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MC44602 Datasheet(PDF) 1 Page - Motorola, Inc

Part No. MC44602
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLER
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC44602 Datasheet(HTML) 1 Page - Motorola, Inc

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MC44602
SEMICONDUCTOR
TECHNICAL DATA
HIGH PERFORMANCE
CURRENT MODE
CONTROLLER
PIN CONNECTIONS
Order this document by MC44602/D
P2 SUFFIX
PLASTIC PACKAGE
CASE 648C
DIP (12 + 2 + 2)
16
1
(Top View)
Compensation
Load Detect Input
Voltage Feedback Input
Sink Gnd
Current Sense Input
Sync Input
RT/CT
Vref
VCC
Sink Gnd
Source Output
Gnd
VC
Sink Output
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
Device
Operating
Temperature Range
Package
ORDERING INFORMATION
MC44602
TA = – 25 to 85°C
DIP (12 + 2 + 2)
1
MOTOROLA ANALOG IC DEVICE DATA
High Performance
Current Mode Controller
The MC44602 is an enhanced high performance fixed frequency current
mode controller that is specifically designed for off–line and high voltage
dc–to–dc converter applications. This device has the unique ability of
changing operating modes if the converter output is overloaded or shorted,
offering the designer additional protection for increased system reliability.
The MC44602 has several distinguishing features when compared to
conventional current mode controllers. These features consist of a foldback
amplifier for overload detection, valid load and demag comparators with a
fault latch for short circuit detection, thermal shutdown, and separate high
current source and sink outputs that are ideally suited for driving a high
voltage bipolar power transistor, such as the MJE18002, MJE18004, or
MJE18006.
Standard features include an oscillator with a sync input, a temperature
compensated reference, high gain error amplifier, and a current sensing
comparator. Protective features consist of input and reference undervoltage
lockouts each with hysteresis, cycle–by–cycle current limiting, a latch for
single pulse metering, and a flip–flop which blanks the output off every other
oscillator cycle, allowing output deadtimes to be programmed from 50% to
70%. This device is manufactured in a 16 pin dual–in–line heat tab package
for improved thermal conduction.
Separate High Current Source and Sink Outputs Ideally Suited for
Driving Bipolar Power Transistors: 1.0 A Source, 1.5 A Sink
Unique Overload and Short Circuit Protection
Thermal Protection
Oscillator with Sync Input
Current Mode Operation to 500 kHz Output Switching Frequency
Output Deadtime Adjustable from 50% to 70%
Automatic Feed Forward Compensation
Latching PWM for Cycle–By–Cycle Current Limiting
Input and Reference Undervoltage Lockouts with Hysteresis
Low Startup and Operating Current
Simplified Block Diagram
Error
Amplifier
Foldback
Amplifier
16
Vref
7
Sync Input
8
RT/CT
1
Compensation
3
Voltage Feedback–Input
Vref
Undervoltage
Lockout
5.0V
Reference
VCC
Undervoltage
Lockout
Short Circuit
Detection
Oscillator
Flip Flop
and
Latching
PWM
Thermal
Gnd
9
15
VCC
2
11
6
Load Detect Input
14
VC
Source Output
10
Sink Output
4, 5, 12, 13
Sink Ground
Current Sense Input
© Motorola, Inc. 1996
Rev 0


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