Order this document by SG3526/D
SG3526
Pulse Width Modulation
Control Circuit
The SG3526 is a high performance pulse width modulator integrated
circuit intended for fixed frequency switching regulators and other power
control applications.
Functions included in this IC are a temperature compensated voltage
reference, sawtooth oscillator, error amplifier, pulse width modulator, pulse
metering and steering logic, and two high current totem pole outputs ideally
suited for driving the capacitance of power FETs at high speeds.
Additional protective features include soft start and undervoltage lockout,
digital current limiting, double pulse inhibit, adjustable dead time and a data
latch for single pulse metering. All digital control ports are TTL and B–series
CMOS compatible. Active low logic design allows easy wired–OR
connections for maximum flexibility. The versatility of this device enables
implementation in single–ended or push–pull switching regulators that are
transformerless or transformer coupled. The SG3526 is specified over a
junction temperature range of 0° to +125°C.
•
8.0 V to 35 V Operation
PULSE WIDTH MODULATION
CONTROL CIRCUIT
SEMICONDUCTOR
TECHNICAL DATA
18
1
•
•
•
•
•
•
•
•
•
•
5.0 V
±1%
Trimmed Reference
1.0 Hz to 400 kHz Oscillator Range
Dual Source/Sink Current Outputs:
±100
mA
Digital Current Limiting
Programmable Dead Time
Undervoltage Lockout
Single Pulse Metering
Programmable Soft–Start
Wide Current Limit Common Mode Range
Guaranteed 6 Unit Synchronization
N SUFFIX
PLASTIC PACKAGE
CASE 707
PIN CONNECTIONS
+Error
–Error
Compensation
1
2
3
4
5
6
7
8
9
(Top View)
18 Vref
17 VCC
16 Output B
15 Ground
14 VC
13 Output A
12 Sync
11 RDeadtime
10 CT
Representative Block Diagram
CSoft–Start
Vref
VCC
Ground
Sync
RDeadtime
RT
CT
Reset
CSoft–Start
18
17 Reference
Regulator
15
12
11
9 Oscillator
10
Under–
Voltage
Lockout
To Internal
Circuitry
14
VC
13
Output
A
5
4
3
VCC
1
2
7
6
8
+
–
+
–
Amp
–
+
SQ
D
Q
Soft
Start
Memory
F/F
S
RQ
Toggle
F/F
Q
T
Q
16
Output
B
Reset
–CS
+CS
Shutdown
RT
Compensation
+Error
–Error
+C.S.
–C.S.
Shutdown
ORDERING INFORMATION
Device
SG3526N
Operating
Temperature Range
TJ = 0° to +125°C
Package
Plastic DIP
Rev 2
Metering
F/F
©
Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
1