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UC3844B Datasheet

  • UC3844B

  • HIGH PERFORMANCE CURRENT MODE CONTROLLERS

  • 16頁

  • MOTOROLA   MOTOROLA

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Order this document by UC3844B/D
UC3844B, 45B
UC2844B, 45B
High Performance
Current Mode Controllers
The UC3844B, UC3845B series are high performance fixed frequency
current mode controllers. They are specifically designed for Off鈥揕ine and
dc鈥搕o鈥揹c converter applications offering the designer a cost鈥揺ffective
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鈥揵y鈥揷ycle current limiting,
a latch for single pulse metering, and a flip鈥揻lop 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鈥損in dual鈥搃n鈥搇ine and surface mount
(SO鈥?) plastic package as well as the 14鈥損in plastic surface mount (SO鈥?4).
The SO鈥?4 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鈥搇ine converters. The UCX845B is tailored for lower voltage
applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
鈥?/div>
Trimmed Oscillator for Precise Frequency Control
HIGH PERFORMANCE
CURRENT MODE
CONTROLLERS
N SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D1 SUFFIX
PLASTIC PACKAGE
CASE 751
(SO鈥?)
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO鈥?4)
8
1
14
1
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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鈥揃y鈥揅ycle Current Limiting
Internally Trimmed Reference with Undervoltage Lockout
High Current Totem Pole Output
Undervoltage Lockout with Hysteresis
Low Startup and Operating Current
Compensation
1
NC
2
Voltage Feedback
3
NC
4
Current Sense
5
NC
6
Compensation
1
Voltage Feedback
2
Current Sense
3
RT/CT
4
(Top View)
14
V
ref
13
NC
12
VCC
11
8
7
6
5
PIN CONNECTIONS
Vref
VCC
Output
Gnd
VC
Gnd
Power Ground
10
Output
9
8
Simplified Block Diagram
VCC
7(12)
RT/CT
7
(Top View)
Vref
8(14)
R
R
Vref
Undervoltage
Lockout
5.0V
Reference
VCC
Undervoltage
Lockout
ORDERING INFORMATION
Device
VC
7(11)
Output
6(10)
Power
Ground
5(8)
Operating
Temperature Range
Package
SO鈥?4
UC384XBD
UC384XBD1
UC384XBN
UC284XBD
UC284XBD1
UC284XBN
UC384XBVD
UC384XBVD1 TA = 鈥?40擄 to +105擄C
UC384XBVN
X indicates either a 4 or 5 to define specific device
part numbers.
漏
Motorola, Inc. 1996
TA = 0擄 to + 70擄C
SO鈥?
Plastic
SO鈥?4
RT/CT
4(7)
Voltage
Feedback
Input
Output/
Compensation
1(1)
Oscillator
Latching
PWM
TA = 鈥?25擄 to + 85擄C
SO鈥?
Plastic
SO鈥?4
SO鈥?
Plastic
2(3)
Error
Amplifier
3(5)
Gnd
5(9)
Current
Sense Input
Pin numbers in parenthesis are for the D suffix SO鈥?4 package.
Rev 1
MOTOROLA ANALOG IC DEVICE DATA
1

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