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  Microsemi Electronic Components Datasheet  

SG1526B Datasheet

REGULATING PULSE WIDTH MODULATOR

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SG1526B/SG2526B/SG3526B
REGULATING PULSE WIDTH MODULATOR
DESCRIPTION
The SG1526B is a high-performance pulse width modulator
for switching power supplies which offers improved
functional and electrical characteristics over the industry-
standard SG1526. A direct pin-for-pin replacement for the
earlier device with all its features, it incorporates the
following enhancements: a bandgap reference circuit for
improved regulation and drift characteristics, improved
undervoltage lockout, lower temperature coefficients on
oscillator frequency and current-sense threshold, tighter
tolerance on softstart time, much faster SHUTDOWN
response, improved double-pulse supperession logic for
higher speed operation, and an improved output driver
design with low shoot-through current, and faster rise and
fall times. This versatile device can be used to implement
single-ended or push-pull switching regulators of either
polarity, both transformerless and transformer-coupled. The
SG1526B is specified for operation over the full military
ambient temperature range of -55°C to 150°C. The
SG2526B is characterized for the industrial range of -25°C
to 150°C, and the SG3526B is designed for the commercial
range of 0°C to 125°C.
BLOCK DIAGRAM
FEATURES
8V to 35V Operation
5V Low drift 1% Bandgap Reference
1Hz to 500kHz Oscillator Range
Dual 100mA Source/Sink
Digital Current Limiting
Double Pulse Suppression
Programmable Deadtime
Improved 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
Shoot-through Currents Less than 100mA
Improved Shutdown Delay
Improved Rise and Fall Time
HIGH RELIABILITY FEATURES
Available To MIL-STD-883, ¶ 1.2.1
Available to DSCC - Standard Microcircuit
Drawing (SMD)
MIL-M38510/12603BVA - SG1526BJ-JAN
Radiation data available
MSC-AMS Level "S" Processing Available
VREF
+VIN
GROUND
RD
RT
CT
Reference
Regulator
Undervoltage
Lockout
Oscillator
To Internal
Circuitry
SYNC
+VC
OUTPUT A
RESET
CSOFTSTART
COMPENSATION
+ ERROR
— ERROR
+ C.S.
— C.S.
Soft
Start
+VIN
Amp
S
Q
D
Q
S
RQ
MEMORY
F/F
Q
T
Q
TOGGLE
F/F
METERING
F/F
OUTPUT B
SHUTDOWN
December 2014 Rev1.2
www.microsemi.com
© 2014 Microsemi Corporation
1


  Microsemi Electronic Components Datasheet  

SG1526B Datasheet

REGULATING PULSE WIDTH MODULATOR

No Preview Available !

ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage (V ) ............................................................... 40V
IN
Collector Supply Voltage (VC) ............................................. 40V
Logic Inputs ......................................................... -0.3V to 5.5V
Analog Inputs .......................................................... -0.3V to V
IN
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 500kHz
Oscillator Timing Resistor .................................. 2kto 150k
Note 2. Range over which the device is functional.
Oscillator Timing Capacitor ............................... 470pF to 20µF
Available Deadtime Range at 40kHz ...................... 5% to 50%
Operating Junction Temperature Range:
SG1526B ....................................................... -55°C to 125°C
SG2526B ......................................................... -25°C to 85°C
SG3526B ............................................................ 0°C to 70°C
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1526B with -55°C TA 125°C, SG2526B with
-25°C TA 85°C, SG3526B 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
Reference Section (Note 3)
Output Voltage
Line Regulation
Load Regulation
Temperature Stability (Note 9)
Total Output Voltage Range (Note 9)
Short Circuit Current
Undervoltage Lockout Section
RESET Output Voltage
RESET Output Voltage
Test Conditions
TJ = 25°C
V = 8 to 35V
IN
IL = 0 to 20mA
Over Operating TJ
VREF = 0V
VREF = 3.8V
VREF = 4.8V
SG1526B/2526B SG3526B
Min. Typ. Max. Min. Typ. Max.
Units
4.95 5.00 5.05 4.90 5.00 5.10
7 10
10 20
10 20
10 25
15 50
15 50
4.90 5.00 5.10 4.85 5.00 5.15
25 50 125 25 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 SG1526B
Description REGULATING PULSE WIDTH MODULATOR
Maker Microsemi
PDF Download

SG1526B Datasheet PDF






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