
I = 20mA
SINK
ISINK = 100mA
VCOMP and VSS = High
V = 35V
C
CL = 1nF, TJ = 25°C
CL = 1nF, TJ = 25°C
V
SD
=
3V,
C
S
=
0,
T
J
=
25°C
Total Standby Current
Standby Current
VIN = 35V
SG1525A/SG1527A SERIES
SG1525A/2525A
SG1527A/2527A
SG3525A
SG3527A
Units
Min. Typ. Max. Min. Typ. Max.
37.6 40 42.4 37.6 40 42.4 KHz
±0.3 ±1
±1 ±2 %
±3 ±6
±3 ±6 %
150 150 Hz
350 350
KHz
1.7 2.0 2.2 1.7 2.0 2.2 mA
3.0 3.5
3.0 3.5
V
0.3 0.5 1.0 0.3 0.5 1.0 µs
1.2 2.0 2.8 1.2 2.0 2.8 V
1.0 2.5
1.0 2.5 mA
0.5 5
2 10 mV
1 10
1 10 µA
1 1 µA
60 75
60 75
dB
12
12
MHz
0.2 0.5
0.2 0.5 V
3.8 5.6
3.8 5.6
V
60 75
60 75
dB
50 60
50 60
dB
00
45 49
45 49
0.6 0.9
0.6 0.9
3.3 3.6
3.3 3.6
.05 2.0
.05 2.0
%
%
V
V
µA
25 50 80 25 50 80
0.4 0.6
0.4 0.6
0.4 1.0
0.4 1.0
µA
V
mA
18 19
18 19
17 18
17 18
0.2 0.4
0.2 0.4
1.0 2.2
1.0 2.2
678678
200 200
100 600
100 600
50 300
50 300
0.2 0.5
0.2 0.5
V
V
V
V
V
µA
ns
ns
µs
14 20
14 20 mA
11/91 Rev 1.3 10/96
Copyright © 1996
LINFINITY Microelectronics Inc.
3 11861 Western Avenue Garden Grove, CA 92841
(714) 898-8121 FAX: (714) 893-2570
Page 3

OSCILLATOR SECTION
SG1525A/SG1527A SERIES
FIGURE 1 - OSCILLATOR SCHEMATIC
FIGURE 2 - OSCILLATOR CHARGE TIME VS. RT AND CT
ERROR AMPLIFIER SECTION
FIGURE 3 - OSCILLATOR DISCHARGE TIME VS. RD AND CT
FIGURE 4 - ERROR AMPLIFIER
11/91 Rev 1.3 10/96
Copyright © 1996
FIGURE 5 - ERROR AMPLIFIER OPEN-LOOP
FREQUENCY RESPONSE
LINFINITY Microelectronics Inc.
4 11861 Western Avenue Garden Grove, CA 92841
(714) 898-8121 FAX: (714) 893-2570
Page 4
Part Number SG3525A
Manufactur Microsemi Corporation
Description REGULATING PULSE WIDTH MODULATOR
Total Page 7 Pages
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