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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 V 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 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.
Block Diagram
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
Following are the high reliability features of SG1525A
and SG1527A:
Available to MIL-STD-883, ¶ 1.2.1
MIL-M38510/12602BEA - JAN1525AJ
MIL-M38510/12604BEA - JAN1527AJ
MSC-AMS level SProcessing Available
+VIN
GROUND
SYNC
RT
CT
DISCHARGE
COMPENSATION
INV. INPUT
N.I. INPUT
SOFT-SART
SHUTDOWN
VREF
REFERENCE
REGULATOR
U.V.
LOCKOUT
TO
INTERNAL CIRCUITRY
OSC OUTPUT
OSCILLATOR
Q
Q
F/F
P.W.M.
R
+S
LATCH
VIN
+
ERROR
AMP
5k
50µA
VREF
5k
VC
OUTPUT A
OUTPUT B
SG1525A OUTPUT STAGE
VC
OUTPUT A
OUTPUT B
SG1527A OUTPUT STAGE
Figure 1 · Block Diagram
September 2014 Rev. 1.4a
www.microsemi.com
© 2014 Microsemi Corporation
1
Page 1

Regulating Pulse Width Modulator
Connection Diagrams and Ordering Information
Ambient
Temperature
-55°C to
125°C
-25°C to 85°C
-0°C to 70°C
-25°C to 85°C
-0°C to 70°C
-25°C to 85°C
-0°C to 70°C
Type Package
J 16-PIN
ceramic DIP
N 16-PIN
plastic DIP
16-pin wide
DW body
plastic
SOIC
Part Number
SG1525AJ-883B
SG1525AJ-JAN
SG1525AJ-DESC
SG1525AJ
SG1527AJ-883B
SG1527AJ-JAN
SG1527AJ-DESC
SG1527AJ
SG2525AJ
SG2527AJ
SG3525AJ
SG3527AJ
SG2525AN
SG2527AN
SG3525AN
SG3527AN
SG2525ADW
SG2527ADW
SG3525ADW
SG3527ADW
Packaging
Type
CERDIP
PDIP
SOIC
Connection Diagram
INV. Input
N.I. Input
SYNC
OSC. Output
CT
RT
Discharge
Soft-start
1
2
3
4
5
6
7
8
16 VREF
15 +VIN
14 Output B
13 VC
12 Ground
11 Output A
10 Shutdown
9 Compensation
N Package: RoHS Compliant / Pb-free
Transition DC: 0503
N Package: RoHS / Pb-free 100%
Matte Tin Lead Finish
INV. Input
N.I. Input
SYNC
OSC. Output
CT
RT
Discharge
Soft-start
1
2
3
4
5
6
7
8
16 VREF
15 +VIN
14 Output B
13 VC
12 Ground
11 Output A
10 Shutdown
9 Compensation
DW Package: RoHS Compliant / Pb-
free Transition DC: 0516
DW Package: RoHS / Pb-free 100%
Matte Tin Lead Finish
-55°C to
125°C
SG1525AL-883B
20-pin
ceramic
SG1525AL
L leadless SG1527AL-883B
chip carrier
(LCC)
SG1527AL
CLCC
1. N.C.
2. INV. Input
3. N.I. Input
4. SYNC
5. OSC. Output
6. N.C.
7. C T
8. R T
9. Discharge
10. Soft-start
4
5
6
7
8
3 2 1 20 19
9 10 11 12 13
11. N.C.
12. Comp
18 13. Shutdown
17 14. Output A
15. Ground
16 16. N.C.
15 17. VC
14 18. Output B
19. +VIN
20. VREF
Notes:
1. Contact factory for JAN and DESC product availability.
2. All packages are viewed from the top.
3. Hermetic Packages J & L use Sn63Pb37 hot solder dip lead finish, contact factory for availability of RoHS compliant
versions.
2
Page 2

Absolute Maximum Ratings1
Parameter
Supply Voltage (+VIN)
Collector Supply Voltage (VC)
Logic Inputs
Analog Inputs
Output Current, Source or Sink
Reference Load Current
Oscillator Charging Current
Operating Junction Temperature
Hermetic (J, L Packages)
Plastic (N, DW Packages)
Storage Temperature Range
Lead Temperature (Soldering, 10 seconds)
RoHS Peak Package Solder Reflow Temp. (40 s max. exp.)
Note: Values beyond which damage may occur
Absolute Maximum Ratings1
Value
40
40
-0.3 to 5.5
-0.3 to VIN
500
50
5
150
150
-65 to 150
300
260 (+0, -5)
Units
V
V
V
V
mA
mA
mA
°C
°C
°C
°C
°C
Thermal Data
Parameter
Value
Units
J Package
Thermal Resistance-Junction to Case, θJC
Thermal Resistance-Junction to Ambient, θJA
30 °C/W
80 °C/W
N Package
Thermal Resistance-Junction to Case, θJC
Thermal Resistance-Junction to Ambient, θJA
40 °C/W
65 °C/W
DW Package
Thermal Resistance-Junction to Case, θJC
Thermal Resistance-Junction to Ambient, θJA
40 °C/W
95 °C/W
L Package
Thermal Resistance-Junction to Case, θJC
35 °C/W
Thermal Resistance-Junction to Ambient, θJA
120 °C/W
Notes:
1. Junction Temperature Calculation: TJ = TA + (PD × θJA).
2. The above numbers for θJC are maximums for the limiting thermal resistance of the package in a standard mounting
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.
3
Page 3
Part Number SG3525A
Manufactur Microsemi Corporation
Description REGULATING PULSE WIDTH MODULATOR
Total Page 13 Pages
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