SG3526B MICROSEMI [Microsemi Corporation], SG3526B Datasheet

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SG3526B

Manufacturer Part Number
SG3526B
Description
REGULATING PULSE WIDTH MODULATOR
Manufacturer
MICROSEMI [Microsemi Corporation]
Datasheet

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4/90 Rev 1.1 2/94
Copyright
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.
BLOCK DIAGRAM
COMPENSATION
1994
C
— ERROR
SOFTSTART
+ ERROR
GROUND
RESET
— C.S.
+ C.S.
+V
R
R
C
IN
D
T
T
Amp
Start
Reference
Soft
Regulator
+V
Oscillator
IN
To Internal
Circuitry
V
REF
REGULATING PULSE WIDTH MODULATOR
SHUTDOWN
Undervoltage
Lockout
SYNC
METERING
D
F/F
S
1
Q
Q
MEMORY
S
R
F/F
Q
SG1526B/SG2526B/SG3526B
TOGGLE
FEATURES
HIGH RELIABILITY FEATURES - SG1526B
T
F/F
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
Available to MIL-STD-883
MIL-M38510/12603BVA - JAN1526BJ
Radiation data available
LMI level "S" processing available
Q
Q
11861 Western Avenue
L
INFINITY Microelectronics Inc.
(714) 898-8121
+V
C
Garden Grove, CA 92841
OUTPUT A
OUTPUT B
FAX: (714) 893-2570

Related parts for SG3526B

SG3526B Summary of contents

Page 1

... The SG1526B is specified for operation over the full military ambient temperature range of - 150 C. The SG2526B is characterized for the industrial range of - 150 C, and the SG3526B is designed for the commercial range 125 C. BLOCK DIAGRAM ...

Page 2

... Oscillator Timing Resistor .................................. Note 2. Range over which the device is functional. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1526B with - - SG3526B with case temperatures equal to the ambient temperature.) Parameter Reference Section (Note 3) ...

Page 3

... 1000pF 1000pF L SHUTDOWN = 0.4V Note . Note Note 9. These parameters, although guaranteed over the recom- mended operating conditions, are not tested in production. 3 SG1526B/SG2526B/SG3526B SG3526B SG1526B/2526B Min. Typ. Max. Min. Typ. Max 0.5 1.0 0 1.0 500 500 2.5 3.0 3.5 2 ...

Page 4

... CHARACTERISTIC CURVES FIGURE 1. REFERENCE VOLTAGE VS. SUPPLY VOLTAGE FIGURE 4. REFERENCE RIPPLE REJECTION FIGURE 7. SOFTSTART TIME CONSTANT VS 4/90 Rev 1.1 2/94 Copyright 1994 SG1526B/SG2526B/SG3526B FIGURE 2. REFERENCE TEMPERATURE STABILITY FIGURE 5. UNDER VOLTAGE LOCKOUT FIGURE 8. CURRENT LIMIT TRANSFER FUNCTION 4 FIGURE 3. REFERENCE SHORT CIRCUIT FIGURE 6. ERROR AMPLIFIER OPEN LOOP GAIN VS ...

Page 5

... CHARACTERISTIC CURVES (continued) FIGURE 10. STANDBY CURRENT VS. SUPPLY VOLTAGE FIGURE 13. SUPPLY CURRENT VS. OUTPUT FREQUENCY FIGURE 16. OSCILLATOR FREQUENCY TEMPERATURE STABILITY 4/90 Rev 1.1 2/94 Copyright 1994 SG1526B/SG2526B/SG3526B FIGURE 11. OUTPUT DRIVER DEADTIME VS. C VALUE T FIGURE 14. SUPPLY CURRENT VS. OUTPUT FREQUENCY FIGURE 17. OUTPUT DRIVER SATURATION VOLTAGE 5 FIGURE 12. OUTPUT DRIVER DEADTIME VS. R ...

Page 6

... C. When the BE to the PWM is removed clamps the error the soft-start voltage ramps SG1526B/SG2526B/SG3526B FIGURE 20. EXTENDING REFERENCE OUTPUT CURRENT FIGURE 21. SIMPLIFIED UNDERVOLTAGE LOCKOUT FIGURE 22. SOFT-START CIRCUIT SCHEMATIC L INFINITY Microelectronics Inc. 11861 Western Avenue Garden Grove, CA 92841 ...

Page 7

... Slave R grounded. terminal is the same as the FIGURE 24. OSCILLATOR CONNECTIONS ANDD WAVEFORMS FIGURE 25. ERROR AMPLIFIER CONNECTIONS 7 SG1526B/SG2526B/SG3526B terminals are connected to the terminals should not T terminals may be either left open or D (A) (B) L INFINITY Microelectronics Inc ...

Page 8

... Copyright 1994 (continued) or from the +V voltage at these outputs as a function of load current are found in Figure 17. FIGURE 27. SINGLE-ENDED CONFIGURATION 8 SG1526B/SG2526B/SG3526B pin, as required. Curves for the saturation C FIGURE 28. DRIVING N-CHANNEL POWER MOSFETS L INFINITY Microelectronics Inc. 11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 ...

Page 9

... LEADLESS CHIP CARRIER SG1526BL L- PACKAGE Note 1. Contact factory for JAN and DESC product availability. 2. All parts are viewed from the top. 4/90 Rev 1.1 2/94 Copyright 1994 SG1526B/SG2526B/SG3526B (See Notes Below) Ambient Connection Diagram Temperature Range - 125 C - 125 C - 125 C ...

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