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UC384XBD1 Datasheet

  • UC384XBD1

  • HIGH PERFORMANCE CURRENT MODE CONTROLLERS

  • 16頁

  • ONSEMI

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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
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鈥揵y鈥揷ycle current limiting,
programmable output deadtime, and a latch for single pulse metering.
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 UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally
suited for off鈥搇ine converters. The UCX843B 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
D1 SUFFIX
PLASTIC PACKAGE
CASE 751
(SO鈥?)
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO鈥?4)
8
1
8
1
14
1
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
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
NC
Voltage Feedback
NC
Current Sense
NC
RT/CT
1
2
3
4
5
6
7
PIN CONNECTIONS
Compensation
Voltage Feedback
Current Sense
RT/CT
1
2
3
4
8
7
6
5
Vref
VCC
Output
Gnd
(Top View)
14
13
12
11
10
9
8
Simplified Block Diagram
VCC
Vref
8(14)
R
R
RT/CT
4(7)
Voltage
Feedback
Input
2(3)
Output
Compensation
1(1)
+
鈥?/div>
7(12)
Vref
NC
VCC
VC
Output
Gnd
Power Ground
(Top View)
5.0V
Reference
Vref
Undervoltage
Lockout
Oscillator
Latching
PWM
Error
Amplifier
6(10)
Power
Ground
5(8)
Current
Sense
3(5) Input
Gnd
5(9)
VCC
Undervoltage
Lockout
VC
7(11)
Output
ORDERING INFORMATION
Operating
Device
Temperature Range
UC384XBD
UC384XBD1
TA = 0擄 to +70擄C
UC384XBN
UC284XBD
TA = 鈥?25擄 to +85擄C
UC284XBD1
UC284XBN
UC384XBVD
UC384XBVD1 TA = 鈥?40擄 to +105擄C
UC384XBVN
Package
SO鈥?4
SO鈥?
Plastic
SO鈥?4
SO鈥?
Plastic
SO鈥?4
SO鈥?
Plastic
Pin numbers in parenthesis are for the D suffix SO鈥?4 package.
X indicates either a 2 or 3 to define specific device part
numbers.
漏
Motorola, Inc. 1996
Rev 1
MOTOROLA ANALOG IC DEVICE DATA
1

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