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  Microsemi Electronic Components Datasheet  

SG3526 Datasheet

REGULATING PULSE WIDTH MODULATOR

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SG1526/SG2526/SG3526
REGULATING PULSE WIDTH MODULATOR
DESCRIPTION
The SG1526 is a high-performance monolithic pulse width
modulator circuit designed for fixed-frequency switching
regulators and other power control applications. Included
in an 18-pin dual-in-line package are a temperature
compensated voltage reference, sawtooth oscillator, error
amplifier, pulse width modulator, pulse metering and
steering logic, and two low impedance power drivers. Also
included are protective features such as soft-start and
undervoltage lockout, digital current limiting, double pulse
inhibit, a data latch for single pulse metering, adjustable
deadtime, and provision for symmetry correction inputs.
For ease of interface, all digital control ports are TTL and
B-series CMOS compatible. Active LOW logic design
allows wired-OR connections for maximum flexibility. This
versatile device can be used to implement single-ended or
push-pull switching regulators of either polarity, both
transformerless and transformer coupled. The SG1526 is
characterized for operation over the full military ambient
junction temperature range of -55°C to +150°C. The
SG2526 is characterized for operation from -25°C to
+150°C, and the SG3526 is characterized for operation
from 0°C to +125°C.
BLOCK DIAGRAM
VREF
FEATURES
8V to 35V Operation
5V Reference Trimmed to ±1%
1Hz to 350kHz Oscillator Range
Dual 100mA Source/Sink Outputs
Digital Current Limiting
Double Pulse Suppression
Programmable Deadtime
Undervoltage Lockout
Single Pulse Metering
Programmable Soft-start
Wide Current Limit Common Mode
Range TTL/CMOS Compatible Logic
Ports Symmetry Correction Capability
Guaranteed 6 Unit Synchronization
HIGH RELIABILITY FEATURES
Available to MIL-STD-883, ¶ 1.2.1
Available to DSCC - Standard Microcircuit
Drawing (SMD)
Radiation data available
MSC-AMS level "S" processing available
+VIN
GROUND
RD
RT
CT
Reference
Regulator
Undervoltage
Lockout
Oscillator
To Internal SYNC
Circuitry
+VC
OUTPUT A
RESET
CSOFTSTART
COMPENSATION
+ ERROR
— ERROR
+ C.S.
— C.S.
Soft
Start
+VIN
Amp
S
S
Q
D
Q
RQ
MEMORY
F/F
METERING
F/F
Q
T
Q
TOGGLE
F/F
OUTPUT B
SHUTDOWN
December 2014 Rev1.2
www.microsemi.com
© 2014 Microsemi Corporation
1


  Microsemi Electronic Components Datasheet  

SG3526 Datasheet

REGULATING PULSE WIDTH MODULATOR

No Preview Available !

ABSOLUTE MAXIMUM RATINGSte 1)
Input Voltage (VIN) ............................................................... 40V
Collector Supply Voltage (VC) ............................................. 40V
Logic Inputs ......................................................... -0.3V to 5.5V
Analog Inputs .......................................................... -0.3V to VIN
Source/Sink Load Current (each output) ....................... 200mA
Reference Load Current .................................................. 50mA
Note 1. Exceeding these ratings could cause damage to the device.
Logic Sink Current ............................................................ 15mA
Operating Junction Temperature
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
RoHS Peak Package Solder Reflow Temp. (40 sec. max. exp.)...... 260°C (+0, -5)
THERMAL DATA
J Package:
Thermal Resistance-Junction to Case, θJC .................. 25°C/W
Thermal Resistance-Junction to Ambient, θJA .............. 70°C/W
N Package:
Thermal Resistance-Junction to Case, θJC .................. 30°C/W
Thermal Resistance-Junction to Ambient, θJA ............. 60°C/W
DW Package:
Thermal Resistance-Junction to Case, θJC .................. 35°C/W
Thermal Resistance-Junction to Ambient, θJA ............. 90°C/W
L Package:
Thermal Resistance-Junction to Case, θJC ................... 35°C/W
Thermal Resistance-Junction to Ambient, θJA ........... 120°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 ............................................................. 8V to 35V
Collector Supply Voltage ........................................ 4.5V to 35V
Sink/Source Load Current (each output) ................ 0 to 100mA
Reference Load Current ........................................... 0 to 20mA
Oscillator Frequency Range .............................. 1Hz to 350kHz
Oscillator Timing Resistor .................................. 2kto 150k
Note 2. Range over which the device is functional.
Oscillator Timing Capacitor .................................... 1nF to 20µF
Available Deadtime Range at 40kHz ...................... 3% to 50%
Operating Ambient Temperature Range:
SG1526 ......................................................... -55°C to 125°C
SG2526 ........................................................... -25°C to 85°C
SG3526 ............................................................... 0°C to 70°C
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1526 with -55°C TA 125°C, SG2526 with
-25°C TA 85°C, SG3526 with 0°C TA 70°C, and VIN = 15V. Low duty cycle pulse testing techniques are used which maintains junction and case
temperatures equal to the ambient temperature.)
Parameter
Test Conditions
Reference Section (Note 3)
Output Voltage
TJ = 25°C
Line Regulation
VIN = 8 to 35V
Load Regulation
IL = 0 to 20mA
Temperature Stability (Note 9)
Over Operating TJ
Total Output Voltage Range (Note 9) Over Recommended Operating Conditions
Short Circuit Current
VREF = 0V
Undervoltage Lockout Section
RESET Output Voltage
RESET Output Voltage
VREF = 3.8V
VREF = 4.8V
SG1526/2526
SG3526
Units
Min. Typ. Max. Min. Typ. Max.
4.95 5.00 5.05 4.90 5.00 5.10
10 30
10 30
10 30
10 50
15 50
15 50
4.90 5.00 5.10 4.85 5.00 5.15
50 125
50 125
V
mV
mV
mV
V
mA
0.2 0.4
0.2 0.4
2.4 4.8
2.4 4.8
V
V
2


Part Number SG3526
Description REGULATING PULSE WIDTH MODULATOR
Maker Microsemi
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SG3526 Datasheet PDF






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