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JAN1526BJ

REGULATING PULSE WIDTH MODULATOR


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JAN1526BJ pdf
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 characteris-
tics over the industry-standard SG1526. A direct pin-for-pin replacement for
the earlier device with all its features, it incorporates the following enhance-
ments: a bandgap reference circuit for improved regulation and drift
characteristics, improved undervoltage lockout, lower temperature coeffi-
cients on oscillator frequency and current-sense threshold, tighter toler-
ance on softstart time, much faster SHUTDOWN response, improved
double-pulse supperession logic for higher speed operation, and an im-
proved 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 transformer-less
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.
FEATURES
8 to 35 volt 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 thru currents less than 100mA
Improved shutdown delay
Improved rise and fall time
HIGH RELIABILITY FEATURES - SG1526B
Available to MIL-STD-883
MIL-M38510/12603BVA - JAN1526BJ
Radiation data available
LMI level "S" processing available
BLOCK DIAGRAM
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
4/90 Rev 1.1 2/94
Copyright © 1994
LINFINITY Microelectronics Inc.
11861 Western Avenue Garden Grove, CA 92841
1 (714) 898-8121 FAX: (714) 893-2570



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JAN1526BJ pdf
ABSOLUTE MAXIMUM RATINGS (Note 1) (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.
SG1526B/SG2526B/SG3526B
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
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
4/90 Rev 1.1 2/94
Copyright © 1994
LINFINITY Microelectronics Inc.
11861 Western Avenue Garden Grove, CA 92841
2 (714) 898-8121 FAX: (714) 893-2570



Part Number JAN1526BJ
Description REGULATING PULSE WIDTH MODULATOR
Maker Microsemi Corporation - Microsemi Corporation
Total Page 9 Pages
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