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UC284XBD Fiches technique(PDF) 1 Page - Motorola, Inc

No de pièce UC284XBD
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Fabricant  MOTOROLA [Motorola, Inc]
Site Internet  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

UC284XBD Fiches technique(HTML) 1 Page - Motorola, Inc

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D1 SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
N SUFFIX
PLASTIC PACKAGE
CASE 626
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
8
1
14
1
8
1
UC3844B, 45B
UC2844B, 45B
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
Order this document by UC3844B/D
14
13
12
11
1
2
3
4
10
9
8
5
6
7
Vref
NC
Compensation
NC
Voltage Feedback
NC
Current Sense
NC
RT/CT
VCC
VC
Output
Gnd
Power Ground
1
2
3
4
Vref
8
Compensation
Voltage Feedback
Current Sense
RT/CT
VCC
Output
Gnd
7
6
5
PIN CONNECTIONS
(Top View)
(Top View)
Plastic
SO–14
SO–8
SO–8
UC384XBD1
UC284XBD1
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
UC384XBD
TA = 0° to + 70°C
SO–14
UC284XBN
UC384XBVD
UC384XBVD1
SO–8
UC384XBVN
Plastic
TA = – 25° to + 85°C
SO–14
UC284XBD
UC384XBN
Plastic
TA = – 40° to +105°C
X indicates either a 4 or 5 to define specific device
part numbers.
1
MOTOROLA ANALOG IC DEVICE DATA
High Performance
Current Mode Controllers
The UC3844B, UC3845B 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
an oscillator, 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,
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%.
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 UCX844B has UVLO thresholds of 16 V (on) and 10 V (off), ideally
suited for off–line converters. The UCX845B 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 Output Switching Frequency
Output Deadtime Adjustable from 50% to 70%
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
Pin numbers in parenthesis are for the D suffix SO–14 package.
Output
VC
RT/CT
Vref
VCC
Undervoltage
Lockout
Gnd
5.0V
Reference
Vref
Undervoltage
Lockout
Latching
PWM
Oscillator
Error
Amplifier
5(9)
3(5)
5(8)
6(10)
7(11)
Power
Ground
Current
Sense Input
1(1)
2(3)
4(7)
8(14)
Output/
Compensation
Voltage
Feedback
Input
VCC
7(12)
R
R
© Motorola, Inc. 1996
Rev 1


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