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Motorola Semiconductors - (UC3842B / UC3843B) HIGH PERFORMANCE CURRENT MODE CONTROLLERS

Numéro de référence UC3843B
Description (UC3842B / UC3843B) HIGH PERFORMANCE CURRENT MODE CONTROLLERS
Fabricant Motorola Semiconductors 
Logo Motorola Semiconductors 





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UC3843B fiche technique
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Order this document by UC3842B/D
UC3842B, 43B
UC2842B, 43B
High Performance
Current Mode Controllers
The UC3842B, UC3843B series are high performance fixed frequency
current mode controllers. They 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 and surface mount
(SO–8) 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 UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally
suited for off–line converters. The UCX843B is tailored for lower voltage
applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
Trimmed Oscillator for Precise Frequency Control
Oscillator Frequency Guaranteed at 250 kHz
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
Simplified Block Diagram
VCC 7(12)
Vref
8(14) R
5.0V
Reference
R
Vref
Undervoltage
Lockout
RT/CT
Oscillator
4(7)
Voltage
Feedback
+
Input
2(3) Error
Output
Amplifier
Compensation
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Gnd 5(9)
Latching
PWM
VCC
Undervoltage
Lockout
Pin numbers in parenthesis are for the D suffix SO–14 package.
VC
7(11)
Output
6(10)
Power
Ground
5(8)
Current
Sense
3(5) Input
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
N SUFFIX
PLASTIC PACKAGE
CASE 626
D1 SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
8
1
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
14
1
PIN CONNECTIONS
Compensation 1
Voltage Feedback 2
Current Sense 3
RT/CT 4
8 Vref
7 VCC
6 Output
5 Gnd
(Top View)
Compensation 1
NC 2
Voltage Feedback 3
NC 4
Current Sense 5
NC 6
RT/CT 7
14 Vref
13 NC
12 VCC
11 VC
10 Output
9 Gnd
8 Power Ground
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range Package
UC384XBD
SO–14
UC384XBD1
UC384XBN
TA = 0° to +70°C
SO–8
Plastic
UC284XBD
SO–14
UC284XBD1 TA = – 25° to +85°C
UC284XBN
SO–8
Plastic
UC384XBVD
SO–14
UC384XBVD1 TA = – 40° to +105°C
UC384XBVN
SO–8
Plastic
X indicates either a 2 or 3 to define specific device part
numbers.
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 1
1

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