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UC3842A Datasheet(PDF) 1 Page - ON Semiconductor

Part No. UC3842A
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC3842A Datasheet(HTML) 1 Page - ON Semiconductor

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Device
Operating
Temperature Range
Package
UC3842A, 43A
UC2842A, 43A
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
ORDERING INFORMATION
UC3842AD
UC3843AD
TA = 0° to +70°C
TA = – 25° to +85°C
SO–14
SO–14
PIN CONNECTIONS
Order this document by UC3842A/D
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
N SUFFIX
PLASTIC PACKAGE
CASE 626
1
8
1
14
(Top View)
Vref
(Top View)
Compensation
Voltage Feedback
Current Sense
RT/CT
Vref
VCC
Output
Gnd
1
2
3
45
6
7
8
Compensation
NC
Voltage Feedback
NC
Current Sense
NC
RT/CT
NC
VCC
VC
Output
Gnd
Power Ground
1
2
3
4
5
6
7
9
8
10
11
12
13
14
UC3842AN
UC3843AN
Plastic
Plastic
UC2842AD
UC2843AD
SO–14
SO–14
UC2842AN
UC2843AN
Plastic
Plastic
1
MOTOROLA ANALOG IC DEVICE DATA
High Performance
Current Mode Controllers
The UC3842A, UC3843A series of high performance fixed frequency
current mode controllers are specifically designed for off–line and dc–to–dc
converter applications offering the designer a cost effective solution with
minimal external components. These integrated circuits feature a trimmed
oscillator for precise duty cycle control, a temperature compensated
reference, high gain error amplifier, current sensing comparator, and a high
current totem pole output ideally suited for driving a power MOSFET.
Also included are protective features consisting of input and reference
undervoltage lockouts each with hysteresis, cycle–by–cycle current limiting,
programmable output deadtime, and a latch for single pulse metering.
These devices are available in an 8–pin dual–in–line plastic package as
well as the 14–pin plastic surface mount (SO–14). The SO–14 package has
separate power and ground pins for the totem pole output stage.
The UCX842A has UYLO thresholds of 16 V (on) and 10 V (off), ideally
suited for off–line converters. The UCX843A is tailored for lower voltage
applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
Trimmed Oscillator Discharge Current for Precise Duty Cycle Control
Current Mode Operation to 500 kHz
Automatic Feed Forward Compensation
Latching PWM for Cycle–By–Cycle Current Limiting
Internally Trimmed Reference with Undervoltage Lockout
High Current Totem Pole Output
Undervoltage Lockout with Hysteresis
Low Startup and Operating Current
Direct Interface with Motorola SENSEFET Products
Simplified Block Diagram
5.0V
Reference
Latching
PWM
VCC
Undervoltage
Lockout
Oscillator
Error
Amplifier
7(12)
VC
7(11)
Output
6(10)
Power
Ground
5(8)
3(5)
Current
Sense
Input
Vref
8(14)
4(7)
2(3)
1(1)
Gnd
5(9)
RTCT
Voltage
Feedback
Input
R
R
+
Vref
Undervoltage
Lockout
Output
Compensation
Pin numbers in parenthesis are for the D suffix SO–14 package.
VCC
© Motorola, Inc. 1996
Rev 1


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